[Elecraft] KPA500 - Advantage of min fan speed?

[Bob McGraw K4TAX]

Thermal lag exists and likely always will.   The hysteresis is reasonably adequate in the present configuration. 

I find no objection to the performance of the present method of cooling. 

Bob, K4TAX


Sent from my iPhone

> On Oct 2, 2019, at 9:46 AM, Don Wilhelm <donwilh at embarqmail.com> wrote:
> 
> Bob,
> 
> The problem with that is the fan must continue to run for some time after the return to RX so the residual heat from the TX cycle can be reduced.
> 
> 73,
> Don W3FPR
> 
>> On 10/2/2019 10:12 AM, Bob wrote:
>> Personally, I wish Elecraft offered a slightly different approach, rather
>> than a minimum fan speed setting, how about a RX minimum and TX minimum?
>> This would allow quiet operation on RX, but would anticipate a higher
>> demand for cooling on TX.
>> There is quite a bit of thermal mass and overshoot that happens in TX on
>> digital modes.  By the time the fan turns on, it tends to be running behind
>> the curve trying to catch up.  Starting the fan running as soon as the rig
>> goes into TX would help considerably and allow things to go back to quiet
>> in RX.
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