HI Matt
A few things to look at:
Output purity of the repeater
Possible addition of some higher Q cavities to reduce sideband noise etc.
( an isolator ahould be on the TX output prior to the duplexer or output
cavity/antenna )
Check proximity to the RCAG site where the QRM is getting in to the FAA's
radio ( if this is the case ).
Maybe an inspection for dissimilar metals - non-linear junctions near the
Repeater ant. which may be generating some
"products".
If the FAA heard the "bad audio guy" only maybe his transmitter(s) is/are
overdeviating.
Ocasionally we get this type of call from an "Entity" claiming some
interference from a comercial repeater of ours which when checked is usually
attributed to some finite failure of a mobile etc.
Anyway a few ideas - - - - good luck
Ed K9QPJ
Com/Rad Inc.
Des Plaines, IL
----- Original Message -----
From: "Mathew Quaife" <[EMAIL PROTECTED]>
To: <Repeater-Builder@yahoogroups.com>
Sent: Friday, June 17, 2005 10:10 PM
Subject: [Repeater-Builder] Help, repeater output heard on Aircraft Band
> I need some input, not critisism or what I should do, as I know what
> to do. The other night a user was on the system, his audio was
> extremely bad into the system, his wife used the same radio and her
> audio was just as bad. All other users of the system sounded just
> fine. Two days later he received a phone call from the FAA stating
> his transmission could be heard on 135.92 if I remember what he told
> me, as he did not email me the frequency. At any rate, this evening
> I did some test with my mobile Icom 706 about 3 miles from the
> repeater. Having a few users carry on a conversation, I could hear
> the output of the repeater at 132.750 to 132.850, most output at
> 132.800 Mhz. In the FM mode, voice was detected, but distorted, in
> the AM mode, voice was very intelligle, as was the repeater id'er.
> >From what I was told, the FAA informant advised he could hear a
> conversation, but was able to pick out the audio of the user with the
> bad audio, for which at the time, we was trying to isolate his audio
> problem. Other than taking the repeater down, which is what will
> happen here very shortly to prevent interference with Aviation, what
> might be happening? Any thoughs or suggestions. It will not be
> until Sunday that I can get to look at the system on the SA. Thanks.
>
>
> Mathew
> W9MWQ
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> Yahoo! Groups Links
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