[Repeater-Builder] Re: Weird Interference between APRS and 2-M repeater help needed

We had a similar problem using a Kenwood radio with switching or pin diodes that was on APRS. The repeater and the APRS radio were on DB224's very close to each other. The repeater has 6 cans and the aprs had 1 band pass can. Neither system interfered with the other but we soon discovered we wer

RE: [Repeater-Builder] Re: Weird Interference between APRS and 2-M repeater help needed

] Re: Weird Interference between APRS and 2-M repeater help needed <I am a firm believer that anyone who deploys ANY transmitter on a mountaintop (or any multi transmitter site) should be shot. <---Darn it.. What I meant is that I am a firm believer that anyone who deplo

RE: [Repeater-Builder] Re: Weird Interference between APRS and 2-M repeater help needed

> The repeater might be getting into the PA stage of the APRS > radio. Try > powering off the APRS radio during the time that you hear the weird > noise. I would bet that the noise goes away as soon as the APRS radio > in powered off. What kind of radio is being used for APRS? If it's someth

Re: [Repeater-Builder] Re: Weird Interference between APRS and 2-M repeater help needed

At 04:40 PM 11/2/2009, Joe wrote: > > >The repeater might be getting into the PA stage of the APRS radio. Try >powering off the APRS radio during the time that you hear the weird >noise. I would bet that the noise goes away as soon as the APRS radio >in powered off. <---Power is irrelevant as the

Re: [Repeater-Builder] Re: Weird Interference between APRS and 2-M repeater help needed

Jason Parks wrote: > Noise and desense are one thing, but the popping and crackling when trying to > hook the antenna to a powered > off radio, I'm assuming that the popping and crackling that you are hearing is on the active repeater? If so, that is what one can expect if you change things i

Re: [Repeater-Builder] Re: Weird Interference between APRS and 2-M repeater help needed

Thanks for the input. I missed a couple critical pieces of information. The FM Voice repeater is running through a 6-cavity duplexer. The APRS setup had a single cavity, tuned to the 144.39 APRS frequency. I am assuming this single cavity is acting as a low pass filter to prevent the voice repe

[Repeater-Builder] Re: Weird Interference between APRS and 2-M repeater help needed

Thanks for the input folks! I missed a couple critical pieces of information that are about to get me shot! ;-) Our FM Voice repeater is running through a 6-cavity duplexer. The APRS setup had a single cavity, tuned to the 144.39 APRS frequency. I am assuming this single cavity is acting a

Re: [Repeater-Builder] Re: Weird Interference between APRS and 2-M repeater help needed

I guess there are some sites noisy enough that losing 30 dB wouldn't affect S/N... ;^) - Original Message - From: skipp025 To: Repeater-Builder@yahoogroups.com Sent: Monday, November 02, 2009 4:29 PM Subject: [Repeater-Builder] Re: Weird Interference between APRS an

[Repeater-Builder] Re: Weird Interference between APRS and 2-M repeater help needed

> losses? I've never tried it... > - Original Message - > From: David > To: Repeater-Builder@yahoogroups.com > Sent: Monday, November 02, 2009 1:31 PM > Subject: [Repeater-Builder] Re: Weird Interference between APRS and 2-M > repeater help needed

[Repeater-Builder] Re: Weird Interference between APRS and 2-M repeater help needed

Re: [Repeater-Builder] Re: Weird Interference between APRS and 2-M repeater help needed

2009-11-02 Thread Paul Plack

And even then, the circulator was only active on the transmit side, right? - Original Message - From: Oz-in-DFW To: Repeater-Builder@yahoogroups.com Sent: Monday, November 02, 2009 4:18 PM Subject: Re: [Repeater-Builder] Re: Weird Interference between APRS and 2-M repeater

[Repeater-Builder] Re: Weird Interference between APRS and 2-M repeater help needed

2009-11-02 Thread Ken Arck

At 12:31 PM 11/2/2009, David wrote: > > >Most people used a simple mobile for aprs which creates alot of >headaches where several transmitters are used. They just dont have >the filtering needed for this application. You should also use a >circulator on your aprs radio. This will help keep RF ou

Re: [Repeater-Builder] Re: Weird Interference between APRS and 2-M repeater help needed

2009-11-02 Thread Oz-in-DFW

Only on UHF. VHF was a lowpass filter. Kris Kirby wrote: > > > On Mon, 2 Nov 2009, dep...@starband.net > wrote: > > > I believe you are right. Simplex is difficult with a circulater. > > > > Can you receive through a circulator without heavy losses? I've never > >

Re: [Repeater-Builder] Re: Weird Interference between APRS and 2-M repeater help needed

2009-11-02 Thread Kris Kirby

On Mon, 2 Nov 2009, dep...@starband.net wrote: > > I believe you are right. Simplex is difficult with a circulater. > > Can you receive through a circulator without heavy losses? I've never > > tried it... Older Micor mobiles had a built-in circulator and a T/R relay. -- Kris Kirby, KE4AHR Disin

Re: [Repeater-Builder] Re: Weird Interference between APRS and 2-M repeater help needed

2009-11-02 Thread depley

Sent: Monday, November 02, 2009 1:31 PM > Subject: [Repeater-Builder] Re: Weird Interference between APRS and > 2-M repeater help needed > > > First of all you do not have enough isolation between antennas with > only two wavelenghts horizonal seperation. A single bandpas

Re: [Repeater-Builder] Re: Weird Interference between APRS and 2-M repeater help needed

2009-11-02 Thread DCFluX

; Can you receive through a circulator without heavy losses? I've never tried > it... > > > - Original Message - > *From:* David > *To:* Repeater-Builder@yahoogroups.com > *Sent:* Monday, November 02, 2009 1:31 PM > *Subject:* [Repeater-Builder] Re: Weird Interf

Re: [Repeater-Builder] Re: Weird Interference between APRS and 2-M repeater help needed

2009-11-02 Thread Paul Plack

Can you receive through a circulator without heavy losses? I've never tried it... - Original Message - From: David To: Repeater-Builder@yahoogroups.com Sent: Monday, November 02, 2009 1:31 PM Subject: [Repeater-Builder] Re: Weird Interference between APRS and 2-M rep

[Repeater-Builder] Re: Weird Interference between APRS and 2-M repeater help needed

2009-11-02 Thread David

First of all you do not have enough isolation between antennas with only two wavelenghts horizonal seperation. A single bandpass cavity will not be enough. I would try 2 bandpass/bandreject cavities. Reject set for the TX freq and the other set for the RX freq. I believe that RF from your repeat