A question for the assembled windup...

[wb5mmb]

Looks like your message got stuck in the mailing list machine until 
today. But incase you have not fixed it yet.
Mike, swap the radios, including any ground connections that are not 
on the power connector.If the whine stays with the radio you have a 
bad filter cap. If it changes radios redo all the power and ground 
connections even if they look good.
  I owned a boat about 35 years . It had a 2m rig on it. It was a bit 
smaller than yours but the hole in the water still took a nice hunk 
of my pay check. Good luck.
      Sandy
      WB5MMB


At 08:21 AM 12/12/2010, Mike O'Dell wrote:
>Fact pattern:
>On my boat I have two identical Icom IC-M602 marine transceivers.
>The are fed by the same power source attached to a common +12 
>distribution point.
>The two power cables are short and the radios are side by side in 
>the helm overhead.
>Power ground buss is shared as well.
>
>The problem:
>One radio, on the PORT side, has *significant* alternator whine 
>(even with audo gain at zero and squelched).
>The other radio, on the STB side, is dead quiet.
>Switching antenna feeds has NO effect?
>
>Why does one radio have whine and the other doesn't? I have wracked 
>my brain trying to think of an explanation for the difference.
>
>Suggestions?
>
>      -mo
>
>Ps I'm on crackberry because we're in the Intracoastal Waterway in 
>souther South Carolina moving the boat to warmer weather - we hope!
>
>Sent from a Blackberry so please excuse the typing. I'm all thmubs.
>
>
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