KPA500 - Advantage of min fan speed?

[ANDY DURBIN]

"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."

I have implemented that feature as an option in my controller.   Current implementation is  - on TX set min fan speed = 1, 30 sec after TX stops return min fan speed to normal.   It will be easy to change min speed and dwell time if test data suggests that would be worthwhile.

It's not yet obvious that this option offers any advantage but I only used it in a casual S&P operation during CW-WW-RTTY.

Andy, k3wyc

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[ANDY DURBIN]

Some experimental data documented here - https://tinyurl.com/y3ghrdpw

Based on this data set I conclude there is no advantage to running minimum fan speed greater than zero.   That's going to surprise some people and comments on test method and test data are welcome.

73,
Andy, k3wyc


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[Macy monkeys]

During a CW ragchew with a 20 wpm 400 w transmission duration of approximately 5 minutes I was being bothered by amp fan kicking into high gear towards the tailend. So I set the fan to level two; my amp is down under my desk so fan noise is minimal. Now I can enjoy a CW ragchew without the amp fan kicking into jet engine mode. 'Pre-cooling', as it were, works for me.

John K7FD

> On Oct 3, 2019, at 10:27 AM, Andy Durbin <[hidden email]> wrote:
>
> Some experimental data documented here - https://tinyurl.com/y3ghrdpw
>
> Based on this data set I conclude there is no advantage to running minimum fan speed greater than zero.   That's going to surprise some people and comments on test method and test data are welcome.
>
> 73,
> Andy, k3wyc
>
>
> ______________________________________________________________
> Elecraft mailing list
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[K8TE]

Excellent work Andy!  The data make a point that anecdotes fail to
accomplish.  My good friend Alan, K0BG, describes this culture as "It
WORKs."  WithOUt Real Knowledge.  There is too much of this going around and
not enough data.

I will give a presentation on using WSPRLite at Pacificon later this month.
Those little transmitters provide data on antenna performance whereas the
rest of the amateur radio world is satisfied with "This beats the dipole I
had up last year."  Collecting data allows us to make informed decisions and
not rely on what the unicorns bring to the table.

73, Bill, K8TE



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