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Powering Off

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rustyjw

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I have a Kenwood 7180 and most times when I key up the radio it powers off then on. Any thoughts on what could be causing it?

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MSS-Dave

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Lack of enough current to transmit. You either need a larger power supply or if mounted in a vehicle, you need to check your wiring for problems.

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rustyjw

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It's vehicle mounted. I guess I should check the harness going in to the radio then go from there?

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rustyjw

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Ok. I'll check that

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KK4JUG

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It may be simply a diminishing battery. This frequently happens with ham radios when the engine is not running and you're trying to transmit on power that draws more than the battery will allow. Lowering the transmit power on the radio can solve the problem in that case.

If the engine is running and your problem occurs, you've got battery or connection problems, probably the former, At night, if your headlights dim when you transmit, you've definitely got battery problems.
 

rustyjw

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Thank you for the info. It happens with the car running
I'll have to lay attention to the headlights.

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mmckenna

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Thank you for the info. It happens with the car running
I'll have to lay attention to the headlights.

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If it is happening with your engine running and the SWR is acceptable, then it's very likely a high resistance connection somewhere in your power feed.

Power for a mobile radio should be fed off the battery, not tying in anywhere else.
All your connections need to be tight and corrosion free. Could be you have a bad crimp connector somewhere. It doesn't hurt to put a touch of solder on those. Also, you have to pay close attention to the crimping. Some of the cheap hardware/auto part store "smash and pray" terminal crimpers do a poor job.
Check your fuse holder, too. Those can start to come apart.
All connections should be clean and shiny. If there is any corrosion, consider redoing the install, as if it's corroded in one place, it may be in others.

Grounding is important, too. Do not rely on just the negative power lead for your radio ground. I usually install all my radios with a dedicated ground connection direct from the radio chassis directly to body ground.
 

JMR3865

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If a radio has been added to the back or say an additional head (memory sucks), check that wiring and the possibility of anything pulled. I agree, If it turns off during transmit, It has to be a power/ground issue. If nothing has been touched since install, I'd go with power supply or maybe antenna (but I have never heard of an antenna issue turning off a radio, good feature though)
 
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