At 2/23/2010 17:16, you wrote:
>Mark et al,
>Yes, this repeater is using the Motorola T1500 series bandpass cavities
>(two each for rx and tx). I've tried running rx and tx both duplex and
>seperate (borrowing a nearby antenna with permission). I can hear the
>interference underneath my signal when
ter-
> buil...@yahoogroups.com] On Behalf Of KT9AC
> Sent: Wednesday, February 24, 2010 4:42 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re: [Repeater-Builder] Re: Can the 4th harmonic of 1250 AM keep
> UHF repeaters locked up?
>
> If it was just audio then there wo
If it was just audio then there would be no feedback of the PL/DPL
tones, keeping the repeater locked up.
Good advice though.
Jeff DePolo wrote:
>
> >
> > On 2/23/2010 3:11 PM, Jim WB5OXQ inb Waco, TX wrote:
> > > Is it possible the AM signal is getting into an audio stage
> > instead of the
> >
>
> On 2/23/2010 3:11 PM, Jim WB5OXQ inb Waco, TX wrote:
> > Is it possible the AM signal is getting into an audio stage
> instead of the
> > receiver front end? I had that happen once.
> >
> Same here. All audio inteconnects are now tiny coax cables at
> that site
> now, installed with sh
On 2/23/2010 3:11 PM, Jim WB5OXQ inb Waco, TX wrote:
> Is it possible the AM signal is getting into an audio stage instead of the
> receiver front end? I had that happen once.
>
Same here. All audio inteconnects are now tiny coax cables at that site
now, installed with shield grounded at ONE
How long is your feed line? Do you have any toriods on your feed line, where it
comes in your shack?
> To: Repeater-Builder@yahoogroups.com
> From: kt...@ameritech.net
> Date: Tue, 23 Feb 2010 16:01:45 -0600
> Subject: Re: [Repeater-Builder] Re: Can the 4th harmonic of 1250
er@
> yahoogroups. com <mailto:Repeater-Builder%40yahoogroups.com>] On
> Behalf Of KT9AC
> Sent: Wednesday, 24 February 2010 09:02 AM
> To: Repeater-Builder@ yahoogroups. com
> <mailto:Repeater-Builder%40yahoogroups.com>
> Subject: Re: [Repeater-Builder] Re: Can the 4t
If you wouldn't mind...that would be interesting to see how it works.
DCFluX wrote:
>
> How about 1.25 MHz RF coming down the outer jacket of the UHF antenna
> and into the ground of the system? You have about 200 ft or so of
> coax? Try a mag mount antenna temporarily.
>
> Not really sure how yo
ark VK3BYY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of KT9AC
Sent: Wednesday, 24 February 2010 09:02 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: Can the 4th harmonic of 1250 AM keep UHF
re
m] On Behalf Of DCFluX
Sent: Wednesday, 24 February 2010 09:35 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Re: Can the 4th harmonic of 1250 AM keep UHF
repeaters locked up?
How about 1.25 MHz RF coming down the outer jacket of the UHF antenna
and into the ground of
How about 1.25 MHz RF coming down the outer jacket of the UHF antenna
and into the ground of the system? You have about 200 ft or so of
coax? Try a mag mount antenna temporarily.
Not really sure how you'd cure that though. Not sure if snap on RF
beads would work on coax with a signal going in the
> I'm considering an ICE broadcast high-pass filter that cuts off at
> 1.8Mhz (model 402). I have an email into them to see how well
> it might
> work at 448 Mhz.
>
> Tony
Before you spend any "real money", you might just try a shorted quarterwave
stub. If you want, I can make one up quick an
Is it possible the AM signal is getting into an audio stage instead of the
receiver front end? I had that happen once.
- Original Message -
From: "KT9AC"
To:
Sent: Tuesday, February 23, 2010 4:01 PM
Subject: Re: [Repeater-Builder] Re: Can the 4th harmonic of 1250 A
I was able to match up the audio coming through the repeater and the
local AM station. My latest theory is that their signal is so strong
that its blowing into the receiver's front end and multiplying/mixing
there (past the bandpass filters and all). They are heterodyne receivers
after all.
I'
A lot of strange things can happen.
We had a situation where a school bus control station that was situated a
couple blocks from an FM broadcast tower caused the control station to spur
and get into our control station almost 20 miles away. When the offending
control station was put on the benc
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