Mike,
If it moves around based on time of day, my first guess is a PA that's gone
bad, and has a parasitic that's temperature-related.
If you've tracked an individual spur drifting 70 kHz up the band during a
single transmission, this is not some (intentional) oscillator drifting, but
some combination of failed components or tuning which has produced a parasitic.
Sorry to say, but a paging transmitter owner swearing his stuff is clean is
pretty meaningless. The assumption in his industry is the professionals who
maintain his stuff are not the problem, it's "those damn hams." Sadly, it may
more often be the other way around these days, as companies maintaining paging
equipment have transitioned to underpaid, under-trained card-swappers instead
of component-level technicians with a clue about RF systems.
73,
Paul, AE4KR
----- Original Message -----
From: Mike
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, October 28, 2009 12:28 PM
Subject: [Repeater-Builder] Pager Interference to 2-meter & VHF Public
Service Band
A couple of weeks ago, our repeater system started to experience
interference from a paging system...
...one evening I tracked it from about 145.120 to 145.190 as it swept through
each transmission...
.
