Check for a leaky filter capacitor. Check for loose transformer assembly
screws, which can also be the mounting screws. Check for a steel case
close to the core, maybe touching. Might take some stuff foam insulation
to slow the magnetic vibration of the case.
73, Jerry, K0CQ
On 2/17/2011 11:06 PM, Jim Anderson wrote:
> I just picked up a 255 power supply for my Omni D and it has a pronounced
> hum. This is not coming from the speaker, but from the supply itself. The
> supply that came with the radio (non speaker type) does not do this. Does
> anybody know what to check?
>
> Thanks,
> Jim K6JEA
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