[Elecraft] KPA100 mechanical assembly question

wd4lst at windstream.net wd4lst at windstream.net
Thu Mar 8 22:37:02 EST 2007


Goo evening all,
I am on page 37 of my KPA100 build, getting ready to solder the finals on the board.
After fitting the circuit board to the heat sink, I noticed that the bodies of transistors 
Q3 and Q4 prevent the circuit board from resting on pedestal standoff shoulder beside Q3.
The transistors are flush with the bottom of the circuit board, but Q3 and Q4 are 
~.095 inch thick, and the shoulder is only .075 inch higher than the pedestal. 
I realize that the transistors need to be able to be snugged to the heat sink
for thermal transfer, but that standoff should make contact with the ground plane of the
board. The manual mentions several times not to use washers between the sink and the board,
but shouldn't there be something there? I looked forward in the manual, but did not find
find anything that addressed this. Is this a non issue?
Thanks,
Pete
wd4lst
 


Pete Axson
WD4LST
17901 NE 18th Ave
Citra, FL 32113



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