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#5732 From: "wireless.radio" <happydayradio@...>
Date: Sat Aug 2, 2008 8:14 am
Subject:: [LPFM] Re: Low Power FM Power Increase Delays - Attention Alan Little
wireless.radio
Offline Offline
Send Email Send Email
 
In the last communications I had with RSM, they suggested to me that
there was still a lot of work to be done before 87.5 - 88.1 can be
opened up.
There are still land mobile users operating in the A band group of
frequencies which extends up to 87 MHz.
Talk at the time was that the lower end of the band would possibly
have an EIRP limit of 5 watts, with the top end of the band limited to
1 watt.
There's obviously a fair bit of work to still be done, and any work in
this area obviously doesn't generate revenue for RSM, so I'd say it
gets a fairly low priority.


--- In LPFM_Radio@..., "Ross Levis" <ross@...> wrote:
>
> It is good to know there is some progress towards 1 watt LPFM.  But what
> some are asking is will this increase in power come with further
> restrictions such as antenna height above the surrounding area,
which was
> being considered by RSM at some stage.  If so then many of us will
be better
> off with our current half watt.
>
>
>
> Auckland in particular is mostly looking forward to the 87.5 to ~88.3
> guardband change to happen as soon as possible.  Presumably this
will all
> happen at the same time.
>
>
>
> Ross.
>
>
>
> From: LPFM_Radio@...
[mailto:LPFM_Radio@...]
> On Behalf Of Allen Little
> Sent: Thursday, 31 July 2008 6:13 p.m.
> To: David Robinson
> Cc: Jeff Hicks
> Subject: [LPFM] Re: Low Power FM Power Increase Delays - Attention Alan
> Little
>
>
>
> Dear David,
>
> many thanks for this very well considered elaboration of the minutiae in
> spectrum planning for LPFM Power increase and Frequency changes.
>
> It has been suggested, that this might well become an election
issue, having
> regard to the fact Low Power FM Broadcasters are probably the only
> significant local radio stations in their communities of interest. Many
> operators are known to be displeased at the apparent lack of progress
> towards announced intentions.
>
> I will communicate these matters to various interested LPFM
operators and
> know you will continue to pursue the matter.  All concerned eagerly
await
> the Gazette Notice and clear indication of progress towards
implementation
> of this Government Policy.
>
> Please do keep me informed of progress and lets know any way I can be of
> assistance.
>
> All the very best.
>
> Sincerely
>
> Allen
>
>
>
> Allen  J Little QSM,JP
> 7 Earl Street              Res Ph (06) 367-5900
> Levin 5510                Mobile (021) 025-33-330
>
>
>
> Email:-   vision@...
> ------------------------------------------------------------------
>
>
>
> ----- Original Message -----
>
> From: David Robinson <mailto:David.Robinson@...>
>
> To: vision@...
>
> Cc: Jeff Hicks <mailto:Jeff.Hicks@...>
>
> Sent: Thursday, July 31, 2008 10:53 AM
>
> Subject: Low Power FM Power Increase Delays - Attention Alan Little
>
>
>
> Dear Alan,
>
>
>
> Further to your recent telcon with Jeff Hicks on the current delays
with the
> power increase to one watt for Low Power FM broadcast services
please note
> the following.
>
>
>
> The introduction of high powered FMBC services above 100 MHz that
started in
> 2001 meant a need for changes to our licence engineering processes by
> inclusion of coordination calculations between those services with
> aeronautical radio navigation aids in the band 108 to 117.95 MHz.
> Discussion of these requirements was included in the technical monograph
> "TM2001/003 Review of FMBC and aeronautical coordination Issues"
which has
> been available on the RSM web site for sometime.  That document
notes that
> the potential for high powered FM stations to cause harmful interference
> into aeronautical receivers used for Instrument Landing Systems and
Variable
> OmniRange Systems and cause significant operational issues for
aeroplanes
> during landing approaches during poor weather and at night.  In some
> circumstances the loss of these facilities due to harmful
interference can
> result in real safety of life incidents.
>
>
>
> To enable the safe operation of these aeronautical services
calculations are
> completed in accordance with ITU-R Recommendation SM.1009.  Those
> calculations include the determination of signal levels for all FMBC
> services at navigational receivers in aeroplanes, including signal
levels
> for low power FM services above 106.6 MHz and located within several
> kilometres or so of an aeroplane using the navigational systems .
>
>
>
> The current planning being undertaking within our Ministry for the
roll-over
> of high powered FM services licences in 2011 includes the frequency
> reassignment of many current stations to provide improved FM
reception and
> additional spectrum capacity for new stations.  This planning has taken
> longer than expected and delayed the calculations necessary for the
proper
> coordination of the low powered FM services with the aeronautical
> navigational services.  The recent auction of those new licences
will, we
> expect, mean the end of significant frequency changes and that we
can now
> finalise those coordination processes.
>
>
>
> I have recently taken delivery of the necessary calculations for
Auckland,
> Wellington, Christchurch and Dunedin, and plan to review these to
ensure all
> recent frequency changes are included.  Once this is completed there
will be
> calculations required for services adjacent to regional airfields
before we
> can finalise areas where use of low powered FM services must be
restricted.
> (Such areas are likely to be close to major and regional aerodromes.)
>
>
>
> It is currently planned to finalise all calculations and publish a
revised
> Low Power FM General User Licence prior to November 2008.
>
>
>
> The delay to the publication of the new low powered FM General User
Licence
> is regretted.
>
>
>
> Yours sincerely,
>
>
>
> David
>
> David Robinson | Senior Engineer, Operational Policy and International
> Relations | Radio Spectrum Management and Energy Safety Group
> Ministry of Economic Development
> PO Box 1473, Wellington 6140, New Zealand
> Free Phone 0508 RSM INFO (776 4636) or 0508 ESS INFO (377 4636) |
DDI +64 4
> 474 2866 | Fax +64 4 978 3162
> Visit our website:  <http://www.rsm.govt.nz/> www.rsm.govt.nz or
> <http://www.energysafety.govt.nz/> www.energysafety.govt.nz
> Subscribe to  <http://news.business.govt.nz/> Business Update for
our free
> <http://news.business.govt.nz/news/info/rsm/> electronic newsletter
>
>
>
> Subscribe to our e-newsletter
> To keep business updated on our work, the Ministry publishes a monthly
> electronic newsletter.
> To subscribe to this free newsletter see  <http://news.business.govt.nz>
> http://news.business.govt.nz
>
>
>
> newzealand.govt.nz <http://www.newzealand.govt.nz/>  - connecting
you to New
> Zealand central & local government services
>
>
>   _____
>
>
> Any opinions expressed in this message are not necessarily those of the
> Ministry of Economic Development. This message and any files transmitted
> with it are confidential and solely for the use of the intended
recipient.
> If you are not the intended recipient or the person responsible for
delivery
> to the intended recipient, be advised that you have received this
message in
> error and that any use is strictly prohibited. Please contact the
sender and
> delete the message and any attachment from your computer.
>
>
>   _____
>

#5731 From: "Ross Levis" <ross@...>
Date: Thu Jul 31, 2008 9:42 am
Subject:: RE: [LPFM] Re: Low Power FM Power Increase Delays - Attention Alan Little
rosslevis
Offline Offline
Send Email Send Email
 

It is good to know there is some progress towards 1 watt LPFM.  But what some are asking is will this increase in power come with further restrictions such as antenna height above the surrounding area, which was being considered by RSM at some stage.  If so then many of us will be better off with our current half watt.

 

Auckland in particular is mostly looking forward to the 87.5 to ~88.3 guardband change to happen as soon as possible.  Presumably this will all happen at the same time.

 

Ross.

 

From: LPFM_Radio@... [mailto:LPFM_Radio@...] On Behalf Of Allen Little
Sent: Thursday, 31 July 2008 6:13 p.m.
To: David Robinson
Cc: Jeff Hicks
Subject: [LPFM] Re: Low Power FM Power Increase Delays - Attention Alan Little

 

Dear David,

many thanks for this very well considered elaboration of the minutiae in spectrum planning for LPFM Power increase and Frequency changes. 

It has been suggested, that this might well become an election issue, having regard to the fact Low Power FM Broadcasters are probably the only significant local radio stations in their communities of interest. Many operators are known to be displeased at the apparent lack of progress towards announced intentions. 

I will communicate these matters to various interested LPFM operators and know you will continue to pursue the matter.  All concerned eagerly await the Gazette Notice and clear indication of progress towards implementation of this Government Policy.

Please do keep me informed of progress and lets know any way I can be of assistance.

All the very best.

Sincerely

Allen 

 

Allen  J Little QSM,JP                            
7 Earl Street              Res Ph (06) 367-5900
Levin 5510                Mobile (021) 025-33-330

 

Email:-   vision@...
------------------------------------------------------------------      

      

----- Original Message -----

Sent: Thursday, July 31, 2008 10:53 AM

Subject: Low Power FM Power Increase Delays - Attention Alan Little

 

Dear Alan,

 

Further to your recent telcon with Jeff Hicks on the current delays with the power increase to one watt for Low Power FM broadcast services please note the following.

 

The introduction of high powered FMBC services above 100 MHz that started in 2001 meant a need for changes to our licence engineering processes by inclusion of coordination calculations between those services with aeronautical radio navigation aids in the band 108 to 117.95 MHz.  Discussion of these requirements was included in the technical monograph "TM2001/003 Review of FMBC and aeronautical coordination Issues" which has been available on the RSM web site for sometime.  That document notes that the potential for high powered FM stations to cause harmful interference into aeronautical receivers used for Instrument Landing Systems and Variable OmniRange Systems and cause significant operational issues for aeroplanes during landing approaches during poor weather and at night.  In some circumstances the loss of these facilities due to harmful interference can result in real safety of life incidents.

 

To enable the safe operation of these aeronautical services calculations are completed in accordance with ITU-R Recommendation SM.1009.  Those calculations include the determination of signal levels for all FMBC services at navigational receivers in aeroplanes, including signal levels for low power FM services above 106.6 MHz and located within several kilometres or so of an aeroplane using the navigational systems .

 

The current planning being undertaking within our Ministry for the roll-over of high powered FM services licences in 2011 includes the frequency reassignment of many current stations to provide improved FM reception and additional spectrum capacity for new stations.  This planning has taken longer than expected and delayed the calculations necessary for the proper coordination of the low powered FM services with the aeronautical navigational services.  The recent auction of those new licences will, we expect, mean the end of significant frequency changes and that we can now finalise those coordination processes.

 

I have recently taken delivery of the necessary calculations for Auckland, Wellington, Christchurch and Dunedin, and plan to review these to ensure all recent frequency changes are included.  Once this is completed there will be calculations required for services adjacent to regional airfields before we can finalise areas where use of low powered FM services must be restricted.  (Such areas are likely to be close to major and regional aerodromes.)

 

It is currently planned to finalise all calculations and publish a revised Low Power FM General User Licence prior to November 2008.

 

The delay to the publication of the new low powered FM General User Licence is regretted.

 

Yours sincerely,

 

David

David Robinson | Senior Engineer, Operational Policy and International Relations | Radio Spectrum Management and Energy Safety Group
Ministry of Economic Development
PO Box 1473, Wellington 6140, New Zealand
Free Phone 0508 RSM INFO (776 4636) or 0508 ESS INFO (377 4636) | DDI +64 4 474 2866 | Fax +64 4 978 3162

Visit our website: www.rsm.govt.nz or www.energysafety.govt.nz
Subscribe to Business Update for our free electronic newsletter

 

Subscribe to our e-newsletter
To keep business updated on our work, the Ministry publishes a monthly electronic newsletter. 
To subscribe to this free newsletter see
http://news.business.govt.nz

 

newzealand.govt.nz - connecting you to New Zealand central & local government services


Any opinions expressed in this message are not necessarily those of the Ministry of Economic Development. This message and any files transmitted with it are confidential and solely for the use of the intended recipient. If you are not the intended recipient or the person responsible for delivery to the intended recipient, be advised that you have received this message in error and that any use is strictly prohibited. Please contact the sender and delete the message and any attachment from your computer.



#5730 From: "Allen Little" <vision@...>
Date: Thu Jul 31, 2008 6:12 am
Subject:: Re: Low Power FM Power Increase Delays - Attention Alan Little
kiwilittle
Offline Offline
Send Email Send Email
 
Dear David,
many thanks for this very well considered elaboration of the minutiae in spectrum planning for LPFM Power increase and Frequency changes. 
It has been suggested, that this might well become an election issue, having regard to the fact Low Power FM Broadcasters are probably the only significant local radio stations in their communities of interest. Many operators are known to be displeased at the apparent lack of progress towards announced intentions. 
I will communicate these matters to various interested LPFM operators and know you will continue to pursue the matter.  All concerned eagerly await the Gazette Notice and clear indication of progress towards implementation of this Government Policy.
Please do keep me informed of progress and lets know any way I can be of assistance.
All the very best.
Sincerely
Allen 
 
Allen  J Little QSM,JP                            
7 Earl Street              Res Ph (06) 367-5900
Levin 5510                Mobile (021) 025-33-330
 
Email:-   vision@...
------------------------------------------------------------------      
      
----- Original Message -----
Sent: Thursday, July 31, 2008 10:53 AM
Subject: Low Power FM Power Increase Delays - Attention Alan Little

Dear Alan,
 
Further to your recent telcon with Jeff Hicks on the current delays with the power increase to one watt for Low Power FM broadcast services please note the following.
 
The introduction of high powered FMBC services above 100 MHz that started in 2001 meant a need for changes to our licence engineering processes by inclusion of coordination calculations between those services with aeronautical radio navigation aids in the band 108 to 117.95 MHz.  Discussion of these requirements was included in the technical monograph "TM2001/003 Review of FMBC and aeronautical coordination Issues" which has been available on the RSM web site for sometime.  That document notes that the potential for high powered FM stations to cause harmful interference into aeronautical receivers used for Instrument Landing Systems and Variable OmniRange Systems and cause significant operational issues for aeroplanes during landing approaches during poor weather and at night.  In some circumstances the loss of these facilities due to harmful interference can result in real safety of life incidents.
 
To enable the safe operation of these aeronautical services calculations are completed in accordance with ITU-R Recommendation SM.1009.  Those calculations include the determination of signal levels for all FMBC services at navigational receivers in aeroplanes, including signal levels for low power FM services above 106.6 MHz and located within several kilometres or so of an aeroplane using the navigational systems .
 
The current planning being undertaking within our Ministry for the roll-over of high powered FM services licences in 2011 includes the frequency reassignment of many current stations to provide improved FM reception and additional spectrum capacity for new stations.  This planning has taken longer than expected and delayed the calculations necessary for the proper coordination of the low powered FM services with the aeronautical navigational services.  The recent auction of those new licences will, we expect, mean the end of significant frequency changes and that we can now finalise those coordination processes.
 
I have recently taken delivery of the necessary calculations for Auckland, Wellington, Christchurch and Dunedin, and plan to review these to ensure all recent frequency changes are included.  Once this is completed there will be calculations required for services adjacent to regional airfields before we can finalise areas where use of low powered FM services must be restricted.  (Such areas are likely to be close to major and regional aerodromes.)
 
It is currently planned to finalise all calculations and publish a revised Low Power FM General User Licence prior to November 2008.
 
The delay to the publication of the new low powered FM General User Licence is regretted.
 
Yours sincerely,
 
David

David Robinson | Senior Engineer, Operational Policy and International Relations | Radio Spectrum Management and Energy Safety Group
Ministry of Economic Development
PO Box 1473, Wellington 6140, New Zealand
Free Phone 0508 RSM INFO (776 4636) or 0508 ESS INFO (377 4636) | DDI +64 4 474 2866 | Fax +64 4 978 3162

Visit our website: www.rsm.govt.nz or www.energysafety.govt.nz
Subscribe to Business Update for our free electronic newsletter

 

Subscribe to our e-newsletter
To keep business updated on our work, the Ministry publishes a monthly electronic newsletter. 
To subscribe to this free newsletter see
http://news.business.govt.nz

 
newzealand.govt.nz - connecting you to New Zealand central & local government services


Any opinions expressed in this message are not necessarily those of the Ministry of Economic Development. This message and any files transmitted with it are confidential and solely for the use of the intended recipient. If you are not the intended recipient or the person responsible for delivery to the intended recipient, be advised that you have received this message in error and that any use is strictly prohibited. Please contact the sender and delete the message and any attachment from your computer.


#5729 From: "wireless.radio" <happydayradio@...>
Date: Sat Jul 26, 2008 5:16 am
Subject:: Re: digital STL testing on a shoe string results
wireless.radio
Offline Offline
Send Email Send Email
 
Very interesting there Gavin. FYI, I see there are some 20 W wifi
booster amps on Ebay. I know that power level isn't allowable here but
you could tune them down to suit.
With the lack of available 900 MHz frequencies for STLs and the
relevant cost of them, using the 2.4 GHz band makes good sense. If you
could end up with a frequency agile, channel locked system with
balanced inputs and outputs it would be a sure winner.

I'll watch this space.




--- In LPFM_Radio@..., "Gavin Stephens" <gstephens@...>
wrote:
>
> Hi guys,
>
> I thought I'd drop a line as I'd mentioned a while back I was going
to play with some digital audio sender devices in the 2.4GHz band for
STL ideas. Since digital modulated devices are allowed 4 Watts after
the antenna, not 1W like analogue.
>
> I bought a couple of cheap second hand DAS-100 units which has
www.elansat.com modules in them off trademe once. The module I use are
a small self contained 2.4GHz FSK transmitter, D/A and A/D TX/RX
respectively. The one I have encodes audio in to 16-bit 44,100Hz
stereo, 95dB SNR and range but unbalanced input. It's not a video
sender, but rather a dedicated digital audio sender. They take audio
up to around +4dBu (assume one drives them with a sound card up to 0
with 3-4 headroom for quantization errors).
>
> I had the privilledge of outputting one of these units in to a
21-24dB antenna (never have the TX antenna going with 2.4GHz close to
your body) at the TX and RX end, going on the default 10mW output,
over 3KM's non-line of site in a city from single level roof top with
antennas about 2-3 meters above roof line. While the signal unlocked
now and then at 10mW (and considering the antennas can't see each
other), the sound on them is terrific. A quick test with an older DSE
500mW Wi-Fi booster made it rock solid. However I'm looking at testing
a 100-200mW selectable Edimax booster soon for obvious RF power
reasons. I think the Hyper Technologies and Pacific Wireless 12dB mini
directional square antennas with high loss coax would be ideal.
>
> So my eventual experiment results are, even on 10mW TX output in to
a 21+dB antenna with another one on the receive end (probably about
8-10dB loss in cable, amazingly impressed me mucho grande! The great
part though.... the modules also use high quality "forward error
correction", I believe with this one (I lost my book on it) is 1/2,
bit for bit error correction. This compared to freeview satellite
delivery only being around 1 error correcting bit for every 3 (3/4).
The unit I tested and modified (just the on-board antenna and audio
inputs) has 8 channels to choose from.
>
> The newer modules and chips do away with selectable channels in
favour of frequency hoping instead with 48KHz A/D's and D/A's.
>
> Anyway errors weren't a problem working along around a high..ish
powered wireless ISP and numerous other WLANs in the area accept on
less than 10mW TX power. On the default channel the microwave at home
caused the RX to unlock but I know it works well on anything above the
default channel at home (I'm awaiting frequencies from manufacturer so
I can choose and map out better one). The only draw back is I haven't
figured out how to lock the RX on a channel. The channels are button
selectable on the TX and the RX auto tunes with diversity antennas
(all on board by default). Autotune not being a good idea although not
many people in NZ have "digital" audio senders.
>
> They are used in digital wireless audio headphones. The other boards
they do, have intergrated USB sound cards in the TX although the unit
I tested had 3.5mm stereo jacks with a D/A in the TX and a A/D
obviously in the receiver. (I promptly replaced the 3.5mm sockets as
they didn't take to many plug ins and plug outs before getting scratchy).
>
> All in all, while at one stage I liked SPDIF over analogue video
senders (unfortunatelly without error correction and limited to 1W
E.I.R.P), I'm now a big fan of forward error corrected digital audio
senders and modifying the internal antennas to go to a booster in
front of them.
>
> I plan on tidying up my little mucking around and putting everything
in steel project cases with selectable output power and hope to test
the TX with an Edimax booster. As soon as I can lay my hands on the
FHSS (frequency hoping spread spectrum) modules I'll get around to
posting more test results and I'm sure I'll be even more impressed
with it's stability.
>
> I'm gathering more information about where the best place to get the
boards or newer boards from to NZ is. However I haven't had a look at
the devices to see if the intergrated antennas are easily tapped on
the new ones. Will let you know again one day how more experiments
like this continue.
>
> Gavin.
>

#5728 From: Brian Gallagher <brianislay@...>
Date: Tue Jul 22, 2008 9:37 pm
Subject:: Re: [LPFM] digital STL testing on a shoe string results
brianislay
Offline Offline
Send Email Send Email
 

Thanks for all that data Gav and thanks for all the hard work.I will be interested in your further tests

Brian

--- On Tue, 22/7/08, Gavin Stephens <gstephens@...> wrote:

From: Gavin Stephens <gstephens@...>
Subject: [LPFM] digital STL testing on a shoe string results
To: LPFM_Radio@...
Received: Tuesday, 22 July, 2008, 11:03 PM

Hi guys,
 
I thought I'd drop a line as I'd mentioned a while back I was going to play with some digital audio sender devices in the 2.4GHz band for STL ideas. Since digital modulated devices are allowed 4 Watts after the antenna, not 1W like analogue.
 
I bought a couple of cheap second hand DAS-100 units which has www.elansat. com modules in them off trademe once. The module I use are a small self contained 2.4GHz FSK transmitter, D/A and A/D TX/RX respectively. The one I have encodes audio in to 16-bit 44,100Hz stereo, 95dB SNR and range but unbalanced input. It's not a video sender, but rather a dedicated digital audio sender. They take audio up to around +4dBu (assume one drives them with a sound card up to 0 with 3-4 headroom for quantization errors).
 
I had the privilledge of outputting one of these units in to a 21-24dB antenna (never have the TX antenna going with 2.4GHz close to your body) at the TX and RX end, going on the default 10mW output, over 3KM's non-line of site in a city from single level roof top with antennas about 2-3 meters above roof line. While the signal unlocked now and then at 10mW (and considering the antennas can't see each other), the sound on them is terrific. A quick test with an older DSE 500mW Wi-Fi booster made it rock solid. However I'm looking at testing a 100-200mW selectable Edimax booster soon for obvious RF power reasons. I think the Hyper Technologies and Pacific Wireless 12dB mini directional square antennas with high loss coax would be ideal.
 
So my eventual experiment results are, even on 10mW TX output in to a 21+dB antenna with another one on the receive end (probably about 8-10dB loss in cable, amazingly impressed me mucho grande! The great part though.... the modules also use high quality "forward error correction", I believe with this one (I lost my book on it) is 1/2, bit for bit error correction. This compared to freeview satellite delivery only being around 1 error correcting bit for every 3 (3/4). The unit I tested and modified (just the on-board antenna and audio inputs) has 8 channels to choose from.
 
The newer modules and chips do away with selectable channels in favour of frequency hoping instead with 48KHz A/D's and D/A's.
 
Anyway errors weren't a problem working along around a high..ish powered wireless ISP and numerous other WLANs in the area accept on less than 10mW TX power. On the default channel the microwave at home caused the RX to unlock but I know it works well on anything above the default channel at home (I'm awaiting frequencies from manufacturer so I can choose and map out better one). The only draw back is I haven't figured out how to lock the RX on a channel. The channels are button selectable on the TX and the RX auto tunes with diversity antennas (all on board by default). Autotune not being a good idea although not many people in NZ have "digital" audio senders.
 
They are used in digital wireless audio headphones. The other boards they do, have intergrated USB sound cards in the TX although the unit I tested had 3.5mm stereo jacks with a D/A in the TX and a A/D obviously in the receiver. (I promptly replaced the 3.5mm sockets as they didn't take to many plug ins and plug outs before getting scratchy).
 
All in all, while at one stage I liked SPDIF over analogue video senders (unfortunatelly without error correction and limited to 1W E.I.R.P), I'm now a big fan of forward error corrected digital audio senders and modifying the internal antennas to go to a booster in front of them.
 
I plan on tidying up my little mucking around and putting everything in steel project cases with selectable output power and hope to test the TX with an Edimax booster. As soon as I can lay my hands on the FHSS (frequency hoping spread spectrum) modules I'll get around to posting more test results and I'm sure I'll be even more impressed with it's stability.
 
I'm gathering more information about where the best place to get the boards or newer boards from to NZ is. However I haven't had a look at the devices to see if the intergrated antennas are easily tapped on the new ones. Will let you know again one day how more experiments like this continue.
 
Gavin.
 
 
 
 
 


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#5727 From: "Gavin Stephens" <gstephens@...>
Date: Tue Jul 22, 2008 11:03 am
Subject:: digital STL testing on a shoe string results
kiwi_rock_24
Offline Offline
Send Email Send Email
 
Hi guys,
 
I thought I'd drop a line as I'd mentioned a while back I was going to play with some digital audio sender devices in the 2.4GHz band for STL ideas. Since digital modulated devices are allowed 4 Watts after the antenna, not 1W like analogue.
 
I bought a couple of cheap second hand DAS-100 units which has www.elansat.com modules in them off trademe once. The module I use are a small self contained 2.4GHz FSK transmitter, D/A and A/D TX/RX respectively. The one I have encodes audio in to 16-bit 44,100Hz stereo, 95dB SNR and range but unbalanced input. It's not a video sender, but rather a dedicated digital audio sender. They take audio up to around +4dBu (assume one drives them with a sound card up to 0 with 3-4 headroom for quantization errors).
 
I had the privilledge of outputting one of these units in to a 21-24dB antenna (never have the TX antenna going with 2.4GHz close to your body) at the TX and RX end, going on the default 10mW output, over 3KM's non-line of site in a city from single level roof top with antennas about 2-3 meters above roof line. While the signal unlocked now and then at 10mW (and considering the antennas can't see each other), the sound on them is terrific. A quick test with an older DSE 500mW Wi-Fi booster made it rock solid. However I'm looking at testing a 100-200mW selectable Edimax booster soon for obvious RF power reasons. I think the Hyper Technologies and Pacific Wireless 12dB mini directional square antennas with high loss coax would be ideal.
 
So my eventual experiment results are, even on 10mW TX output in to a 21+dB antenna with another one on the receive end (probably about 8-10dB loss in cable, amazingly impressed me mucho grande! The great part though.... the modules also use high quality "forward error correction", I believe with this one (I lost my book on it) is 1/2, bit for bit error correction. This compared to freeview satellite delivery only being around 1 error correcting bit for every 3 (3/4). The unit I tested and modified (just the on-board antenna and audio inputs) has 8 channels to choose from.
 
The newer modules and chips do away with selectable channels in favour of frequency hoping instead with 48KHz A/D's and D/A's.
 
Anyway errors weren't a problem working along around a high..ish powered wireless ISP and numerous other WLANs in the area accept on less than 10mW TX power. On the default channel the microwave at home caused the RX to unlock but I know it works well on anything above the default channel at home (I'm awaiting frequencies from manufacturer so I can choose and map out better one). The only draw back is I haven't figured out how to lock the RX on a channel. The channels are button selectable on the TX and the RX auto tunes with diversity antennas (all on board by default). Autotune not being a good idea although not many people in NZ have "digital" audio senders.
 
They are used in digital wireless audio headphones. The other boards they do, have intergrated USB sound cards in the TX although the unit I tested had 3.5mm stereo jacks with a D/A in the TX and a A/D obviously in the receiver. (I promptly replaced the 3.5mm sockets as they didn't take to many plug ins and plug outs before getting scratchy).
 
All in all, while at one stage I liked SPDIF over analogue video senders (unfortunatelly without error correction and limited to 1W E.I.R.P), I'm now a big fan of forward error corrected digital audio senders and modifying the internal antennas to go to a booster in front of them.
 
I plan on tidying up my little mucking around and putting everything in steel project cases with selectable output power and hope to test the TX with an Edimax booster. As soon as I can lay my hands on the FHSS (frequency hoping spread spectrum) modules I'll get around to posting more test results and I'm sure I'll be even more impressed with it's stability.
 
I'm gathering more information about where the best place to get the boards or newer boards from to NZ is. However I haven't had a look at the devices to see if the intergrated antennas are easily tapped on the new ones. Will let you know again one day how more experiments like this continue.
 
Gavin.
 
 
 
 
 

#5726 From: "karolin.keith" <karolin.keith@...>
Date: Sat Jul 12, 2008 3:43 am
Subject:: Online Degree Benefits
karolin.keith
Offline Offline
Send Email Send Email
 
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keep up to date in the chosen field. We also need to improve our skill
sets or study a new discipline to meet ever growing competition in the
job market. Online degrees offer the best solution to all of us as we
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Visit the website for some valuable tips on how to get online degrees:
http://onlinedegrees.advisoronline.info

#5725 From: "Peter Shaw" <akwccr@...>
Date: Sun Jul 6, 2008 9:50 am
Subject:: ***Notice:TSLOLPFMBI update and the next EC meeting***
akwccr
Offline Offline
Send Email Send Email
 
Subject: Next Executive Committee meeting of The Society Of Low Power
FM Broadcasters Incorporated
++++++++++++++++++++++++++++++++++++++++++++++++++++

NEXT MEETING
============
Please note that the Executive Committee meeting of The Society Of Low
Power FM Broadcasters Incorporated plans to hold its next meeting on
Tuesday 8th July 2008 at 7pm at the Auckland VHF Group Clubrooms in
Hazel Avenue, Mount Roskill.

We welcome anyone who wishes to come along and participate, listen
attentively, seek advice, pick our brains, complain, offer general
abuse or even to support us by becoming a member of our dedicated
group (but this is *never* expected). Directions on how to find the
Auckland VHF Group Clubrooms are below.

CHRIS BRENNAN and the Q&A evening
=================================
On a happy note, I would just like to formally, and rather belatedly,
thank Chris Brennan, Manager Northern Regional Services, Radio
Spectrum Management for coming along to our Question and Answer
evening held Tuesday 27th May 2008, and fielding an interesting array
of questions from the floor. It proved to be an extremely useful
session, with all questions being answered in a professional and
forthright way. A video of the event *was* captured, 1 hour 20 minutes
long. Plans to edit this 15 gigabyte digital video file and make it
available to the general LPFM community at large have been stymied by
a lack of free time to do this (it takes a *lot* of time to prepare,
properly edit and render digital video files into something usable).
The intention remains, but no commitment is made as to when - but it
will be ASAP and ATP.


ANOTHER PRACTICAL WORKSHOP EVENING
==================================
I would also like to advise everyone that we plan on holding a
*second* practical "build your own J-Pole antenna" evening quite soon,
and we will be seeking expressions of interest from you. This follow
on session arises out of interest generated from our first successful
construction effort, at which subscribers built and put into service
their very own radiator, with varying degrees of success, but mostly
at the high end of the scale. The exception appears to be the unit
built for, and deployed, temporarily, by Radio Tairua, who
lightheartedly, but seriously, described the attempt as follow:

"Radio Tairua has advanced progressively with massive investment and
time and it is appreciated that someone is looking after my back
behind the scenes. We continue to drive a wedge into Coromandel FM's
monopoly with the slow rise in our market share statistics and plan to
support our community in a way that Coromandel FM could only dream
about. Radio Tairua has started it's own Museum. A light hearted way
of discarding no longer useful pieces and media. Unfortunately the J
Pole has ended up there in almost pristine condition. Due to the fact
that when mounted, reception plummeted to coat hanger levels. I know
we had trouble tuning it and the night was long, we all tried, but the
outcome was a disaster. Never mind, next time perhaps. I look forward
to catching up again at some time or passing out a little teaser
question to occupy your afternoons. Until then, Kind regards, Bruce
Fowlie, Radio Tairua".

It is clear that Bruce has a major problem with his J-Pole, and this
is a matter we have undertaken to help him rectify, as and when we
can. However, Bruce's experience seems to be the exception that proves
the rule: with a J-Pole antenna, a broadcaster should be able to
achieve a better coverage in the horizontal and vertically down
direction than with a standard di-pole, which for a vertically
oriented element radiates like a massive donut, with the "hole" being
in the vertical direction. Please note that in spite of this improved
radiation pattern, a transmission still need to take cognisance of the
500mW EIRP (Effective or Equivalent Isotropic Radiated Power) rule, so
the gain of ANY ANTENNA in ANY direction, CAN NOT exceed that figure!

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Auckland VHF Group (Branch 66) Clubrooms, Mount Roskill
=======================================================

Located in Hazel Avenue, Mount Roskill, at the very END of the street
on the LEFT, behind the Scout Hall. There is a driveway on the left
just past the Scout Hall which takes you down the side of that
building into an area in front of the club rooms where there is room
for a number of cars. There is also plenty of parking in the street.

Hazel Avenue is off Dominion Road. Coming from Mount Albert Road, it
is the SIXTH street on the left. From the other direction, it is the
TENTH street on the right after Balmoral Road.

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++




BRgds to all LPFM folk,

Peter Shaw
Secretary
The Society of Low Power FM Broadcasters Incorporated
Auckland
New Zealand

#5724 From: "wireless.radio" <happydayradio@...>
Date: Sun Jun 29, 2008 9:06 pm
Subject:: Re: Ebay-sourced HLLY Transmitters @ http://tinyurl.com/6prv4v
wireless.radio
Offline Offline
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--- In LPFM_Radio@..., The Cheese <studio@...> wrote:
>
> Is there anyone in NZ who makes LPFM transmitters at a decent price?
>

It depends on what you call a "decent price". I build FM exciters and
transmitters - with the option of integrated stereo encoders, but
because the majority of my clients are commercial or community
operators, my gear is built to professional broadcast standards -
which means it's invariably dearer than something you'd pick up on Ebay.
Bear in mind that any transmitter used on air must meet the technical
standards as set down in the RSM schedule.

#5723 From: "Denis Wadsworth" <mxpress@...>
Date: Sun Jun 29, 2008 7:24 pm
Subject:: Re: [LPFM] Re: Ebay-sourced HLLY Transmitters @ http://tinyurl.com/6prv4v
walkingtheca...
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I agree. I purchased off Stephen nearly two years ago and my TX, in spite of a budget price, is still going strong with no issues at all at any stage.
 
 
Denis
 
 
----- Original Message -----
From: Ethan L
Sent: Sunday, June 29, 2008 10:49 PM
Subject: Re: [LPFM] Re: Ebay-sourced HLLY Transmitters @ http://tinyurl.com/6prv4v

Yup check out Stephen at Point 7 FM in Taupo.

Email: 107.7fmtaupo@gmail.com

:-)  Hope that helps.

The Cheese wrote:

Is there anyone in NZ who makes LPFM transmitters at a decent price?
------------------------------------
---------------------------------------------------------
LPFM Website: http://au.groups.yahoo.com/group/LPFM_RadioYahoo!7 Groups Links
<*> To visit your group on the web, go to:
http://au.groups.yahoo.com/group/LPFM_Radio/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://au.groups.yahoo.com/group/LPFM_Radio/join
(Yahoo! ID required)
<*> To change settings via email:
mailto:LPFM_Radio-digest@yahoogroups.com.au mailto:LPFM_Radio-fullfeatured@yahoogroups.com.au
<*> To unsubscribe from this group, send an email to:
LPFM_Radio-unsubscribe@yahoogroups.com.au
<*> Your use of Yahoo!7 Groups is subject to:
http://au.docs.yahoo.com/info/terms/

--

Kind Regards,
Ethan Lessiter

LFM Logo
Manager / Producer for LFM || Manager for LFM Productions.
Web: http://www.lfmonline.org & http://www.lfmproductions.com
Phone: 07-866-5060 / 027-6965-251

 



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#5722 From: Johnno <valentine@...>
Date: Sun Jun 29, 2008 5:05 pm
Subject:: Re: [LPFM] Re: Ebay-sourced HLLY Transmitters @ http://tinyurl.com/6prv4v
j_larsen2006
Offline Offline
Send Email Send Email
 
yip...

http://www.tennatron.co.nz/

This was my first TX when I started LPFM and I still use it from time to
time....

Johnno

----- Original Message -----
From: "The Cheese" <studio@...>
To: <LPFM_Radio@...>
Sent: Sunday, June 29, 2008 10:46 PM
Subject: [LPFM] Re: Ebay-sourced HLLY Transmitters @
http://tinyurl.com/6prv4v


> Is there anyone in NZ who makes LPFM transmitters at a decent price?
>
>
> ------------------------------------
>
> ---------------------------------------------------------
> LPFM Website: http://au.groups.yahoo.com/group/LPFM_RadioYahoo!7 Groups
Links
>
>
>

#5721 From: Ethan L <ethannz@...>
Date: Sun Jun 29, 2008 10:49 am
Subject:: Re: [LPFM] Re: Ebay-sourced HLLY Transmitters @ http://tinyurl.com/6prv4v
ethannz@...
Send Email Send Email
 
Yup check out Stephen at Point 7 FM in Taupo.

Email: 107.7fmtaupo@...

:-)  Hope that helps.

The Cheese wrote:
Is there anyone in NZ who makes LPFM transmitters at a decent price?
------------------------------------
---------------------------------------------------------
LPFM Website: http://au.groups.yahoo.com/group/LPFM_RadioYahoo!7 Groups Links
<*> To visit your group on the web, go to:
http://au.groups.yahoo.com/group/LPFM_Radio/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://au.groups.yahoo.com/group/LPFM_Radio/join
(Yahoo! ID required)
<*> To change settings via email:
mailto:LPFM_Radio-digest@... mailto:LPFM_Radio-fullfeatured@...
<*> To unsubscribe from this group, send an email to:
LPFM_Radio-unsubscribe@...
<*> Your use of Yahoo!7 Groups is subject to:
http://au.docs.yahoo.com/info/terms/

--

Kind Regards,
Ethan Lessiter

LFM Logo
Manager / Producer for LFM || Manager for LFM Productions.
Web: http://www.lfmonline.org & http://www.lfmproductions.com
Phone: 07-866-5060 / 027-6965-251

 


#5720 From: The Cheese <studio@...>
Date: Sun Jun 29, 2008 10:46 am
Subject:: Re: Ebay-sourced HLLY Transmitters @ http://tinyurl.com/6prv4v
grantthoms
Offline Offline
Send Email Send Email
 
Is there anyone in NZ who makes LPFM transmitters at a decent price?

#5719 From: "wireless.radio" <happydayradio@...>
Date: Sun Jun 29, 2008 7:12 am
Subject:: Re: Ebay-sourced HLLY Transmitters @ http://tinyurl.com/6prv4v
wireless.radio
Offline Offline
Send Email Send Email
 
--- In LPFM_Radio@..., "celticupbringing"
<Spellchecker@...> wrote:
>
> Does anyone have any info/opinions they're willing to share here ?
>
> http://tinyurl.com/6prv4v
>
>
> Cheers & Tia ............  Cb
>

Chinese junk, literally.
Looks great on the outside but inside is not worth knowing. I was
asked to fix one of these Chinese made units a while ago and in the
end I threw it in the bin.
The unit got so hot it was impossible to touch, it wouldn't lock on
frequency even though it was PLL and it sounded awful on-air.

Save your money and buy something made ANYWHERE but China.

#5718 From: Barrie Woods <bmwoods@...>
Date: Wed Jun 25, 2008 5:00 am
Subject:: Re: [LPFM] Ebay-sourced HLLY Transmitters @ http://tinyurl.com/6prv4v
bmwoods@...
Send Email Send Email
 

Hi,

 

Looks a nicely finished unit but too much power to comply with the LPFM regs, so you'd need to trim it back in order to use it legally.  That's assuming it delivers what they say it does.

 

If Maurice is right about it being based on the Rohm 1415 chip, then as he says it's designed for use as an audio sender for ipods, etc.  The audio specs for the chip are adequate but nothing flash, though it does have a built in limiter and preemphasis (fixed at 50uS).  The output of the 1415 is quoted as 100dBuV (just enough to transmit across a room), so what happens when it is amplified up to 5 watts is a bit of an unknown.

 

It may well perform comparably with other budget transmitters and I guess you get what you pay for.

 

The antenna they supply with the unit is intriguing! 

 

Cheers,

Barrie

----- Original Message ----
From: celticupbringing <Spellchecker@...>
To: LPFM_Radio@...
Sent: Wednesday, 25 June, 2008 12:17:30 PM
Subject: [LPFM] Ebay-sourced HLLY Transmitters @ http://tinyurl.com/6prv4v

Does anyone have any info/opinions they're willing to share here ?

http://tinyurl. com/6prv4v

Cheers & Tia ............ Cb


#5717 From: "M.B&J.D Duffy" <DuffyFamily@...>
Date: Wed Jun 25, 2008 1:09 am
Subject:: Re: [LPFM] Ebay-sourced HLLY Transmitters @ http://tinyurl.com/6prv4v
DuffyFamily@...
Send Email Send Email
 
Hi, based on Rhom 1415 chip. the chip set is barely suitable as a fm sender for ipods etc in cars let alone being amped for LPFM.
 
Maurice 
----- Original Message -----
Sent: Wednesday, June 25, 2008 12:25 PM
Subject: Re: [LPFM] Ebay-sourced HLLY Transmitters @ http://tinyurl.com/6prv4v

Not those particular ones but have used a 5W one on a dummy load for several months now,its a cheap one from China,probably on their ebay site,the size of a small square box.it has been going for a few months now and no problems so far.
 
Michael.


celticupbringing <Spellchecker@gmail.com> wrote:
Does anyone have any info/opinions they're willing to share here ?

http://tinyurl.com/6prv4v

Cheers & Tia ............ Cb



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Version: 7.5.524 / Virus Database: 270.0.0/1486 - Release Date: 05/06/2008 18:29

#5716 From: Michael and Ross <alnairgrus@...>
Date: Wed Jun 25, 2008 12:25 am
Subject:: Re: [LPFM] Ebay-sourced HLLY Transmitters @ http://tinyurl.com/6prv4v
alnairgrus
Offline Offline
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Not those particular ones but have used a 5W one on a dummy load for several months now,its a cheap one from China,probably on their ebay site,the size of a small square box.it has been going for a few months now and no problems so far.
 
Michael.


celticupbringing <Spellchecker@...> wrote:
Does anyone have any info/opinions they're willing to share here ?

http://tinyurl.com/6prv4v

Cheers & Tia ............ Cb



#5715 From: "celticupbringing" <Spellchecker@...>
Date: Wed Jun 25, 2008 12:17 am
Subject:: Ebay-sourced HLLY Transmitters @ http://tinyurl.com/6prv4v
celticupbrin...
Offline Offline
Send Email Send Email
 
Does anyone have any info/opinions they're willing to share here ?

http://tinyurl.com/6prv4v


Cheers & Tia ............  Cb

#5714 From: "Ross Levis" <ross@...>
Date: Tue Jun 10, 2008 5:18 am
Subject:: Auckland LPFM/RSM talk?
rosslevis
Offline Offline
Send Email Send Email
 

Were there any answers to our questions from the RSM meeting?

 

Cheers,

Ross.


#5713 From: "Gavin Stephens" <gstephens@...>
Date: Sat May 31, 2008 4:01 am
Subject:: Re: [LPFM] Telephone Hybrid For Sale - Studer.
kiwi_rock_24
Offline Offline
Send Email Send Email
 
Last note on this unit, is now listed for auction.
auction #    158172998
Can contact owner of unit by ph# provided for any more info.
 
Thanks,
Gavin.
 

#5712 From: Al Pa <alip51@...>
Date: Tue May 27, 2008 12:54 pm
Subject:: Al Pa has sent you private message
hilltophouse...
Offline Offline
Send Email Send Email
 
Hey,

I just took the quiz "color blindness test ( efra made )" on Flixster. Try it so we can compare our scores >>

Here is the first question:

what number u see ?
 
a. 25
b. 28
c. 29
d. 19
e. 26





This email was sent to lpfm_radio@....
If you prefer not to receive this email tell us here.

Or you can notify us in writing to this address: Flixster, PO Box 40577, San Francisco, CA 94110

#5711 From: "Peter Shaw" <akwccr@...>
Date: Sun May 25, 2008 12:46 pm
Subject:: Reminder: TSOLPFMBI Q&A evening, and some QUESTIONS to be put
akwccr
Offline Offline
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Here is the email I have just sent off to Chris Brennan, Manager
Northern Regional Services, Radio Spectrum Management...

Hello Chris,

Here are some specific questions that have been sent in to us, which
we will be putting to you at the Q&A session commencing at 7:30pm on
Tuesday 27th May 2008 at the Auckland VHF Clubrooms. I would expect
other questions to arise during the course of the evening.

This email has been copied to our distribution list, and we repeat our
invitation to all interested parties to come along to the meeting and
avail themselves of the opportunity to meet you, and raise any issues
they may have with you directly.

For the benefit of everybody, and to avoid repeating previously
distributed information on the time and location, full details can be
found at this post on the Yahoo LPFM discussion group here:

http://au.groups.yahoo.com/group/LPFM_Radio/message/5704

and here:

http://au.groups.yahoo.com/group/LPFM_Radio/message/5693


Questions that have been submitted by various LPFM folk:
=======================================================

Rob Holding <rob@...>
==============================

- what is being done about regular offenders re: over power?

- what are we upping the power to and when will that be?

- do SPECTRUM have an upper limit to allowable income for a LPFM station?


Chris Mackerell - WorldFM Tawa <chris@...>
====================================================

Being in Wellington I won't be able to attend the meeting, but maybe
you could get Chris to comment on this (assuming it hasn't been asked
already):

- What place do the Ministry see for LPFM broadcasters in their
"Digital Strategy" for the future? More specifically, will LPFM
stations be able to use digital modes such as HD-Radio/IBOC or
DRM/DRM+ within the existing FM LPFM channels, or use experimental low
power DRM in the 26 MHz shortwave broadcast band?


Ross Levis writes:
==================

I know several LPFMers who want to know the following for future
planning purposes:

- What is the likely date the lower guard-band frequencies will be
moving to the proposed 87.5 - 88.3 area?

- Will 87.5 and 88.3 be usable frequencies?

- Will there be a change of power to 1 watt as previously proposed,
and if so, will there be any additional restrictions such as antenna
or location height?  When will this happen?


Here are a couple more arising out of the last Executive Committee
meeting:
==========================================================================

- RSM be requested to make it SIMPLER for Joe Blow to determine his
power level in order to comply with the GURL

- what has happened to the proposal to increase the power limit of
LPFM stations to one watt?

- Auckland broadcasters remain penalised by the restriction on using
88.5, 88.6 and 88.7 due to Mai FM using 88.6. This seems to be unfair
on LPFM broadcasters who try to operate in the country's largest
population base. Does RSM have any proposals to remedy this?

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


Best wishes,
Peter


Peter Shaw
Secretary
The Society of Low Power FM Broadcasters Incorporated
Auckland
New Zealand

#5710 From: "Peter Shaw" <akwccr@...>
Date: Sun May 25, 2008 12:31 pm
Subject:: Re: [LPFM] TSOLPFMBI: RSM Q&A Evening on Tuesday 27th May 2008 at 7:30pm
akwccr
Offline Offline
Send Email Send Email
 
Thanks Ross. I've taken note of your questions.

BRgds,
Peter

--- In LPFM_Radio@..., "Ross Levis" <ross@...> wrote:
>
> Peter,
>
>
>
> I know several LPFMers who want to know the following for future
planning
> purposes.
>
>
>
> What is the likely date the lower guard-band frequencies will be
moving to
> the proposed 87.5 - 88.3 area?
>
>
>
> Will 87.5 and 88.3 be usable frequencies?
>
>
>
> Will there be a change of power to 1 watt as previously proposed,
and if so,
> will there be any additional restrictions such as antenna or location
> height?  When will this happen?
>
>
>
> That's all for now.
>
>
>
> Thanks,
>
> Ross.
>
>
>
> From: LPFM_Radio@...
[mailto:LPFM_Radio@...]
> On Behalf Of Peter Shaw
> Sent: Thursday, 1 May 2008 8:50 p.m.
> To: LPFM_Radio@...
> Subject: [LPFM] TSOLPFMBI: RSM Q&A Evening on Tuesday 27th May 2008 at
> 7:30pm
>
>
>
> NOTICE TO ALL LPFM PEOPLE:
> =========================
>

---SNIP---

#5709 From: "Gavin Stephens" <gstephens@...>
Date: Sun May 25, 2008 5:51 am
Subject:: Re: [LPFM] Telephone Hybrid For Sale - Studer.
kiwi_rock_24
Offline Offline
Send Email Send Email
 
I should make it more clear that the $200 btw is the reserve price for auction not final figure.
 
Cheers,
Gavin.
 
 
----- Original Message -----
Sent: Saturday, May 24, 2008 12:56 PM
Subject: [LPFM] Telephone Hybrid For Sale - Studer.

Before I go listing this on TradeMe on behalf of, I thought it's worth dropping a quick note in here for anyone interested first.
 
A Studer Telephone Hybrid ex: Radio Rhema for sale, $200.
 
19" rack mountable.
 
Balanced mono line in and out to console. Telephone line input and output for phone.
 
It's a two line hybrid missing the second card (only one line working).
 
Apparently it was pulled working but needed an adjustment to configure it correctly. They decided to just replace it.
 
It's on behalf of an LPFM station owner who owns it. I'm awaiting some photos to arrive but they also read and reply to these LPFM posts so any enquires just reply to group or off list gstephensatwoosh.company.newzealand
 
There's no service manual with it that I'm aware of.
 
Kind Regards,
Gavin,
Invercargill.
 


#5708 From: "Professionally Tacky" <moshboxradio@...>
Date: Sat May 24, 2008 8:36 am
Subject:: Re: Telephone Hybrid For Sale - Studer.
moshbox
Offline Offline
Send Email Send Email
 
err configured link to offlist not working :p could a reply be made o
n this thread regarding this? thanks


--- In LPFM_Radio@..., "Professionally Tacky"
<moshboxradio@...> wrote:
>
> Allso, before going ahead,
>
> What exactly, if anything is wrong with it, with adjustments etc/
>
> OH and just realsied the reply thread, thanks XD
>
> --- In LPFM_Radio@..., "Gavin Stephens"
> <gstephens@> wrote:
> >
> > Before I go listing this on TradeMe on behalf of, I thought it's
> worth dropping a quick note in here for anyone interested first.
> >
> > A Studer Telephone Hybrid ex: Radio Rhema for sale, $200.
> >
> > 19" rack mountable.
> >
> > Balanced mono line in and out to console. Telephone line input
and
> output for phone.
> >
> > It's a two line hybrid missing the second card (only one line
> working).
> >
> > Apparently it was pulled working but needed an adjustment to
> configure it correctly. They decided to just replace it.
> >
> > It's on behalf of an LPFM station owner who owns it. I'm awaiting
> some photos to arrive but they also read and reply to these LPFM
> posts so any enquires just reply to group or off list
> gstephensatwoosh.company.newzealand
> >
> > There's no service manual with it that I'm aware of.
> >
> > Kind Regards,
> > Gavin,
> > Invercargill.
> >
>

#5707 From: "Professionally Tacky" <moshboxradio@...>
Date: Sat May 24, 2008 8:34 am
Subject:: Re: Telephone Hybrid For Sale - Studer.
moshbox
Offline Offline
Send Email Send Email
 
Allso, before going ahead,

What exactly, if anything is wrong with it, with adjustments etc/

OH and just realsied the reply thread, thanks XD

--- In LPFM_Radio@..., "Gavin Stephens"
<gstephens@...> wrote:
>
> Before I go listing this on TradeMe on behalf of, I thought it's
worth dropping a quick note in here for anyone interested first.
>
> A Studer Telephone Hybrid ex: Radio Rhema for sale, $200.
>
> 19" rack mountable.
>
> Balanced mono line in and out to console. Telephone line input and
output for phone.
>
> It's a two line hybrid missing the second card (only one line
working).
>
> Apparently it was pulled working but needed an adjustment to
configure it correctly. They decided to just replace it.
>
> It's on behalf of an LPFM station owner who owns it. I'm awaiting
some photos to arrive but they also read and reply to these LPFM
posts so any enquires just reply to group or off list
gstephensatwoosh.company.newzealand
>
> There's no service manual with it that I'm aware of.
>
> Kind Regards,
> Gavin,
> Invercargill.
>

#5706 From: "Professionally Tacky" <moshboxradio@...>
Date: Sat May 24, 2008 8:31 am
Subject:: Re: Telephone Hybrid For Sale - Studer.
moshbox
Offline Offline
Send Email Send Email
 
Hey,

MoshBox Radio NEEDS a hybrid phone PLEEEAASE! but we only have $150
to burn at the moment, seeing that we're re-establishing and are
pretty much student run,,

is there a possibility we could throw in 'something' and $150 for the
phone?

Please pretty please XD

Kermath
kermath@...
www.moshboxradio.com
MOSHBOX RADIO 106.7 EAST Auckland
'professionally tacky'


--- In LPFM_Radio@..., "Gavin Stephens"
<gstephens@...> wrote:
>
> Before I go listing this on TradeMe on behalf of, I thought it's
worth dropping a quick note in here for anyone interested first.
>
> A Studer Telephone Hybrid ex: Radio Rhema for sale, $200.
>
> 19" rack mountable.
>
> Balanced mono line in and out to console. Telephone line input and
output for phone.
>
> It's a two line hybrid missing the second card (only one line
working).
>
> Apparently it was pulled working but needed an adjustment to
configure it correctly. They decided to just replace it.
>
> It's on behalf of an LPFM station owner who owns it. I'm awaiting
some photos to arrive but they also read and reply to these LPFM
posts so any enquires just reply to group or off list
gstephensatwoosh.company.newzealand
>
> There's no service manual with it that I'm aware of.
>
> Kind Regards,
> Gavin,
> Invercargill.
>

#5705 From: "Gavin Stephens" <gstephens@...>
Date: Sat May 24, 2008 12:56 am
Subject:: Telephone Hybrid For Sale - Studer.
kiwi_rock_24
Offline Offline
Send Email Send Email
 
Before I go listing this on TradeMe on behalf of, I thought it's worth dropping a quick note in here for anyone interested first.
 
A Studer Telephone Hybrid ex: Radio Rhema for sale, $200.
 
19" rack mountable.
 
Balanced mono line in and out to console. Telephone line input and output for phone.
 
It's a two line hybrid missing the second card (only one line working).
 
Apparently it was pulled working but needed an adjustment to configure it correctly. They decided to just replace it.
 
It's on behalf of an LPFM station owner who owns it. I'm awaiting some photos to arrive but they also read and reply to these LPFM posts so any enquires just reply to group or off list gstephensatwoosh.company.newzealand
 
There's no service manual with it that I'm aware of.
 
Kind Regards,
Gavin,
Invercargill.
 

#5704 From: "Peter Shaw" <akwccr@...>
Date: Thu May 22, 2008 10:26 am
Subject:: ***REMINDER*** TSOLPFMBI: RSM Q&A Evening on Tuesday 27th May 2008 at 7:30pm
akwccr
Offline Offline
Send Email Send Email
 
Here is a reminder to all folk interested in LPFM that TSOLPFMBI will
host Chris Brennan on Tuesday 27th May 2005 for a Question and Answer
evening at 7:30pm at the Auckland VHF Group (Branch 66) Clubrooms,
Mount Roskill. Directions on how to get there are below.

If you have any questions you wish to ask, or have any issues you wish
to raise, come along and put them to Chris.

For example, one of our members has written:

> what is being done about regular offenders re: over power?
> what are we upping the power to and when will that be?
> do SPECTRUM have an upper limit to allowable income for a LPFM station?
>
>these may be well known questions with well known answers but not by me
>hence I ask the dumb questions for those to shy to do so.

There is NO SUCH THING as a dumb question. If you don't know the
answer to a particular question, then asking someone who does is a
perfectly sensible thing to do.


++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Auckland VHF Group (Branch 66) Clubrooms, Mount Roskill
=======================================================

Located in Hazel Avenue, Mount Roskill, at the very END of the street
on the LEFT, behind the Scout Hall. There is a driveway  on the left
just past the Scout Hall which takes you down the side of that
building into an area in front of the club rooms where there is room
for a number of cars. There is also plenty of parking in the street.

Hazel Avenue is off Dominion Road. Coming from Mount Albert Road, it
is the SIXTH street on the left. From the other direction, it is the
TENTH street on the right after Balmoral Road.

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


Original notice follows...


NOTICE TO ALL LPFM PEOPLE:
=========================

The Society Of Low Power FM Broadcasters Incorporated is pleased to
announce that it will host Chris Brennan, Manager Northern Regional
Services, Radio Spectrum Management (part of the Ministry of Economic
Development) for a Question and Answer evening at 7:30pm on Tuesday
27th May 2008.

It is now almost three years since we held our first well attended RSM
PRESENTATION and Q&A EVENING, on Tuesday 27th May 2005, at which Chris
Brennan and Ian Hutchings impressed us all with an excellent
presentation, and answered a number of questions from the floor.

Given the time that has elapsed, and the changes that have occurred in
the area of broadcasting since 2005, we feel that now is a good time
to repeat the exercise.

Chris is has accepted our invitation and is prepared to answer
questions on any matters of interest relating to broadcasting. What we
would like to have now is some feedback from the wider LPFM group.
Please send in your questions to me so that Chris has time, if he
needs it, to prepare the material he needs to answer them.

We will open this meeting to ALL LPFM folk. Society non-members will
be most welcome, but will be asked to contribute to the cost of the
venue by way of a small door charge.

Please email the Secretary (by return email) with any questions you
may have, and please indicate if you plan to attend.



BRgds,
Peter Shaw
Secretary
The Society of Low Power FM Broadcasters Incorporated
Auckland
New Zealand

#5703 From: "Gavin Stephens" <gstephens@...>
Date: Tue May 20, 2008 11:10 pm
Subject:: Re: [LPFM] Difference between...
kiwi_rock_24
Offline Offline
Send Email Send Email
 
A crude illustration:
 
Original stereo track:
 
[  LEFT  |  RIGHT  ]
 
Independent stereo MP3 encoding:
 
[  LEFT  |  RIGHT  ]
 
Joint stereo MP3 Encoding:
 
[L| MONO |R]
 
Joint saves on bandwidth required by encoding a lot of the audio as mono since a lot of stereo tracks contain mostly the same audio in both left and right channels. Hence why it's used on bitrate usually below 224Kbps. Of course if left is quite out of phase with right, this causes a cancellation effect when combined in to a mono track for storing most of the the MP3 joint stereo bitstream. The other problem, if the track is like a lot of Beatles stereo tracks where left and right are almost completely different, the result is a low bitrate sounding MP3 recording because there's not much bitstream reserved for extremely stereophonic tracks.
 
224Kbps and above MP3 encoding is usually independent stereo as it should be. Sometimes 192 is, but anything less is usually joint.
 
If you're going to stream, drop mp3 and consider aac as Ross mentioned. If you're going to store, hard drive space is pretty cheap these days and doesn't really warrant the need for lossy audio compression. It helps future proof against changing codecs and compression methods and multiple compression for delivery etc...
 
I still listen to PCM tracks straight through an AAC stream and the difference to me is quite a lot compared with something starting its delivery from MP3 or still common - MP2 somewhere.
 
Gavin.
 
 
----- Original Message -----
From: Herb
Sent: Tuesday, May 20, 2008 10:52 PM
Subject: [LPFM] Difference between...

Stereo & Joint Stereo for MP3 ripping?

Could someone please explain this to me?

Cheers,

Herb.



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