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
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
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
"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
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 wrote:
>
> Bob,
>
> The
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
Personally I think it works great as designed. Yes there could be changes but
I doubt we'd see much, if any difference in performance.
Hams today in general seem to delight in complaining. I find many should look
in a mirror to identify the source of an issue. I'm one that believes in
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
For SSB voice operation and CW operation I leave the fan speed at
NORMAL. For digital modes, which all have a higher duty cycle, I
usually set the fan speed to 1. I do find the fan speed increments up
and down as needed and as driven by the temperature. When running 400
to 500 watts most
craft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Andy Durbin
Sent: Tuesday, October 01, 2019 11:52 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA500 - Advantage of min fan speed?
Thanks to everyone who contributed their experience of operating with min
fan speed s
Thanks to everyone who contributed their experience of operating with min fan
speed set above 0.
I have some ideas for a test series and I'll share anything I learn from it.
Here is a teaser for those interested in KPA500 thermal management. Did you
know that, for a KPA500 that has not
All you guys had to do was ask. When going down, the hysteresis is 3 degrees.
That means that each threshold is shifted down 3 degrees.
The hysteresis is necessary to keep the fan speed from bouncing up and down
when the temperature is at one of the switch points.
73!
Jack, W6FB
> On Sep 30,
When running RTTY with the KPA500 I no longer have, I noticed that, with
a minimum fan speed greater than zero, the temp tended to fall lower
during RX periods than when the min speed was zero. During the
subsequent TX period, having started from a lower temp, it would not
rise as high,
Andy
I would call Elecraft and ask them directly. Unless they respond directly here
in the forum everyone is just guessing
Mike
> On Sep 30, 2019, at 1:13 PM, Andy Durbin wrote:
>
> "I got the thresholds from Elecraft directly.
> I never worried too much about them since the Elecraft guys
10:28 AM
To: Andy Durbin ; elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA500 - Advantage of min fan speed?
Andy,
Physical fact related to any heat dissipating object -- if you apply an air
stream across the object, it will not come up to a given temperature as quickly
as having no air stre
Andy,
Physical fact related to any heat dissipating object -- if you apply an
air stream across the object, it will not come up to a given temperature
as quickly as having no air stream across it.
Specifically for the amp, if you run the fan speed minimum at 1, it will
heat to the 55 degC
"I got the thresholds from Elecraft directly.
I never worried too much about them since the Elecraft guys are pretty smart
people and likely have done a lot more research on this than most of us."
That's possible but they only gave you half the information. The thresholds
you quoted are for
I got the thresholds from Elecraft directly.
I never worried too much about them since the Elecraft guys are pretty
smart people and likely have done a lot more research on this than most of
us.
Mike va3mw
On Mon, Sep 30, 2019 at 9:28 AM Mike Maloney wrote:
> Thanks Mike for the KPA-500 fan
Thanks Mike for the KPA-500 fan level settings. That answers the question I
was going to ask. Could find no fan level info in the owners manual or from
previous posts.I don't suppose any record kept of SPL readings at the
different levels? Anyone done that?
73, Mike AC5P
On
During CQWW RTTY this weekend I ran mine at level 3. Normally I keep it at
the NOR setting. When I was in the S mode the KPA500 stayed at this
level. When I was in Run mode the KPA500 would occasionally go to the
highest speed when working a pile up. My antennas are pretty much tuned and
I kept
Here are the thresholds
level 1: 50 degrees
level 2: 55 degrees
level 3: 60 degrees
level 4: 65 degrees
level 5: 70 degrees
level 6: 80 degrees
if the temperature gets above 90 degrees we throw a fault and drop into standby
(with fault showing).
Mike va3mw
> On Sep 29, 2019, at 10:38 PM,
On 9/29/2019 7:38 PM, Andy Durbin wrote:
Please share you experience of using min fan speed greater than zero, and any
data if you have it.
Lots of experience, but I've never bothered to take data. I used my
KPA500 (replaced by KPA1500) a lot for WSJT modes on 6M. The KPA500 fan
gets pretty
The KPA500 offers a minimum fan speed setting which is settable by menu or
serial command. Some posters have advocated setting a minimum fan speed higher
than zero, presumably thinking it offers some advantage in thermal management.
Does anyone have any hard data that shows that the KPA500
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