[Elecraft] Cooling fans

[Ron D'Eau Claire]

Also sure you don't have anything blocking the fins at the *front* of the
K2. The air blown in the back by the little fan comes out between the fins
where they reach the plate at the front of the KPA100. I've found that a lot
of people don't realize the gaps are there to let the air escape. 

For what it's worth, I helped do the thermal testing of John's PLL
temperature compensation mod (that's now built into current K2's). To do
that I "hammered" my K2/100 with a great many high-duty-cycle transmit
periods into a large dummy load while monitoring the internal temperature.
Many times the internal air temperature got up to 50C or 60C and the KPA100
heat sink was too hot to leave my hand on it very long. Absolutely no
deleterious effects were noted then or later. (Still have the same finals
too <G>). 

That rig is designed with a large margin of safety. 

Ron AC7AC


-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Don Wilhelm
Sent: Saturday, October 29, 2005 12:19 PM
To: R. Kevin Stover; Elecraft mailing list
Subject: RE: [Elecraft] Cooling fans


Kevin,

The easiest solution is to simply lay the fan (horizontally) across the heat
sink fins.  Suck the hot air away from the heat sink, that way it works in
tandem with the internal fan rather than fighting the internal fan
airstream.

73,
Don W3FPR

> -----Original Message-----
>
> I'm getting my K2/100 ready for sweeps and have decided to add some 
> aux cooling. I have a couple of 3" computer case fans and was 
> wondering from those who've done the same about placement and whether 
> blow the air onto the heatsink or suck it through.
>
> Thanks for your input.
>
> R. Kevin Stover
> AC0H
> K2/100 # 4684.
>
>

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