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    For M/A Com/Harris/GE, etc: there are two software packages that program all current and past radios. One package is for conventional programming and the other for trunked programming. The trunked package is in upwards of $2,500. The conventional package is more reasonable though is still several hundred dollars. The benefit is you do not need multiple versions for each radio (unlike Motorola).

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APX 4000 Question

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Premium Subscriber
Jan 9, 2004
New Jersey
I have a brand new APX4000 currently scanning the NJICS system in NJ. Just fooling around to see how it sounds. NJICS is mostly P25 phase 2, with a handful of phase 1 talk groups. Right now I have it programmed conventionally, and I'm hearing only phase 1 traffic. It sounds perfect. Just to confirm you can only hear phase 2 if it's programmed as a trunked system?


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Well Known Member
Database Admin
Oct 4, 2007

Scanning the voice channels in conventional mode will only allow for decoding FDMA activity.

In order to decode TDMA activity on those channels, the trunked system must be programmed into the radio. The reason being that the control channel contains the information about the TDMA slots for each voice channel.

The APX must also have the QA00580 FLASHcode feature to enable TDMA operation.
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