Hi RICH, as you were just saying about Codes....
RG> -> SM>  Cleveland just went to a Digital Trunked 800mhz Radio dispatch
RG> -> SM> system
RG> -> SM>  for all 6 districts to prevent unwanted persons from gaining
RG> -> SM>  information they shouldn't have (mainly TV stations), S.W.A.T. 
nd
RG> -> SM>  special operations units also have their own frequencies.
RG> -> SM>
RG> -> SM>  A trunked system essentially means that you have "example" 5 
RG> -> different SM>  frequencies which are controlled via a central 
RG> -> computer that rotates SM>  them when they are not in use, thereby 
RG> -> deterring listening by persons SM>  whom may have equipment that 
RG> -> could pick them up, and some departments SM>  have a birdie 
RG> -> (electronic tone) which rotates on the channels not in SM>  use, 
RG> -> making it impossible to scan the frequencies with radio traffic.
RG> 
RG> -> No, it isn't.  I can listen to my local county sheriff's office with
RG> -> no birdie tones even thought they are on an Ericsson system.  There 
re
RG> -> also a couple of scanner commercially available that track the 
otorola
RG> -> trunking system.  Uniden has one as does radio shack.
RG> 
RG> The "birdie tones" or ident tones that some radios put out at
RG> transmit is a system developed by Motorola to identify the mobile. 
RG> It keys the number assigned to the particular vehicle to a display
RG> in front of the dispatcher.  We had a local PD that had it, and I
RG> set the scan option off on my State radio for that frequency because
RG> it drove me up the wall.
Yep.  I don't hear it on my scanner and that is important to me.
RG> It's since be replaced by GPS systems that some of the more
RG> upscale departments are using. 
Your VDT terminals are even better.  They are not scannable, AFIK.
RD 
sandman@azstarnet.com - A newspaper ISP - Arizona Daily Star
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