>The inefficiency of heated air convection?
>
>My recommendation for any and all heatsinks is to have a fan oriented to
>keep air flowing across the heatsinks at all times. An acquaintance of mine
>lost his Omni VI+ finals while operating Field Day. He was operating
>outside, under a covered pavilion, in 90 degree temps, and no breeze.
>
>My Omni VI's have fans for each.
>
>Besides, the nice air flow from under and around the radios keeps the
>operator fresh, too.
>
>Get a 12v fan and plug it in to your Pegasus or PS aux V+ jack. Same goes
>for you VI/V/Paragon/Corsair, etc, owners, too!
>
Hmm....
You do not have a fan if you have a good designed heatsink.
But the heatsink in OMNI VI+ is not adeqaute. It is too litlle and
its fins (ribs) are mounted horisontaly. It means you loose again lots of
cooling efficency. (cooling will be degradate but a factor of 60%)
What I did was to change the whole heat sink with a propper one.
I did calculate the theoretical dissipated power and did choose the ambient
temp
to be 30 deg Celcius. The fins are vertical which make the air cool the heat
sink in a natural and proper way.
Thanks to that design I can operate my OMNI VI+ for hours (CW) in 20 deg C
ambient and the heatsink is mearly warm (35-40deg).
No need for fan !!!! (even if I have one in my drower for just in case...)
The jobb took only two days of porting and 25$ for hardware....
I hate fan noise...
Piotr LA9HFA
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Piotr Tomczak Ham call: la9hfa
Nera ASA E-mail: pito@satcom.nera.no
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