Tim,
I don't have an OMNI, but I have had a hum with my Paragon. It turned
out to be the monitor function. When the monitor pot on the rear panel
was turned up, and the (dynamic) mic was placed near the power supply,
the mic would inductively pick up hum from the power transformer. The
hum would then get amplified by the monitor circuit. Another thing to
check is the headphones. Good quality stereo type 'phones have alot of
sensitivity and band width, which sometimes translates into a hum
sensitivity. The solution to this is a simple resistive attenuator.
73, Bob WB2VUF
Tim Randa wrote:
>
> Hello to all...
> First I want to thank everyone who sent me email with comments about the
> Omni-VI. Now I need help of a different nature. I have just bought a very
> nice Omni-V full of filters that the only flaw I can find is a steady hum
> when useing the headphone or speaker jack. There is no hum from the rig
> speaker...only when useing headphones. It's present in all modes.
> Now...here has got to be the clue to the trouble...the hum goes away when a
> soft key (band, mode,filter) is pressed and held in. The hum returns when
> the key is released. The rig is well grounded, and the volume control does
> nothing to the hum except cover it up at a high volume level. If you have
> any sugestions..please email me. If I can get this one problem fixed I'll
> be one happy camper..I might even get a tentec tattoo...hi
>
> 73 to all
>
> de Tim K0FL
>
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