I've been watching all the suggestions for reducing power and that is a
simple and practical way of dealing with it. However if you have the
schematic diagram of your transmitter you will usually find there is a
limiting resistor in series with supply to the final amplifier stage.
Some of the kitsets have instructions on changing the value to lower or
increase the output power. I did this sucessfully to a transmitter from
the UK which was to be used for translation purposes in a public hall.
Increasing the value lowered the power from 1 watt to the 50mW that was
needed.

Stewart

--- In LPFM_Radio@..., "Michael Rowse" <mike@...> wrote:
>
> Heya guys,
>
> Anybody got any bright ideas on how to reduce the signal coming out of
> the back of the transmitter? We have a one watt transmitter but wish
> to reduce it down to approx 300mW so as not to interfere with another
> close station. (we are going to be using this TX as a link system)
> Would some kind of attenuator do the trick or is there another method?
> The cheaper the better.
>
> Thanks in advance
> Mike
>

The figures are based on the Freq Range, SWR ratio (ie: 1:1) and the cable
that is being used...

If we use 88.4 mhz, 1 Watt, SWR 1:1 and using RG58A = 39 Metres for 294 mw
output, 60 metres would get you 152 mw output

The figures given are very close approximation only for additional losses
due to SWR.

Ie. if SWR is 2:1 then RG58a = 35 metres for 300 mw output

SWR 1:1 = 0% Power Loss
SWR 1.5:1 = 3% Power Loss
SWR 2:1 = 11% Power Loss
SWR 3:1 = 25% Power Loss
SWR 4:1 = 38% Power Loss
SWR 10:1 = 70% Power Loss

A SWR of 1:1 to 2:1 is usually considered ok for most operations

Anything above SWR 2:1 The aerial may need tunning or you have an issue with
aerial system

Hence with LPFM the shorter the cable and tunned aerial at your freq range
will get you the best results...

1 metre @ 88.4, SWR 1:1, TX 1 watt = 969mw output

I am still looking in to see if the limits here in New Zealand are 500mw
from the antenna or the TX end..

If it is from the antenna end then a 10 metre coax (RG58a) you could run
your tx around the 700mw to give a 512mw output

Many thinking buying a TX, Antenna and something to play music on is all (I
find many of them over power)...

As you can see if you are serious about LPFM and getting your message out,
it takes a little bit of planning, licenses etc and if anything goes right
RSM leaves you alone..


I hope all this helps...

Johnno


----- Original Message -----
From: "Michael Rowse"
To: <LPFM_Radio@...>
Sent: Friday, February 15, 2008 6:56 AM
Subject: Re: [LPFM] Re:Reducing output signal


Hey Johnno,

Studying your figures, it seems that RG58A has a loss of 13mW per metre? So
would I be right in saying to get a 1 watt TX down to approx. 300mW or less
I would need around 60 metres of RG58A?

Cheers, Mike


On 15/02/2008 12:01:31 a.m., Johnno wrote:
> Hello Grant,
>
> Will be a little loss in TX power... now to get my calculator out :)))
>
> If your TX is out putting 500mw @ 88.4 MHZ, SWR of 1:1 at 7 meters of
> coax
> will be
>
> RG58 = Output 409 mw
> RG58A = Output 401 mw
> RG58C = Output 384 mw
> RG213 = Output 450 mw
>
> If you have already increased TX to 1 watt for the 87.5 - 88.4 as RSM is
> talking about then the following applies..
>
> RG58 = Output 818 mw
> RG58A = Output 803 mw
> RG58C = Output 768 mw
> RG213 = Output 901 mw
>
> I hope that helps...
>
> Johnno
>
> ----- Original Message -----
> From: "88.4 FM The Cheese"
> Sent: Thursday, February 14, 2008 10:46 PM
> Subject: [LPFM] Re:Reducing output signal
>
> > This is of interest to me, as I need to move my transmitter for a few
> > weeks while decorating the studio.
> > I have a 7 metre coax extension lead. Will this cause much loss to my
> > transmitter power?
> >
> > Cheers,
> > Grant
> >
> >
> >

Hello Grant,

Will be a little loss in TX power... now to get my calculator out :)))

If your TX is out putting 500mw @ 88.4 MHZ, SWR of 1:1 at 7 meters of coax
will be

RG58 = Output 409 mw
RG58A = Output 401 mw
RG58C = Output 384 mw
RG213 = Output 450 mw

If you have already increased TX to 1 watt for the 87.5 - 88.4 as RSM is
talking about then the following applies..

RG58 = Output 818 mw
RG58A = Output 803 mw
RG58C = Output 768 mw
RG213 = Output 901 mw

I hope that helps...

Johnno



----- Original Message -----
From: "88.4 FM The Cheese" <studio@...>
To: <LPFM_Radio@...>
Sent: Thursday, February 14, 2008 10:46 PM
Subject: [LPFM] Re:Reducing output signal


> This is of interest to me, as I need to move my transmitter for a few
> weeks while decorating the studio.
> I have a 7 metre coax extension lead.  Will this cause much loss to my
> transmitter power?
>
> Cheers,
> Grant
>
>
>
> --
> 88.4FM The Cheese - Hits Of The 80s, 90s and Today!
> www.thecheese.co.nz <http://www.thecheese.co.nz/>
>
> P.O Box 43214, Wainuiomata 5014, New Zealand
> studio@... <mailto:studio@...>
>
>
>
> ---------------------------------------------------------
> LPFM Website: http://au.groups.yahoo.com/group/LPFM_Radio
> Yahoo!7 Groups Links
>
>
>

This is of interest to me, as I need to move my transmitter for a few
weeks while decorating the studio.
I have a 7 metre coax extension lead.  Will this cause much loss to my
transmitter power?

Cheers,
Grant



--
88.4FM The Cheese - Hits Of The 80s, 90s and Today!
www.thecheese.co.nz <http://www.thecheese.co.nz/>

P.O Box 43214, Wainuiomata 5014, New Zealand
studio@... <mailto:studio@...>

As someone else suggested... use a few different radios... don't rely on
a home stereo because most home stereos don't have proper aerials
installed... they will only recieve stations with power higher than 1 kw
if over 1km away from your location.... most car stereos can pick up
signals from a LPFM from one side of town to the other.

M.B&J.D Duffy wrote:
> Thanks for that I have suggested they try picking up different station where
the tx will be located to ascertain a free space?
>
> Maurice
>   ----- Original Message -----
>   From: Phil Grey
>   To: LPFM_Radio@...
>   Sent: Thursday, February 14, 2008 11:20 AM
>   Subject: RE: [LPFM] Hamilton
>
>
>
>   You can find a slightly outdated list at www.communityradio.co.nz under
Links> Low Power FM
>
>
>
>   At the upper end, we're on 106.7 and cover right out the north end. 106.9 is
KFM streaming down from AK, MaxFM [Wintec] is 107.1, 107.3 and 107.5 are used by
AK stations, 107.7 is a River Rd/Chartwell based LPFM.  In the lower end you
have contact on 88.1, not sure who else at present.. Do some field tests using a
variety of receivers.
>
>
>
>   regards
>
>
>
>
>
>
>
>   Phil Grey
>
>   General Manager
>
>   Community Radio Hamilton FM 106.7 / AM 1206
>
>   ddi 07 8342170   cell 021 710 705
>
>
>
>   live stream, on demand and podcasting from www.communityradio.co.nz
>
>
>
>
>
>
> ------------------------------------------------------------------------------
>
>   From: LPFM_Radio@... [mailto:LPFM_Radio@...]
On Behalf Of M.B&J.D Duffy
>   Sent: Wednesday, 13 February 2008 5:00 p.m.
>   To: LPFM_Radio@...
>   Subject: [LPFM] Hamilton
>
>
>
>   I will be shortly building up a station for a youth group in Hamilton. It
will be based out Te Rapa way. I haven't looked at what freqs. are being used up
there but if there are any LPFM group on this list who could advise me of their
freq. so as not to encroach on them etc.
>
>
>
>   Thanks
>
>   Maurice
>
>
>
>
>
> ------------------------------------------------------------------------------
>
>

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

From: Phil Grey

To: LPFM_Radio@...

Sent: Thursday, February 14, 2008 11:20 AM

Subject: RE: [LPFM] Hamilton

You can find a slightly outdated list at www.communityradio.co.nz under Links> Low Power FM

At the upper end, we’re on 106.7 and cover right out the north end. 106.9 is KFM streaming down from AK, MaxFM [Wintec] is 107.1, 107.3 and 107.5 are used by AK stations, 107.7 is a River Rd/Chartwell based LPFM.  In the lower end you have contact on 88.1, not sure who else at present…. Do some field tests using a variety of receivers.

regards

Phil Grey

General Manager

Community Radio Hamilton FM 106.7 / AM 1206

ddi 07 8342170   cell 021 710 705

live stream, on demand and podcasting from www.communityradio.co.nz

---

From: LPFM_Radio@yahoogroups.com.au [mailto:LPFM_Radio@yahoogroups.com.au] On Behalf Of M.B&J.D Duffy
Sent: Wednesday, 13 February 2008 5:00 p.m.
To: LPFM_Radio@yahoogroups.com.au
Subject: [LPFM] Hamilton

I will be shortly building up a station for a youth group in Hamilton. It will be based out Te Rapa way. I haven't looked at what freqs. are being used up there but if there are any LPFM group on this list who could advise me of their freq. so as not to encroach on them etc.

Thanks

Maurice

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

From: Phil Grey

To: LPFM_Radio@...

Sent: Thursday, February 14, 2008 11:20 AM

Subject: RE: [LPFM] Hamilton

You can find a slightly outdated list at www.communityradio.co.nz under Links> Low Power FM

At the upper end, we’re on 106.7 and cover right out the north end. 106.9 is KFM streaming down from AK, MaxFM [Wintec] is 107.1, 107.3 and 107.5 are used by AK stations, 107.7 is a River Rd/Chartwell based LPFM.  In the lower end you have contact on 88.1, not sure who else at present…. Do some field tests using a variety of receivers.

regards

Phil Grey

General Manager

Community Radio Hamilton FM 106.7 / AM 1206

ddi 07 8342170   cell 021 710 705

live stream, on demand and podcasting from www.communityradio.co.nz

---

From: LPFM_Radio@yahoogroups.com.au [mailto:LPFM_Radio@yahoogroups.com.au] On Behalf Of M.B&J.D Duffy
Sent: Wednesday, 13 February 2008 5:00 p.m.
To: LPFM_Radio@yahoogroups.com.au
Subject: [LPFM] Hamilton

I will be shortly building up a station for a youth group in Hamilton. It will be based out Te Rapa way. I haven't looked at what freqs. are being used up there but if there are any LPFM group on this list who could advise me of their freq. so as not to encroach on them etc.

Thanks

Maurice

---

No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.516 / Virus Database: 269.20.2/1272 - Release Date: 11/02/2008 17:28

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

From: John Peterson

To: LPFM_Radio@...

Sent: Thursday, February 14, 2008 8:24 AM

Subject: Re: [LPFM] Reducing output signal

Geoff's right. The easiest way to reduce power is to use more coax. The
data is in the back of the Dick Smith catalog. If I remember correctly the
spec for rg-58 is 16.1 db loss per 100 meters of line at 100 mHz.

If you're just going to use it as a link then you could also drop the
output a lot and use directional antennas. That would minimise
interference as well.

There is another possibility that I haven't tried, and maybe some has and
can comment. That is to use one of the good quality a/v senders that use
the 2.4 gig (free) band. There is one made by Digisender that lets you use
directional, external antennas and will cover a good distance.

John

On Thu, 14 Feb 2008 09:13:39 +1300, Geoff Barkman <barknet@clear.net.nz>
wrote:
> Probably the cheapest/way to reduce power is to add attentuation to the
> aerial lead.
> Add length to the cable... not sure of exact figures but adding 10
> metres to aerial lead will lower output power.
> Or make a 3 resistor wire network to reduce power. At a guess you need 3
> - 5 db of attentuation on your transmitter.
> Any amateur radio club or RT installer should be able to give you the
> appropriate values to use. The ARRL (American Amateur radio league)
> published stuff in their hand book about this.
> Modifying your transmitter is tricky because it could upset the internal
> tuning of it... making it unstable. Also make sure there is no external
> controls for adjusting power... not sure how adding aerial attenuation
> fits into this rule.
> Cheers
> Geoff Barkman
>
> Michael Rowse wrote:
>> Heya guys,
>>
>> Anybody got any bright ideas on how to reduce the signal coming out of
>> the back of the transmitter? We have a one watt transmitter but wish
>> to reduce it down to approx 300mW so as not to interfere with another
>> close station. (we are going to be using this TX as a link system)
>> Would some kind of attenuator do the trick or is there another method?
>> The cheaper the better.
>>
>> Thanks in advance
>> Mike
>>
>>
>>
>> ----------------------------------------------------------
>>
>>

Geoff's right.  The easiest way to reduce power is to use more coax.  The
data is in the back of the Dick Smith catalog.  If I remember correctly the
spec for rg-58 is 16.1 db loss per 100 meters of line at 100 mHz.

If you're just going to use it as a link then you could also drop the
output a lot and use directional antennas.  That would minimise
interference as well.

There is another possibility that I haven't tried, and maybe some has and
can comment.  That is to use one of the good quality a/v senders that use
the 2.4 gig (free) band.  There is one made by Digisender that lets you use
directional, external antennas and will cover a good distance.

John

On Thu, 14 Feb 2008 09:13:39 +1300, Geoff Barkman <barknet@...>
wrote:
> Probably the cheapest/way to reduce power is to add attentuation to the
> aerial lead.
> Add length to the cable... not sure of exact figures but adding 10
> metres to aerial lead will lower output power.
> Or make a 3 resistor wire network to reduce power. At a guess you need 3
> - 5 db of attentuation on your transmitter.
> Any amateur radio club or RT installer should be able to give you the
> appropriate values to use. The ARRL (American Amateur radio league)
> published stuff in their hand book about this.
> Modifying your transmitter is tricky because it could upset the internal
> tuning of it... making it unstable. Also make sure there is no external
> controls for adjusting power... not sure how adding aerial attenuation
> fits into this rule.
> Cheers
> Geoff Barkman
>
> Michael Rowse wrote:
>> Heya guys,
>>
>> Anybody got any bright ideas on how to reduce the signal coming out of
>> the back of the transmitter? We have a one watt transmitter but wish
>> to reduce it down to approx 300mW so as not to interfere with another
>> close station. (we are going to be using this TX as a link system)
>> Would some kind of attenuator do the trick or is there another method?
>> The cheaper the better.
>>
>> Thanks in advance
>> Mike
>>
>>
>>
>> ------------------------------------------------------------------------
>>
>>

Probably the cheapest/way to reduce power is to add attentuation to the
aerial lead.
Add length to the cable... not sure of exact figures but adding 10
metres to aerial lead will lower output power.
Or make a 3 resistor wire network to reduce power. At a guess you need 3
- 5 db of attentuation on your transmitter.
Any amateur radio club or RT installer should be able to give you the
appropriate values to use. The ARRL (American Amateur radio league)
published stuff in their hand book about this.
Modifying your transmitter is tricky because it could upset the internal
tuning of it... making it unstable. Also make sure there is no external
controls for adjusting power... not sure how adding aerial attenuation
fits into this rule.
Cheers
Geoff Barkman

Michael Rowse wrote:
> Heya guys,
>
> Anybody got any bright ideas on how to reduce the signal coming out of
> the back of the transmitter? We have a one watt transmitter but wish
> to reduce it down to approx 300mW so as not to interfere with another
> close station. (we are going to be using this TX as a link system)
> Would some kind of attenuator do the trick or is there another method?
> The cheaper the better.
>
> Thanks in advance
> Mike
>
>
>
> ------------------------------------------------------------------------
>
>

Heya guys,

Anybody got any bright ideas on how to reduce the signal coming out of
the back of the transmitter? We have a one watt transmitter but wish
to reduce it down to approx 300mW so as not to interfere with another
close station. (we are going to be using this TX as a link system)
Would some kind of attenuator do the trick or is there another method?
The cheaper the better.

Thanks in advance
Mike

Obviously I spoke too soon.

When I got back to Auckland on Sunday I tuned in to TLC hoping to hear Country
Music and for a large part of my transmission  area I was being overridden
again.

Tried again tonight and the same.

So if any body can help track this transmitter down I would be grateful.

I haven't heard any audio from it as yet.

Drove round Panama Rd area and on up to Otahuhu to see what I could hear.

My signal has been greatly weaken over much of this area.

Robert
TLC Radio 107.7 Otahuhu

On 4 Feb 2008 at 20:10, Robert S Dew wrote:

> Amazingly the problem has gone away for the moment
>
> On 4 Feb 2008 at 18:18, Michael Rowse wrote:
>
> > Hey Robert,
> >
> > We are in Howick and have been noticing the same thing occasionly. We are
also
> > on 107.7 as you know and as far as I am aware have never caused you too much
> > drama in the almost 3 years that we have been on air. Could it possibly be
> > from Pakuranga college on 107.6?
> >
> > Mike
> > Valdus Radio 107.7 Howick
>
>
> Robert S Dew
> FreeWheelingNZ.com Tours
> 4SightSeeing Information & Bookings
> Britomart Transport Centre
> 12 Queen St
> Auckland
>
>
>



Robert S Dew
FreeWheelingNZ.com Tours
4SightSeeing Information & Bookings
Britomart Transport Centre
12 Queen St
Auckland

--- In LPFM_Radio@..., "marday2" <marday@...> wrote:
>
> --- In LPFM_Radio@..., "piratefm2007"
> <piratefm2007@> wrote:
> >
> > hi all, this is to inform that we are erecting a antenna tower on
the
> > waitakere ranges, it will give us fairly much total west ak
coverage on
> > 88.1 and pockets of reception elsewhere, i hope this does not cause
any
> > problems to you all, thx andy archer piratefm
> >
> Hi Andy,
> You do realise that you are stomping on at least 3 established
> stations in West Auckland on 88.1 MHz ?
> DaveD
>
hi daved, no i did not know that, i cant hear them from my transmitter
site, so ive deemed the frequency as clear, thx andy

--- In LPFM_Radio@..., "piratefm2007"
<piratefm2007@...> wrote:
>
> hi all, this is to inform that we are erecting a antenna tower on the
> waitakere ranges, it will give us fairly much total west ak coverage on
> 88.1 and pockets of reception elsewhere, i hope this does not cause any
> problems to you all, thx andy archer piratefm
>
Hi Andy,
You do realise that you are stomping on at least 3 established
stations in West Auckland on 88.1 MHz ?
DaveD

Amazingly the problem has gone away for the moment

On 4 Feb 2008 at 18:18, Michael Rowse wrote:

> Hey Robert,
>
> We are in Howick and have been noticing the same thing occasionly. We are also
> on 107.7 as you know and as far as I am aware have never caused you too much
> drama in the almost 3 years that we have been on air. Could it possibly be
from
> Pakuranga college on 107.6?
>
> Mike
> Valdus Radio 107.7 Howick


Robert S Dew
FreeWheelingNZ.com Tours
4SightSeeing Information & Bookings
Britomart Transport Centre
12 Queen St
Auckland

There is a transmission some where to the east of me that is killing my signal
in my weaker areas.

Possible coming from Pakuranga area.

There is no audio.

Anybody got ant suggestions where it might be coming from.

Robert
TLC Radio 107.7 Otahuhu



Robert S Dew
FreeWheelingNZ.com Tours
4SightSeeing Information & Bookings
Britomart Transport Centre
12 Queen St
Auckland

Posted for the record and FYI, the following email sent to Peter Casey
(Radio Broadcaster's Association) and Aaron Olphert (Kiordia).

Note that a photographic record of the evening was made, and it is
hoped to make this available sometime in the near future.

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++
To: Peter Casey <PeterCasey@...>, Aaron Olphert
<Aaron.Olphert@...>
Subject: A sincere thank you from The Society Of Low Power FM
Broadcasters Incorporated
From: P R Shaw
Date: Mon, 28 Jan 2008 16:59:08 +1300
Cc: LPFM Group1, Chris Brennan <Chris.Brennan@...>
[Sent to 133 recipients]
--------
Dear Peter and Aaron,

Time has passed extremely quickly since we held our presentation
evening at which you were the welcome guests of The Society Of Low
Power FM Broadcasters Incorporated.

We hope you have had a good holiday break over Christmas and the New
Year, and like most of us, I am sure you are right back in the thick
of things again.

Your extremely interesting, informative and entertaining coverage on
the subject digital radio broadcasting in New Zealand, held on the
evening of Tuesday 11th December 2007, was absolutely superb and much
appreciated by all present. You gave a great overview, answered all
questions capably (and there were quite a few of these) and the
practical demonstration was a real eye opener to many of us.

On behalf of The Society, I would like to thank you both for putting
in the time and effort to come along to make the evening so worth
while for us all.

We shall watch with great interest developments in this exciting new
field of radio broadcasting.


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


On Thu, 06 Dec 2007 00:25:00 +1300, you wrote:

>To all LPFM people
>==================
>
>Here is a reminder to all you good folk that The Society Of Low Power
FM Broadcasters Incorporated will host Peter Casey, Senior Development
Engineer, The Radio Network Ltd, who will run a PRESENTATION AND
DEMONSTRATION evening showcasing the HD Radio trial currently being
carried out by RBA, for ALL interested folk.
>
>But it gets better now...
>
>Aaron Olphert, Network Services, Business Manager, Kordia(Tm), has
written:
>
>>I'm the Business Manager at Kordia responsible for the marketing,
strategic and business development roles around the introduction of
digital radio in NZ.
>>
>>I just wanted to clarify that Kordia is operating the current DAB
trial in Auckland and Wellington and the RBA the HD trial in Auckland.
I'm not sure whether Peter C is going to only talk on his trial or
about DAB as well.
>>
>>If you need the up to date information on what is happening with the
DAB trial in New Zealand and around the world please let me know.
>
>Kordia Website: http://www.kordia.co.nz/ and www.kordiasolutions.com
>More information: http://en.wikipedia.org/wiki/Kordia
>This is worth a read.
>
>We are very pleased to announce that Aaron will now co-host the
evening with Peter Casey, which will greatly increase the scope of the
presentation. Not only will you find out all about this new cutting
edge technology - a complete overview, but Peter is going to
demonstrate the medium with his digital equipment and a good sound
system. It should be very interesting.
>

---SNIP---

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

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

PRACTICAL WORKSHOP: BUILD YOUR OWN J-POLE ANTENNA
=================================================

The Society Of Low Power FM Broadcasters Incorporated is holding a
practical workshop evening at which registrants will build, tune and
test their own J-Pole antenna.

*** You will BUILD, TEST and TUNE a J-Pole antenna to the frequency of
your choice, and take it away with you

*** all materials and the tools with which to build the device will be
supplied

*** RG58CU coax will be supplied for the tail which you will terminate
in a PL259 plug. There would be a total of about 2 metres of coax,
part of which would form the BALUN, leaving approximately 750 for the
"tail". If you wish to use an alternative connection, such as an N
connector, then that is possible, but you will need to advise us, and
there will likely be a price differential

*** Your hosts will be Les Dixon and Dave Dingley, both well
experienced in this field


+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
When?: Tuesday 19th February 2008 at 7:30 pm

Where?: The Auckland VHF (Branch 66) Clubrooms in Mount Roskill

What do you need to participate?: Register and pay in advance
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

If you would like to participate, you need to REGISTER. Reply to this
email and details will be sent to you. All you will need to do is to
turn up on the evening, prepared to do a bit of practical work.

We already have FOUR members registered, with room for a FEW more. So
if you're keen, I suggest you respond quickly.


COST:
Society Members: $40.00
Non-members:     $68.00

NOTE: this is essentially AT COST.


About J-Poles
=============

J-Pole antennas have proved to popular with many LPFM operators for a
number of reasons. They are said to radiate more downwards than up
into space, and are more compact. Here is some information...

from http://en.wikipedia.org/wiki/J-pole:

The J-pole antenna, also called the Zepp' antenna (short for
Zeppelin), was first invented by the Germans for use in their lighter
than air balloons. Trailed behind the airship it consisted of a
quarter wave one half wave. This was later modified into the J-Pole
configuration popular with Amateur Radio hobbyists.

The J-pole antenna is an end-fed omnidirectional dipole antenna that
is matched to the feedline by a quarter wave transmission line stub.
Matching to the feed-line is achieved by sliding the connection of the
feedline back and forth along the stub until an VSWR as close as
possible to 1:1 is obtained. Since this is a half-wave antenna, it
will exhibit gain over a quarter-wave ground-plane antenna. The J-pole
is somewhat sensitive to surrounding metal objects, and should have at
least a quarter wavelength of free space around it.


from
http://www.radio-electronics.com/info/antennas/j_antenna/j_pole_antenna.php

The J or J pole antenna has found favour in many applications. The J
antenna has a number of advantages over the standard vertical antennas
such as the quarter wavelength vertical antenna and the five eights
wavelength antenna. Unlike the other vertical antennas just mentioned,
the J pole antenna does not require radials for its operation. In
applications where radials may appear unsightly or where they may not
be suitable for other reasons, the J pole antenna provides a useful
alternative. Additionally its length means that the J pole antenna
also provides some gain over a normal quarter wavelength vertical.


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

we will have some space spare on our tower on the waitaks, we could
host 1 or 2 LPFM stations on the tower as long as they do not use 88.1,
contact me for info, thx andy piratefm

hi all, this is to inform that we are erecting a antenna tower on the
waitakere ranges, it will give us fairly much total west ak coverage on
88.1 and pockets of reception elsewhere, i hope this does not cause any
problems to you all, thx andy archer piratefm

Hi,

Umm soooo we're reincarnated and kicking again after the 3 month
silence..

106.7 = moshbox! Please let us know about any interferences or
complaints through a pain and trouble free call line 0800iamepic and
follow the easy 2 hour voice prompts.

Nah, just come over and beat the hell out of us or SPAM moshboxradio@
gmail.com

Thanks and luv u! Will post pics of the neeeewb studio soon!

:)
Kermy $$ Cath
MoshBox Radio 106.7

MoshBox Radio East Auckland:

Hey LPFM community!

After months of frustration, frequency congestion and many
annoyances, we've fianlly found a spot in Howick side to go live
(soonish).

So that we dont have to go back to choosing a frequency for the third
time, and if your station is either side of 106.7 in Howick or East
Auckland, please comment so we know who our new neighbours are, and
we'll introduce ourselves as the new kids on the block.

If your station is in fact on 106.7 in East Auckland, it would be
nice to know we've just stepped on another persons toes :p

Suspecting radio stations around us:

106.8 -->KFM active?? Cant pick you guys up...
106.9 -->KFM again? If you guys see this or pick us pick, comment
back or email moshboxradio@...

Word.

MoshBox radio 106.7

Kermath & Cath

we are onair finally, west ak

I have found a reference on the following web site
(http://www.thex.co.nz/nz40.html) to a 'Neon FM' broadcasting on
107.1FM in West Auckland which may be the culprit. Does anyone know
of or have any contact details for a 'Neon FM'.

I am still yet to hear any contact details or even station
identification broadcast on the station that has been effecting our
transmission.

Cheers

Dan

--- In LPFM_Radio@..., "danieltatenz"
<danieltatenz@...> wrote:
>
> It has been breaking up and overpowering our signal in Titirangi,
New
> Lynn, Kelston, and parts of Blockhouse Bay. I was also on the shore
> at the weekend and it could be heard clearly in Birkenhead.
>
> I am not sure what part of Akld that this signal originates from,
> which is what I am trying to ascertain, along with the contact
> details of the operator.
>
> Cheers
>
> Dan
>
> --- In LPFM_Radio@..., "Richard Phelps" <richard@>
> wrote:
> >
> > Hi Dan - where specifically in Auckland?
> >
> > --- In LPFM_Radio@..., "danieltatenz"
> > <danieltatenz@> wrote:
> > >
> > > Does anyone know who has started the new Muzak (light jazz/
> elevator
> > > music) station that has started broadcasting on 107.1 in Akld
> over the
> > > past couple of weeks.
> > >
> > > I have listened but have not heard any station ID's or contact
> > > information broadcast.
> > >
> > > Regards
> > >
> > > Dan
> > >
> >
>