On Sun, 2007-10-14 at 15:59 -0500, Bob McGraw - K4TAX wrote:
> I've found that issues which require cooling are really heat from the PA
> heatsink just generally heating the radio on the inside. My solution was to
> put a small fan blowing on the heatsink at the rear. I used a 3" 12V DC
> fan plugged into the 12V AUX jack on the rear. The fan was mounted using a
> couple of "L" brackets using the mounting holes on the fan and the free end
> of the "L" bracket was tucked between the heat sink and top cover. There's
> enough space with a little effort to make it work and no holes were required
> to be drilled anywhere.
>
> This cooled the heatsink down adequately, when using PSK or RTTY modes, such
> that the internal temp of the radio was kept down. This then eliminated the
> typical BFO drift often associated with the Omni VI and VI Plus series. The
> later Plus series used a TCXO for the master osc but the BFO rocks were not
> temp compensated and were known to move a bit as the temperature was
> elevated inside the cabinet.
>
> Hope this helps.
>
> 73
> Bob, K4TAX
>
And nearly every PC supply has one of those fans inside, though new ones
are available many places like Jameco...
73, Jerry, K0CQ
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