3 digit number 800 mhz search

[bravo14]

I did a 800 mhz search and it stop on a freq and 3 digit pop up. For example 317 will show up when they talk. I do not know what that is.

 

[bneilson]

Were you in 'search' or 'tune' when the numbers show in the screen?

 

[bravo14]

I'm in Search when the numbers show up on the right hand side of the screen. It will show P25 and the 317 at the same time.

 

[DonS]

It's the P25 NAC ("Network Access Code"). Can be used on Project25 digital frequencies like CTCSS and DCS are used on analog frequencies.

 

[bravo14]

I try to search for the P25NAC see the numbers like the pl/dpl tones. I do not see 317 on the list I see 31D on there.

 

[wlmr]

I try to search for the P25NAC see the numbers like the pl/dpl tones. I do not see 317 on the list I see 31D on there.

317 (decimal) = 13D (Hex). Could there have been a typo?

(Unless the scanner shows the NAC in Hex to start with, then I'm out of ideals.)

 

[mikey60]

317 (decimal) = 13D (Hex). Could there have been a typo?

(Unless the scanner shows the NAC in Hex to start with, then I'm out of ideals.)

The scanner does show the NAC in hex. On trunked systems, the site's NAC is usually a subset of the SystemID. In Michigan, on the MPSCS, the System ID is 796 (Hex). NAC values always start with 79, and vary from site to site on the third character (Local towers are 79D,79A, 79B, etc..)

The frequency found may be from a trunked system with a system ID starting with 13?

Mike