[Scan-DC] Interesting graphic of trunking pattern

[Andrew Clegg]

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