[Elecraft] KPA1500 Drive Power

[john at kk9a.com]

My KPA500 also has slightly inconsistent output. If I recall output drops
a little after the first few seconds of key down. Perhaps it is normal for
solid state amps as I have never noticed this with a tube amp. This may be
more of a concern with a legal limit amp if you want to keep it as close
to 1500 watts without going over.

John KK9A

Bill Stravinsky k3wjv wrote:

 Yup, as the temp climbs the output drops some.  Even though I'm glad I
got the solid state amp I still prefer tubes, hi.  The drop is anywhere
between 100 to maybe 300 watts.I never really noted the exact numbers.
BillK3WJV
p.s. I'm thinking its a normal solid state thing.

    On Wednesday, May 30, 2018, 4:23:47 PM EDT, K9MA <k9ma at
sdellington.us> wrote:

 I'm using the K3 with the Elecraft interface cable.  I've noticed the
the CW drive power required by mine varies considerably, both with
temperature and SWR.  If I set the K3 output for a KPA1500 output of
1500 W output initially, the output will drop to perhaps 1100 W when the
temperature stabilizes at around 65 C.  (I've ruled out any change in
antenna impedance, etc.)  A similar change occurs if the SWR goes from
1:1 to 1.2:1 when changing frequency or switching antennas.  I haven't
changed the ALC from the default setting.  Has anyone else noticed this?

73,

Scott K9MA

-- 
Scott  K9MA

k9ma at sdellington.us