Has anyone had any luck with a decoder for decoding NAC codes yet ?
Maybe uni-trunk will do it ?
Maybe uni-trunk will do it ?
nac decoding
- Thread starter carbineone
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DaveNF2G
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There is no legitimate use for such a capability. Anyone who is authorized to transmit on a trunked system would have the NAC programmed into their radio by the shop that supports the system. Nobody else needs the information.
N
N_Jay
Guest
DaveNF2G said:
Or he could be refering to NACs in P25 that are used like Coded Squelch.
But that would be mostly from non-trunked operation.
Uh hum ok then !
Let's see I have different users on one channel using different NAC's
and I want to be able to just listen to the one group. Seems like a legitmate reason to me. Also NAC's are used on non-trunked radio systems and that is what I was interested in.
Let's see I have different users on one channel using different NAC's
and I want to be able to just listen to the one group. Seems like a legitmate reason to me. Also NAC's are used on non-trunked radio systems and that is what I was interested in.
N-Jay thanks that is exactly what I was talking about. You will see many places switching to Apco-25 digital non trunked systems soon and NAC's
will be the new ctcss. Right now there is nothing out there to decode them
except a $25,000 motorola service monitor.
will be the new ctcss. Right now there is nothing out there to decode them
except a $25,000 motorola service monitor.
Excellent news thanks !
DaveNF2G said:
There's no legit use for my car going over 100 either.
:roll:
There's always gotta be one in the group.
mancow
D
DaveNF2G
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My intention was to defend (preemptively) the programming team in case they had not included that capability. I never expected them to do so, but I was wrong about that, I see.
Also, I stand corrected on legitimate non-trunking uses of NAC for system "outsiders." Learning something new every day.
When that stops, it's time to retire.
Also, I stand corrected on legitimate non-trunking uses of NAC for system "outsiders." Learning something new every day.
When that stops, it's time to retire.
I'm wrong about something about a hundred times a day, join the club.
mancow
mancow
NAC codes
Q. What is a NAC code and Talkgroup?
NAC stands for Network Access Code. NAC codes serve the same function in digital communications as CTCSS tones serve in analog communications. Talkgroups are used to divide users into separate groups for communications purposes. A digital channel must have both a NAC code and a Talkgroup designated. There are 32 standard CTCSS tones with only about a dozen of these commonly used. There are 4,095 different NAC codes and 65, 535 different Talkgroups available for use within the P25 standard.
Q. What is a NAC code and Talkgroup?
NAC stands for Network Access Code. NAC codes serve the same function in digital communications as CTCSS tones serve in analog communications. Talkgroups are used to divide users into separate groups for communications purposes. A digital channel must have both a NAC code and a Talkgroup designated. There are 32 standard CTCSS tones with only about a dozen of these commonly used. There are 4,095 different NAC codes and 65, 535 different Talkgroups available for use within the P25 standard.
DaveNF2G said:
Thanks Dave. The NAC is the first 12 bits of every P25 frame of data. From a data decoding point of view, it's hard to ignore. It has value for folks monitoring a system - by giving them a means to filter out content they don't want to hear. It has similar value as a diagnostic tool for folks operating a system. The software to which you refer to is meant to benefit both groups.
-rick
rfmobile said:
Is that kind of similar to the 'status bit' on a 3600 system?
So this could be used to, for example, say "Every time you detect an encrypted transmission, just keep on scanning"?
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