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Nac?

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Grog

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http://wiki.radioreference.com/index.php/NAC

Network Access Code
For Project 25 digital radios, the NAC is similar to CTCSS or DCS in analog use. That is, radios can be programmed to only break squelch when receiving the correct NAC. NAC's are programmed as a 3 digit hexadecimal code that is broadcast along with the digital signal being transmitted.

Since the NAC is 3 digit hexadecimal number(12 bits), it gives 4096 possible NAC's for programming, which far exceeds its analog counterparts combined. It should be noted that 3 of the possible NAC's have special meaning:

0x293 ($293) - the default NAC
0xf7e ($F7E) - a receiver set for this NAC will unsquelch on any NAC received
0xf7f ($F7F) - a repeater receiver set for this NAC will allow all incoming signals and the repeater transmitter will retransmit the received NAC.
 

rescue161

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The 396 cannot decode NACs. There is no scanner at this time that can decode NACs. You will basically be monitoring in digital CSQ mode. No big deal unless you live in an area where multiple users use the same digital frequency and use different NACs to keep from hearing each other. You'll hear all agencies and it will get quite confusing/annoying.

I sure wish scanner manufacturers would put this feature into new models or better yet make a firmware update to the models that are already out there.
 
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