[FedCom] FBI Radio Systems Keyups?

[Bill]

The other thing could be a Mobile or Portable out of range of your Repeater
barely making contact, causing the kerchunk'n.  Many of the networks [FBI]
use a common input frequency while using multiple outputs.   Are there other
repeaters active at the same time, while this is occuring?  Scan the entire 
162-174 Mhz
spectrum and see what you might be missing.

 If not, then yup, intermod, bad phone lines etc , would be the source.


----- Original Message ----- 
From: "Tom ND5Y" <nd5y at yahoo.com>
To: "Discussion of Federal Government Communications" 
<fedcom at mailman.qth.net>
Sent: Saturday, March 22, 2008 7:48 PM
Subject: Re: [FedCom] FBI Radio Systems Keyups?


> Yes. All I could see was the PL tone. In my area it appears that this is
>  just some type of interference or noise that occasionally falses the
> PL decoder, or something in whatever they use to link everything together.
>
> Tom
>
> Tom Greenwood wrote:
>> Has anybody made any attempts at looking at the transmissions using an 
>> audio
>> spectrum analyzer such as the program Spectrogram to see if there are any
>> subaudible data transmissions?  I have used this program in the past 
>> looking
>> at data transmissions with very interesting results.  As I recall, the 
>> old
>> 414/419 links were rather revealing once looked at this way.
>>
>> 73's
>> Tom, N1JQB
>> Metro West Boston
>
>
> 
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