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 TXCO 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
----- Original Message -----
From: "Darrell Gordon W4CX" <w4cx@bellsouth.net>
To: <tentec@contesting.com>
Sent: Sunday, October 14, 2007 1:03 PM
Subject: [TenTec] Cooling an Omni VI?
Hey guys.. Does anyone have experience/suggestions on how to add cooling
to
an Omni VI? I need to pull air through the side vents and out the back,
but
I'd rather not make any irreversible mods to the case. Need something
quiet
but efficient. Reason is rig is mounted in a relatively tight cabinet
with
only 1/2 inch of clearance on the sides and top. (I know, not good
practice, but unavoidable in my shack). Thanks for any help DE Darrell
W4CX
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