[Elecraft] LDMOS for QRO [OT]

[Richard Solomon]

If one wanted to use one of these to cool an LDMOS VHF KW, where would
one find the design info to calculate which cold plate would provide 
sufficient
cooling ?

I envision a stack something like this:

LDMOS PC Board
Copper Heatsink (thickness need be determined)
Cold Plate
Aluminum Heat Sink (is this really necessary ?).

73 es HH, Dick, W1KSZ


On 12/14/2014 4:32 PM, David Cutter wrote:
> I'm a little surprised that folks in this group haven't suggested 
> liquid cooling for this modest application. Semiconductor cold plates 
> have been around for a long time, are economical to use and in my view 
> a much better solution than forced air cooling.  They are compact, 
> quiet, require far less cabinet space, keep junctions cooler and more 
> stable than air could ever and enable higher reliability.
>
> Look at Aavid for instance, whose devices I used on many occasions:
> http://www.aavid.com/sites/default/files/products/liquid/pdf/liquid-cold-plate-datasheet-hicontact.pdf 
>
>
> If you play your cards right, you can cool the amplifier and the power 
> supply on a short 4-pass plate.  Put the heat somewhere convenient, 
> not in your shack.
>
> 73
>
> David
> G3UNA
>
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