Posted: 4/4/2011 6:01:11 AM EDT
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Okay I am not good when it comes to interference and trying to eliminate it.
I drive a 2009 Ford Focus 4 door Sedan, running a Yaesu FT-8800 mobile rig. The mobile rig is mounted in the trunk under the rear deck and remote head and speaker is in passenger area. Now when I transmit on the Yaesu my car stereo rear speakers get a "hum" in them that I know is from the Yaesu. Where would I need to put a filter? Would I need to put something like this in line with my Yaesu? Noise Filter Or would I need to put something on the wires for the speaker closest to the Yaesu in the trunk? Thanks for any and all help. In the picture below above where the remote wire comes out of the radio behind that area of metal is where my car stereo speakers are. Sorry for the tiny picture. 
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| did you strip your ground point down to bare metal? where did you run the antenna wire? if its close to a wiring harness it could be leaking RF and its jumping into that harness. simple fix would be to move the antenna wire. how about the power wire, how is that run from the batt to the radio? |
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Sorry should had that in here to about wiring and antenna.
Power and ground wires are directly to the battery from the trunk using Powerpoles and fused by the battery. Antenna wire comes in on the otherside of trunk (left side of picture) away from power wires which are run down the right side of the car in this picture. |
| do you have the means to power the radio at the radio? meaning a spare battery and power plug? try that. if you still have the hum its the antenna. if its gone then its time to rerun the power from the battery. is it possible to try a ground there in the trunk/hatch with the power still running to the battery since you have PPs on the leads? |
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Quoted:
is it possible that the rf is coming back in through the stereo antenna? That's what I was thinking, or getting into an amplifier that's always powered on. OP, you might try seeing if it goes away or gets better by turning the transmit power down on the ham radio. Or try it with the ignition off. |
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Quoted: Quoted: is it possible that the rf is coming back in through the stereo antenna? That's what I was thinking, or getting into an amplifier that's always powered on. OP, you might try seeing if it goes away or gets better by turning the transmit power down on the ham radio. Or try it with the ignition off. |