[FedCom] FBI Radio Systems Keyups?

[Tom ND5Y]

Ken wrote:
> I've noted for many months now that in my area 167.5875 (CTCSS 167.9), 
> keys up once every 40 seconds or so, with a dead carrier for about 1 to 
> 2 seconds.

It does that here in the DFW area too. I haven't timed it to see how 
often it happens but it appears to be random. In the DFW area they have 
multiple sites linked together. I can hear the tone remote clicks from 
the voter sites when it does that. I have also heard what sounds like 
ground loop hum and phone line static. It sounds to me like it is only 
noise getting into their system.

> Is there a reason now for these keyups?  (e.g. does it display radios 
> numbers in range and/or indicate to units that they are within range of 
> that specific site?).

I have never heard anything that sounded like data or ANI. I don't think 
it is anything fancy like that, just noise, but maybe it is different in 
your area.


Tom


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