This is a little off topic but I could use some help.
I am working on a fire truck that is getting interferrence on the VHF
(156.075mhz) from the trucks wiring.
If I put an HT near I get the interferrence on the HT. When I disconnect the
battery it goes away.
We removed one fuse at a time and it went away when we pulled the fuse to the
trucks computer ECM module.
We tried an ECM module from another truck w/o the interference problem and we
still had it in the bad truck.
Next I tried sniffing around with a spectrum analyzer and found the highest
noise near a large bundle of vehicle wiring. We are talking a tightly bunched
2-3 inch bundle.
Tried adjusting the squelch to open at .5uV but that did not help.
Need some idea on how to proceed.
Thanks
Tim
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