Kenwood NX800 Back to Back

[jasej]

Hello friends,

I have the idea of creating a back-to-back system with two Kenwood NX800s in NXDN format. I need information you can provide to carry out this project, based on your experience with this type of system.

I don't need an ID, just that they can transmit digital audio through the NX800 radios, thus linking an installed NXR810 repeater.

Only by seeking precise solutions can we achieve excellence, and excellence must prevail in our daily work.

Thank you for your attention.

 

[hill]

Your tread title says NX300

 

[DeoVindice]

Audio quality will be degraded due to double vocoding. In my experience with those sorts of configurations, you'll need to disable AGC and any other audio processing as it can cause strange behavior.

You'll also need to find COR on the rear DB25 of each radio to trigger PTT on the other radio, and cross over the audio in/out lines in the same way. Transmit filtering is another question; an in-band configuration like that will experience desense.

There are better ways to do this. Look into the KTI-3 networking module and handle the linking over IP if at all possible.

 

[otobmark]

I missed what the purpose is? Are you trying to extend the range of an installed repeater or just bridge to digital SU’s.

 

[kd4efm]

Sounds like you're trying to create a BDA and this would not be very favorable. Ham radio wise you can play with it, part 90, that would be a negative as you need a class A BDA to do such a thing and a license update to your fcc license.

 

[jasej]

Your tread title says NX300

Yes my friend

It should say NX800

Sorry,

 

[jasej]

Audio quality will be degraded due to double vocoding. In my experience with those sorts of configurations, you'll need to disable AGC and any other audio processing as it can cause strange behavior.

You'll also need to find COR on the rear DB25 of each radio to trigger PTT on the other radio, and cross over the audio in/out lines in the same way. Transmit filtering is another question; an in-band configuration like that will experience desense.

There are better ways to do this. Look into the KTI-3 networking module and handle the linking over IP if at all possible.

Yes, my friend, I agree with your comments!
This is something we should continue experimenting with in some way, without using the vast resources that now exist to extend the range of a radio system.

I have done the same, back to back system using two NXR810 devices, and it works perfectly, all this in an amateur radio air frequency environment.

Thank you !

 

[jasej]

Sounds like you're trying to create a BDA and this would not be very favorable. Ham radio wise you can play with it, part 90, that would be a negative as you need a class A BDA to do such a thing and a license update to your fcc license.

Yes, it's basically just experimenting, in the frequency range of amateur radio.

Thank You

 

[jasej]

Thank you for all your answers