h4cking, ham radio, fire fighting and m0re

NX-5300 Programming

It seems like Kenwood uses totally different terminology to refer to configuration items in their radio programming software. This is my memo for various options that I discovered why program&try :).

I use the radio in NXDN, P25 and DMR modes (and FM as well). Apparently the radio can only use two of the Digital Voice modes at a time. That means you can use P25+DMR or DMR+NXDN or NXDN+P25 in a codeplug but not all three. I you need to switch you have to write another codeplug. Pure FM is always available independantly of the DV modes.


This are the settings specific for P25. Some of those may also have an impact on other DV modes.

Talkgroup Settings

In default settings all Calls on a channel use TG1 as destination. In order to be able to switch between different talkgroups you have to have a list of TGs to choose from. This list has to be referenced in the channel settings of each P25 channel under “Talkgroup ID”. Select the default TG from the list with the number in “List Number”. Here I chose TG1 local as default. In addition to this the option “Talkgroup Strapped” has to be deactivated. Otherwise you will have the “Group” item in the menu but cannot select a talkgroup. Not sure what this is good for.

If this is programmed you can choose the talkgroup for the channel from the menu/front panel. You can scroll through the list of configured talkgroups and select the one you wish to use for the next transmissions. Obviously there is no reset timer or the like that reverts back to the channel default. Even switching the channel back and foorth keeps the selected talkgroup. To reset to the channel default you can choose “Talkgroup Rst” from the menu.

Audio Settings

I have just been informed that my transmissions were terminated with some strange beep tone that was transmitted from the radio. A bit of exerimenting showed the source: “PTT Release Tone” under “Optional Features 2”:


In the area here we have some P25 repeaters connected to each other using their secondary receivers. That lead to the situation that an OM coming from another repeater in the net was not heard on my radio. After some investigation I discovered that this was due to another NAC being used for transmissions from people not on the same repeater. To make the radio decode this you can use “F7E” as NAC on the RX side. This makes the radio decode any transmission regardless of the NAC.