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Buzzing on APX6000XE speaker mic output

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yorkphotog

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I've got an APX6000XE w/ PMMN4062A speaker mic that I'm trying to stream audio from. When I connect a 3.5mm cable to the plug on the speaker mic, the audio is loud and clear but there is a buzz whenever someone is NOT talking. This only happens when the radio is docked in a charger - if it's running on battery the audio is perfect at all times.

It's been suggested this problem could be because the charger DC output isn't filtered.

Any thoughts? Thanks!
 

SCPD

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I last thought it wasn't recommended by /\/\ to have a portable on while it is charging in the cradle.
 

slicerwizard

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When I connect a 3.5mm cable to the plug on the speaker mic, the audio is loud and clear but there is a buzz whenever someone is NOT talking. This only happens when the radio is docked in a charger - if it's running on battery the audio is perfect at all times.

It's been suggested this problem could be because the charger DC output isn't filtered.

Any thoughts?
Noisy DC is likely the problem. Some LC filtering on the charging leg should help.

http://upload.wikimedia.org/wikipedia/commons/8/8e/Lowpass_Pi_Filter.svg
 

vans113

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with the motorola impress chargers you can have it on and charging and should be fine, sounds like some filtering is needed.
 

cmdrwill

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What is the 3.5 mm plug feeding to?

If you feed a recorder or audio PA say for the station, you will need an isolation transformer in the audio line. The speaker and earphone circuits are not referenced to the radio ground.
 
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