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Reply | Forward Message #3473 of 6098 |
Re: [LPFM] Aerial Tuning

Hi Allen, Give me a ring and I will definitely assist you in this. Although
the band does seem awfully crowded with silly things like rebroadcasting
morefm on a lpfm freq. when the wellington freq. is recieved clear as, the
same with southern star and at least 1 freq. that for many weeks now has
only been a carrier signal with no broadcast at all.

Some of the power outputs from these stations just have to be questionable
as even the inspector from RSM was concerned that he could pick these up
stations from the elevation in Picton which at least 27 Km's from the
nearest of these lpfm tx's and in hilly terrain.

I believe that many of these stations may be being setup by a commercial
radio and television operator from Nelson who it would appear seems to want
to tie up all the lpfm freq.that they can. One could speculate why but....
You have been broadcasting, with limited range on 88.4 for some years now.

Although the gurl is on a shared basis you would think that those
responsible would at least be courteous enough to check?

However I will get a decent aerial for you and play their game!

For those on this list this that have encountered this scenerio before it
may seem that I am bleating.

Frankly what is happening in Blenheim on one hand is of no great concern to
me because I don't live or broadcast there but on the other hand it causes
me great concern, for when I was audited a few
weeks back the inspector did express his concern at the apparant and blatant
flouting of the regs and RSM's concerns about how much time is spent having
to deal with it and what any responces or recomendation (changes) that they
might impose in the future. I got the distinct impression that if it can't
be sorted then this is a very real chance that we will loose it.

M.B D


----- Original Message -----
From: "Allan Udy" <allan@...>
To: <LPFM_Radio@...>
Sent: Thursday, March 03, 2005 1:14 AM
Subject: Re: [LPFM] Aerial Tuning


>
> Hi Maurice,
>
> >Also does anyone on the list now who is responcible for the Blenheim
> >transmision taking up 88.6/7&8 and calling themselves Sunshine 88.7fm.
> >It seems that sleepy old Blenheim is getting crowded like Auckland
>
> Did you have any luck with this?
>
> Just wondering if you can help.... if you can't, or don't have time,
> I'd really appreciate it if you could let me know.
>
> 1. My NRG transmitter is tuned to 88.4. It's currently being stomped
> on by someone else, and so without having an aerial, it's even
> pointless having the thing turned on -- the signal is just too awful
> to listen to.
>
> I need to re-tune the Tx to another frequency. Can you help?
>
>
>
> 2. I still have the aerial that you built for someone else, prior to
> the 2003 airshow. You may recall I tried it out here after the
> airshow, but it caused significant TV interference. I think you said
> at the time it was because the aerial was not setup for this
> particular Tx/frequency....?
>
> Do you want this aerial back? It's sitting in my shed and is of no use to
me.
>
>
>
> 3. Obviously we have another airshow coming up very soon (Easter).
> It would be excellent if we could use my Tx for the show again, with
> a good aerial that would give us some useful coverage.
>
> Can you help?
>
>
>
> In short, what I really need is:
>
> a. The Tx re-tuned to a frequency that is not being used by someone
> else here in Blenheim (either low or high in the FM band -- doesn't
> bother me).
>
> b. I need an aerial made specifically for this Tx/frequency so that
> it will perform well without interfering with TV signals etc, and
> will give me some coverage so that I can 'have' a local LPFM freq.
> Obviously the fact that I was not broadcasting widely on 88.4 allowed
> the other operator to step in and assume that frequency was unused.
>
> c. For this to be done in the next fortnight....
>
>
> At the moment the Tx is witched off -- as above, it's currently
> unusable for me. I'd be willing to bring it out to Seddon for you to
> have there if you think you would be able to help me in time for the
> airshow etc. I'm also willing to pay, as I've previously noted.
>
> Would be good if you could let me know your availability to help. At
> this stage if I can't get something sorted out soon, I'm going to
> have no choice but to sell the Tx to someone who can make better use
> of it than I can (with my zero radio skills).
>
> Cheers,
> Allan
>
> --
> Allan Udy - Software Development, Video & VR Production
> http://www.golden.co.nz and http://www.virtualnz.co.nz
> Golden Micro Solutions, Box 590, Blenheim, New Zealand +64-3-5788227
>
>
> By the time they had diminished from 50 to 8, the other dwarves began
> to suspect 'Hungry' ... -- Gary Larson, The Far Side
>
>
>
>
>
>
>
> ---------------------------------------------------------
> LPFM Website: http://au.groups.yahoo.com/group/LPFM_Radio
> Yahoo! Groups Links
>
>
>
>
>
>
>
>




Wed Mar 23, 2005 12:01 pm

DuffyFamily@...
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Forward
Message #3473 of 6098 |
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Hi Group a quick tech ? When trimming a 5/8 wave whip aerial (Either changing Freq. or for better SWR) is the toal length, from the base of the whip or from...
M.B & J.D Duffy
DuffyFamily@...
Send Email
Nov 13, 2004
7:58 pm

Hi MB, I'm sure one of our members will give you the direct answer to your question, but this also leads to the indelicate subject of "common practice" among...
John Peterson
johnfp3
Offline Send Email
Nov 13, 2004
10:34 pm

I know of one LPFM operator using a stacked dipole... surely that has more gain than a 5/8 whip even. ... Cheers Geoff Barkman ZL4TUX -- And now for the...
Geoff Barkman
Mad_Milkie
Offline Send Email
Nov 14, 2004
8:17 am

Antennas I'm familiar with have the following 'gains': Stacked Dipole: 3.7 dBi 5/8 vertical whip: 4.8 dBi But I suppose a lot of it comes into the design and...
Mix FM
mix_fm_welli...
Offline Send Email
Nov 14, 2004
10:08 am

... hi all, why bother with a vertical whip, 95% of all fm radio stations use slant polarisation, thats why they use dipoles, either folded or 75ohm impedence,...
andy roberts
piratefm2001
Offline Send Email
Nov 14, 2004
1:30 pm

Greetings all! I prefer and use a folded dipole because it has a relatively wider bandwidth and this makes tuning it and matching into it a little less...
Brian Gallagher
brianislay
Offline Send Email
Nov 14, 2004
8:25 pm

So much angst for such a simple ? Not that I need to justify myself but! I run a 1 watt nrg pro 3 through 20mtrs rg213 and a 1/2 wave folded dipole. As per my...
M.B & J.D Duffy
DuffyFamily@...
Send Email
Nov 14, 2004
7:27 pm

But there's no real advantage, if the operator has adjusted the Tx power so that the EIRP is the same. A stacker dipole flattens out the vertical pattern, so...
Jochen Siegenthaler
jochensiegen...
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Nov 14, 2004
8:14 pm

Well said, Jochen, The real point I was trying to make is that there are (I believe) a number of operators who knowingly flaunt the rules, and with minimal RSM...
John Peterson
johnfp3
Offline Send Email
Nov 14, 2004
8:30 pm

Hey Jochen, I was just counting my lucky stars last night with all this wind and lightning over Manukau. My J-Pole is high up Manukau Heights where its 'gale...
Richard Phelps
customcuts_nz
Offline Send Email
Nov 15, 2004
1:23 am

Of course the joy of not changing your freq is that you will also be splattering his coverage - a bit of schadenfruede always makes you feel good. Bu tthen if...
Jochen Siegenthaler
jochensiegen...
Offline Send Email
Nov 14, 2004
8:17 pm

Exactly, because at the end of the day a pure isotropic antenna is the best for LPFM. Now, I wonder if I can find that in the RFS catalogue..... Jochen ... ...
Jochen Siegenthaler
jochensiegen...
Offline Send Email
Nov 14, 2004
8:36 pm

Jochen, I gather that everyone, including RSM, have agreed to ignore "isotropic" in eirp? My understanding that the change in eirp in the rules a year ago was...
John Peterson
johnfp3
Offline Send Email
Nov 14, 2004
8:43 pm

I recall it was something like that, but the increase was intentional - to allow all and sundry to keep their existing setup and be compliant Jochen ... ...
Jochen Siegenthaler
jochensiegen...
Offline Send Email
Nov 14, 2004
8:55 pm

Can you imagine climbing a 100m-high lattice tower - that's around 25 storeys, on a ladder, straight up - on the top of a 1000m-high mountain - where it's...
Jochen Siegenthaler
jochensiegen...
Offline Send Email
Nov 15, 2004
1:43 am

Not changing freq. is obviously an option, albiet nasty? Some months back I posted an email that I was going to be operating multiple tx's around my local...
M.B & J.D Duffy
DuffyFamily@...
Send Email
Nov 15, 2004
2:23 am

... I think these would come under the same regulations as LPFM so you couldn't have more than 2 within 25km. I think the general licence allows radiation of...
Ross Levis
rosslevis
Offline Send Email
Nov 15, 2004
3:51 am

Having just checked the gurl for low power devices such as I am using I am now confused. The allowable and usable freq. is 107 to 108 mhz, maximum output ...
M.B & J.D Duffy
DuffyFamily@...
Send Email
Nov 15, 2004
7:35 pm

There are 2 GURLs for FM use: The very low power one for short range devices such as wireless microphones, iPod transmitters, etc, which is here: ...
Jochen Siegenthaler
jochensiegen...
Offline Send Email
Nov 15, 2004
7:46 pm

Nope, different GURL. The 25mW one is for Short Range Devices, see here: http://www.med.govt.nz/rsm/licensing/gurls/gurl-srd.html Jochen ... I think these...
Jochen Siegenthaler
jochensiegen...
Offline Send Email
Nov 15, 2004
7:47 pm

Note that the 25mw Short Range Devices GURL also states: 5. Transmissions for the purposes of broadcasting, as defined in the Broadcasting Act 1989, are not...
Matt Camp
mattcampnz
Offline Send Email
Nov 15, 2004
7:54 pm

Still doesn't explain the cross over in Freq. Also does anyone on the list now who is responcible for the Blenheim transmision taking up 88.6/7&8 and calling...
M.B & J.D Duffy
DuffyFamily@...
Send Email
Nov 16, 2004
1:06 am

Hi Maurice, ... Did you have any luck with this? Just wondering if you can help.... if you can't, or don't have time, I'd really appreciate it if you could let...
Allan Udy
allan@...
Send Email
Mar 3, 2005
6:15 am

Hi all, ... Whoops - private email to public list! What a fool I feel .... ;-) Sorry guys. cheers, Allan...
Allan Udy
allan@...
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Mar 3, 2005
6:24 am

Hi Brian.. Are you ex NZBC ? Dave ... Watch movie trailers and listen to music online with the Xtra Broadband Channel !...
Dave Smith
radiopegasus@...
Send Email
Nov 16, 2004
7:50 am

Hello Dave. Why yes,I am ex NZBC/BCNZ/RNZ,you name it1 Do I know you? Cheers Brian. ... Hi Brian.. Are you ex NZBC ? Dave ... if ... cause ... fm ... EFFECTIVE...
Brian Gallagher
brianislay
Offline Send Email
Nov 16, 2004
8:05 am

FYI, I am selling my trusty old VSWR meter on TradeMe Works up to 150MHz, ideal for LPFM aerial tuning See ...
Jochen Siegenthaler
jochensiegen...
Offline Send Email
Nov 16, 2004
7:23 pm

Yes we did...66-70.. Please contact me at - radiopegasus@... Many thanks Dave ... Surf the net and talk on the phone with Xtra JetStream!...
Dave Smith
radiopegasus@...
Send Email
Nov 17, 2004
3:49 am

--Hi DaveHot mail already sent Brian- Dave Smith <radiopegasus@...> wrote:H ... Yes we did...66-70.. Please contact me at - radiopegasus@... ...
Brian Gallagher
brianislay
Offline Send Email
Nov 17, 2004
7:48 pm

Hi Allen, Give me a ring and I will definitely assist you in this. Although the band does seem awfully crowded with silly things like rebroadcasting morefm...
M.B & J.D Duffy
DuffyFamily@...
Send Email
Mar 4, 2005
12:10 am

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