APX4500 Weird Issue

[emtunderwood]

Hello. Our FD switched to a P25 conventional system. Our engine came from manufacturer with APX4500 radios. It has flashcode for astro operation. We have programmed the radio and all of the other radios in the fleet. However, every other radio is NX5700. Our repeater is GTR8000 and at the 911 centers tower there is a NX5700. The problem is this.. Th NX5700s in the trucks key up talk to the 911 center, portable to portable, portable to 911 center just fine on the P25 GTR8000 crystal clear no problems whatsoever. The APX4500 can talk to the truck NX5700s and portables which are 5200 kenwoods just fine and vice-versa. Everyone can hear the truck talking through the repeater, even other departments, but the 911 center nx5700 cannot hear the APX4500 nor the APX4500 hear the nx5700 at the 911 center. I have checked antenna, checked the code plugs and nacs they are correct. I have no idea... Any ideas?

 

[Mogley]

Wild guess, but check to see if the radios are using all using C4FM or CQPSK

 

[emtunderwood]

They are on C4FM.

I spoke with the local Kenwood dealer, he stated he thinks it might be something with the APX on ASTRO due to the Talkgroup having a default of 1 and the Kenwood does not assign a talkgroup number or defaults to 1. That still doesn't work either.

 

[xntexan]

Are you sure the radio is actually hitting the repeater and not in talk around?

 

[Mogley]

Are you sure the radio is actually hitting the repeater and not in talk around?

I've tried it in talk around as well it's still doing it.