[Scan-DC] Interesting graphic of trunking pattern

[Andrew Clegg]

Hi Travis,

I'm afraid I don't know. I'm not an aficionado of Federal trunk systems. If 
it helps to identify the system, two of the frequencies are 407.7125 and 
407.8875 MHz. Those are two I tuned in directly on my R8500 receiver.

Andy

----- Original Message ----- 
From: "Travis" <freqhopping at earthlink.net>
To: <Scan-DC at mailman.qth.net>
Sent: Wednesday, February 11, 2009 9:27 PM
Subject: Re: [Scan-DC] Interesting graphic of trunking pattern


> The A73B system right?
>
> Travis
>
>
>
> ----- Original Message ----- 
> From: "Andrew Clegg" <w4jecom at w4je.com>
> To: "Scan DC" <scan-dc at mailman.qth.net>
> Sent: Wednesday, February 11, 2009 9:26 PM
> Subject: [Scan-DC] Interesting graphic of trunking pattern
>
>
>> While fooling around with my spectrum analyzer tonight, I took at look at
>> the Federal trunking band at 406 - 420 MHz. I noticed that one of the
>> prominant trunking systems uses a very basic pattern to assign radio
>> channels to active talk groups -- it just runs down the list of 
>> authorized
>> channels, then when it gets to the bottom, it starts back at the top
>> again.
>> I'm not sure how many trunk systems do it this way, but such a clear
>> pattern
>> isn't evident in other trunking bands, like 800 MHz. Anyway, I found it
>> interesting. I posted a waterfall plot at
>> http://www.w4je.com/specweb/trunk.php.
>>
>> Cheers,
>> Andy
>>
>>
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