Isn't there a rule about using the minimum power necessary?
On 8/17/2018 11:20 AM, Wes Stewart wrote:
Do they?
I have a KPA500, not a '1500 but I run mine full tilt on RTTY.
Something to bear in mind in this discussion is that we run our
equipment in ICAS, not CCS. Even in a contest situation we probably
only transmit half the time. During the off (RX) time the amp isn't
drawing any plate, collector or drain current, nor is it drawing much
current on CW, key up or SSB between syllables. RTTY is a "continuous"
mode without the syllabic breather, but it's still intermittent.
Wes
On 8/17/2018 6:43 AM, j...@kk9a.com wrote:
So why do most RTTY users run their amps at reduced power?
John KK9A
From: Charlie K3ICH
Date: Fri Aug 17 09:24:18 EDT 2018
I really do NOT understand why this data is so surprising.
It all seems to me to be perfectly normal with the amplifier's highest
efficiency occurring at near max output.
Which curiously, I would assume, is the way the amp was designed.
Think zero output with zero drive = zero efficiency.
Apply some drive, read some output and the efficiency goes up from there.
73, Charlie k3ICH
-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at
mailman.qth.net> On
Behalf Of john at kk9a.com
Sent: Friday, August 17, 2018 8:57 AM
To: elecraft at mailman.qth.net
Cc: charles at k5ua.com
Subject: [Elecraft] KPA-1500 Efficiency As A Function of Input Power
Interesting data, Charles. I assumed that running the KPA1500 (or
KPA500)
at lower power would keep the fan from running as much. I knew that
efficiency changed with output power but I did not expect that it was
this
significant. If your data is correct there is 1000++ watts of heat to
dissipate no matter what power level you use.
John KK9A
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