[Elecraft] LDMOS for QRO [OT]

David Cutter d.cutter at ntlworld.com
Sun Dec 14 18:32:48 EST 2014


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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