[Scan-DC] Fairfax Dispatch - 460.575

[Shawnerz]

Randy,
I don't monitor the system, but there are a couple
possibilities:
1.  It could be interference.  For whatever reason,
the base station "sees" the interference (intermod,
adjacent channel, whatever) as a valid signal and is
repeating it.  In the scenario, the system controller
would show the repeater as busy and it would not be
availible for use while the interference is active.
2.  It could encrypted traffic and you're hearing the
encrypted output.
3.  It's analog SCADA (Station Control And Data
Automation) traffic.  For example, in Montgomery
County, they use SCADA units to report water well
alarms, flow rates and stuff like that.  The units
have their own talkgroup and the demodulated audio
resembles static to the untrained ear.

I hope that helps.
-Shawn
--- Randy Benn <randybenn at gmail.com> wrote:

> I've recently been monitoring FFX dispatch on their
> conventional freq. rather than the TRS.  I've
> noticed a strange behavior in that the squelch will
> frequently break, but there is no audio that
> follows.  This has been verified on multiple radios
> and in multiple locations, so it doesn't seem to be
> related to interference in any way.  I haven't
> noticed this behavior on 4A on the TRS, so it seems
> to be limited to the conventional alerting freq. 
> Anybody know what might be going on?
> 
> Randy
> _______________________________________________
> Scan-DC mailing list
> Scan-DC at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/scan-dc
> 


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