[Elecraft] KPA1500 Fan Noise - Not An Issue

[WILLIE BABER]

I imagine that if enough heat can be removed fast enough KPA1500 would run key-down forever at 1500 watts output.  That is why fan levels 4 and 5 are so loud, to give those five minutes on (and take five minutes off) without the amplifier overheating and forcing a hard fault.  Hard faults force KPA1500 into standby, to protect itself.  

If you generate excessive forward power the amp will attenuate the excessive power and warn you with a yellow LED.  If you continue to demand excessive power then you will get a hard fault and what sounds like a scream, along with a red LED.  This must mean STOP!

"Dave, Dave.  What are you doing Dave?"

73, Will, wj9b

CWops #1085
CWA Advisor levels II and III
http://cwops.org/

--------------------------------------------
On Tue, 6/5/18, Walter Underwood <wunder at wunderwood.org> wrote:

 Subject: Re: [Elecraft] KPA1500 Fan Noise - Not An Issue
 To: "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
 Date: Tuesday, June 5, 2018, 1:01 AM
 
 I would recommend reading the
 specs. As I remember, it is ICAS, five minutes on, five
 minutes off. But you should check for yourself.
 
 wunder
 K6WRU
 Walter Underwood
 CM87wj
 http://observer.wunderwood.org/ (my
 blog)
 
 > On Jun 4, 2018,
 at 5:06 PM, Paul Baldock <paul at paulbaldock.com>
 wrote:
 > 
 > Can the
 KPA1500 run brick down 100% duty cycle at 1500W while
 maintaining the temperature in a safe range? Anybody tried
 it?
 > 
 > - Paul
 > 
 >
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