On Mon,1/16/2017 8:02 AM, Wes Stewart wrote:
Furthermore, IMD performance of the driver (K3) is likely better at
higher power. It's for sure better at 20W than 10W.
Actually, the reason IMD performance is worse at 10W than at 20W is that
at 10W you're still in the 10W section of the radio,
I use the KPA500 utility and just set the Fan to constantly run at a lower
speed, the fan will speed up if needed.
From: Arthur Nienhouse <ka9...@gmail.com>
To: cx...@4email.net; elecraft@mailman.qth.net
Sent: Monday, January 16, 2017 10:13 AM
Subject: Re: [Elecraft] KPA500
When you put the KPA500 into transmit there is some fixed (FET) drain current
regardless of whether you are driving the PA or not. Likewise, the power supply
is supplying this current. So the efficiency is zero and all of this DC power
is converted to heat, not RF. Efficiency increases with
For the NAQP cw party this past weekend, I ran low power. Rather than
'stress' the K3s with 100W, I chose to run 6W thru KPA500, giving me 100w.
During a one hour run period, 125+ Qs on 15m, I noticed the KPA500 temp
at 51C which surprised me. Idle temp in the shack is generally around 33
to 35C.
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