Posted by
Dave Hachadorian on
Feb 27, 2011; 6:23pm
URL: http://elecraft.85.s1.nabble.com/Elecraft-Power-Ratings-tp6070737p6070796.html
At 45 degrees Celsius, the K3 fans were probably running at speed 2.
I don't like to hear the fans throttling up and down, so I set mine to run
at speed 4 before yesterday's RTTY contest. Not only did they run at
constant speed, keeping things cool, but they gave me the feeling that I
was running big power with all that fan noise. The noise at speed 4 sounds
quite pleasant to me.
The following is a copy of a reflector posting I made on 20090312:
I did an experiment on my two K3's - key down at 100 watts
for four minutes while noting PA Temp and fan speed. Both K3's
behaved
identically and both leveled off at PA Temp = 64C after
about 3 minutes. For the record, here are the results (best
viewed with Courier font):
Time Temp Fan
0:00 26C 0
0:26 37 1
0:44 41 2
1:19 50 3
1:45 55 4
2:40 60 4
2:50 62 4
3:15 64 4
4:00 64 4
Room temp was 77F.
According to the manual, the PA is set to drop into bypass at
84C, so it didn't even come close.
Dave Hachadorian, K6LL
Yuma, AZ
-----Original Message-----
From: Jim Brown
Sent: Sunday, February 27, 2011 11:01 AM
To: Reflector Elecraft
Subject: [Elecraft] Elecraft Power Ratings
I ran an NAQP RTTY contest yesterday, and after CQing on 20M for a while
as it was closing, looked at the PA temperature. It was only 45 degrees
C, well below the point where fans would turn on and/or speed up to
provide more cooling. The K3 is not alone in conservative design -- my
vintage IC746, which I bought many years ago to use on 6M and 2M, is
also rated for 100W in keydown modes, even on 2M.
73, Jim K9YC
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