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Kenwood TK-5170 humming

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Just installed a Kenwood TK-5170 VHF 110 watt remote mount radio in my 2007 Silverado Classic. When I transmit there is a humming in the back ground even when the engine isn't running. I'm wondering if maybe it's a bad ground but does anyone have any other ideas?
 

jim202

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New Orleans region
Just installed a Kenwood TK-5170 VHF 110 watt remote mount radio in my 2007 Silverado Classic. When I transmit there is a humming in the back ground even when the engine isn't running. I'm wondering if maybe it's a bad ground but does anyone have any other ideas?

You need to clarify just where the hum is coming from. Is it in your vehicle? Maybe your hearing RF getting into the AM / FM radio sound system in the vehicle.

If it is a comment from someone listening to your radio transmitter, then I would have to ask if that person is hearing the sub audible tone (CTCSS) coming from your transmitter. depending on the radio being used to listen to your transmission, that radio may not have a filter in the receiver to reduce or eliminate the CTCSS tone your transmitting. Some of the off shore radios tend to let the CTCSS tones come through with little or no attenuation.
 
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It happens when I'm transmitting you can hear it on the other end. I've tried it on 3 radios.

Even when the truck is not running. The engines off, the only thing on in the truck is the radio
 
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If I just keep up the microphone and listen on the other end through another portable or mobile you hear a humming in the background and as I said , with no other electronics running, the motor isn't running , it still does it .
 
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