On 4/25/2022 4:15 AM, Andy Durbin wrote:
My test data showed no significant advantage in temperature control over just
letting KPA 500 decide when to run the fan.
Neighbor K6XX, a serious contester and the Elecraft engineer responsible
for putting both of their amps into production, advised
"Is there data showing more dissipated heat with lower output in solid state
amplifiers? "
I have test data for my KPA500 and it's very obvious that this amplifier has
higher PA heat dissipation at half power than at full power. Not just less
efficient as a percentage of power output but the
Sorry - too early in the morning - "KPA500" not "KPA 500".
Andy, k3wyc
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This
"Now, my question for everyone reading - when is it that you feel the need to
set the fan speed above 0?"
I coded my station controller to provide an option to start KPA 500 fan at
start of TX and have it run for a fixed time after TX stops. My test data
showed no significant advantage in
Bob, K4TAX
On 4/24/2022 6:48 PM, elecraft-requ...@mailman.qth.net wrote:
Message: 15
Date: Sun, 24 Apr 2022 15:40:30 -0500
From: Jack Brindle
To: email
Cc:"elecraft@mailman.qth.net"
Subject: Re: [Elecraft] K4D - KPA500 Fault Question + wish
Message-ID:
Content-Type: t
Jack,
OK, you win.
I went back to fan speed (0) NOR and with FT8 at 400+ watts, the KPA500
is only "doing" 56C max AND fan speed (2) is maxing also at 56C. So,
yes I will run the fan at (0) NOR.
Also, "rest" for NOR is 44C.
73, steve WB3LGC
On 24-Apr-22 05:21 PM, email wrote:
Jack,
Is there data showing more dissipated heat with lower output in solid state
amplifiers? I have seen similar posts on the SPE Expert list. The following
KPA1500 post shows much lower efficiency with lower power but not more lost
wattage: I am not an RF amp guru, I am just trying to understand
Jack,
Now that you ask.
I have been using the fan at (1) when I run FT8 to "get a head start"
when I do TX. I don't NEED to. I like to see lower TEMP and it does.
I have been known to run 400W on FT8, too (FT8 is low signal mode not
QRP) and I have been trying to get a Dallas station DE
If there was no recent “HI TEMP” fault in the log, then it was not the KPA500
that caused the display on the K4.
In that case, ask the K4 folks what may have happened.
I have never seen a HI TEMP fault with my KPA500s in normal operation, although
I am sure others have.
I have seen it when
On 4/24/22 15:06, Jack Brindle wrote:
Steve;
Use the KPA Utility to see the KPA faults. Access is under the Configuration
tab, then click on “Display Fault Table”.
You can also save it to a file for view in a text editor, or if we ask for it,
send it to tech support for analysis.
Thanks, I
Steve;
Use the KPA Utility to see the KPA faults. Access is under the Configuration
tab, then click on “Display Fault Table”.
You can also save it to a file for view in a text editor, or if we ask for it,
send it to tech support for analysis.
The FAN CTL sets the minimum fan speed. It works
Yesterday I got a fault message on the K4 screen. It disappeared before
I could see it fully, but I did get "tighten heatsink screws". The fan
was working as its speed was speeding up and the KPA500 temp saw about
60+C (it may have been higher). I was running 100 watts PSK31. The
KPA500 did
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