[TenTec] Cooling an Omni VI?

Dr. Gerald N. Johnson geraldj at storm.weather.net
Sun Oct 14 17:10:07 EDT 2007


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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