Squadman35
Newbie
Running a VHF/800 APX 7500 in an Ambulance. 2 remote head setup, identical to all of our (and most other local agencies setup) other trucks setup.
On this one radio, it has a completely random transmitting issue. When it happens, it only transmits some low volume static. All data transmissions are still successful. No error codes on the radio. It never has a problem receiving transmissions, and never drops signal. In these situations, it is always on a P25 trunking 800mhz system. (The VHF side is rarely used, only kept for mutual aid rare use cases).
I’ve taken this radio (in the ambulance, and separate for testing) to our agency that maintains everything radios. No issues found while inside the truck, and we left it for a few weeks for testing with no issues found. I was able to recreate the issue one singular time for them while it was at the shop, after quite a while of trying to explain it.
We’ve replaced antennas, microphones, and tried all of the usual troubleshooting things, including a lot of suggestions found on here. The cause of this seems to be completely random. Trunking system coverage in our area is incredible, and it happens regardless of location. The radio itself is about 8 years old, properly tuned/aligned, and prior to this has had no known issues.
It currently lives in its 2nd ambulance since we got the radio. It had been installed and running in this ambulance for >6 months before it had the issue, so I’m running on the assumption the truck itself is the cause. No crazy voltage drops that we have seen, and nothing super funky that we are aware of with wiring or power in general.
Any thoughts?
Getting a direct audio recording from the console playback of the static when this happens shortly!
On this one radio, it has a completely random transmitting issue. When it happens, it only transmits some low volume static. All data transmissions are still successful. No error codes on the radio. It never has a problem receiving transmissions, and never drops signal. In these situations, it is always on a P25 trunking 800mhz system. (The VHF side is rarely used, only kept for mutual aid rare use cases).
I’ve taken this radio (in the ambulance, and separate for testing) to our agency that maintains everything radios. No issues found while inside the truck, and we left it for a few weeks for testing with no issues found. I was able to recreate the issue one singular time for them while it was at the shop, after quite a while of trying to explain it.
We’ve replaced antennas, microphones, and tried all of the usual troubleshooting things, including a lot of suggestions found on here. The cause of this seems to be completely random. Trunking system coverage in our area is incredible, and it happens regardless of location. The radio itself is about 8 years old, properly tuned/aligned, and prior to this has had no known issues.
It currently lives in its 2nd ambulance since we got the radio. It had been installed and running in this ambulance for >6 months before it had the issue, so I’m running on the assumption the truck itself is the cause. No crazy voltage drops that we have seen, and nothing super funky that we are aware of with wiring or power in general.
Any thoughts?
Getting a direct audio recording from the console playback of the static when this happens shortly!
