F250 Radio Interference

[houstonstroker]

I installed a Midland GMRS radio in my friends new F250. I got power from the upfitter switches. sitting in the driveway no problems. Noticed that as soon as the gear shifter was put in reverse or drive the radio started receiving static. No problems in neutral or park. We had to turn the squelch way up in order not to hear the static. I'm guessing maybe some sensor is on or near the same frequency. Have you heard of this? I'm wondering if I get power directly from the battery, will this cure this problem?

 

[tweiss3]

I installed a Midland GMRS radio in my friends new F250. I got power from the upfitter switches. sitting in the driveway no problems. Noticed that as soon as the gear shifter was put in reverse or drive the radio started receiving static. No problems in neutral or park. We had to turn the squelch way up in order not to hear the static. I'm guessing maybe some sensor is on or near the same frequency. Have you heard of this? I'm wondering if I get power directly from the battery, will this cure this problem?

What did you route the antenna cable around? If it's reverse only, you could have routed it near the circuits for backup sensors, backup cameras or just the reverse lamp lighting, all of which could cause interference. Also, if you ran it within 6"-12" of a body control module, it can cause issues as well.

 

[houstonstroker]

We used the rubber grommet in the firewall. Put the extra antenna cable under the console. It was reverse and drive. We even turned off the reverse sensor but it didn't make a difference. Neutral and park no problem.

 

[900mhz]

Disconnect the antenna cable at the radio and see if the issue still exists...

 

[mmckenna]

Put the extra antenna cable under the console.

Don't do that. Could be absorbing noise from all the wiring under the dash. Cut the coax to just the length you need to get between the antenna and the radio. If you cannot do that, then at least stretch it out away from the dash.

Try pulling your power directly off the battery. Or, try powering it off a stand alone battery and see if noise goes away. If it does, then noise is getting in via your power wiring.

Try disconnecting the antenna, or using an antenna in a different locations and see what helps.

What year truck, what engine, etc?
Where is the antenna located, and how, exactly, did you mount it?

 

[RFI-EMI-GUY]

We used the rubber grommet in the firewall. Put the extra antenna cable under the console. It was reverse and drive. We even turned off the reverse sensor but it didn't make a difference. Neutral and park no problem.

1) Where is the antenna mounted and what kind of antenna?

2) Try getting power temporarily from an unswitched point on the fuse box. Or the battery + lead.

3) Where is radio grounded? t should be directly to the frame/unibody steel.