[Elecraft] K3 Cooling

[Bob McGraw - K4TAX]

OH heavens, the idea to transmitting into a "dead band" for an hour would 
most assuredly be considered a violation of FCC regulations.  Yes, a dummy 
load should always be used for any type of testing.

As to fans, they either BLOW or SUCK, your choice.  A fan with blades 
performs better sucking or evacuating a cavity while a centrifugal type 
blower or a fan with vanes will be better suited for pressure applications. 
In any event, all fans are noisy either due to tip speed of the blades or 
bearing noise of the motor.  Convection or conduction cooling is much 
preferred.

73
Bob, K4TAX


----- Original Message ----- 
From: "K6LE" <k6le at mac.com>
To: "Elecraft Elecraft" <elecraft at mailman.qth.net>
Sent: Monday, April 05, 2010 11:40 PM
Subject: Re: [Elecraft] K3 Cooling


>
> On 4/5/2010, at 9:11 , Guy Olinger K2AV wrote:
>> >> Snip
>> As to how good the cooling is, just to see what happened, I let the K3
>> transmit at 100 watts for a half hour into a dead band.
>
>>>
>
> I wish you had said "In to a dummy load"..
>
> As an aside, it's amazing how many engineering papers a simple question 
> about which way the fans should be blowing in the OP's K3 can generate!
>
> Rick
> K6LE
>
>
>
>
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