I have to echo what Paul says. This must be rig specific.
I don't have the elegant equipment he describes, but taking the output
of the K3 to a dummy load (50.1 + j0) and looking at it on an old HP
1740A scope, I see no overshoot on either CW or on SSB using an Elecraft
Proset plugged into the rear connection; CONFIG:r:L BIAS, AF Gain set
for ALC indication of 4-5, CMP settings between zero & 30. At any power
setting I select I get the same result.In SSB, a brief whistle produces
the commanded power display on the scope with no overshoot.
73,
Ken K3IU
Paul Christensen wrote:
Not only SSB. I have overshoot on CW.
This problem appears to be rig-specific. I just duplicated his test
using three wattmeters in series, together with a Bird 4273 RF
sample. The sample feeds a Tektronix SC504 oscilloscope. My
wattmeters are the Alpha 4510, LP-100, and Array PowerMaster. With
the K3 set to 22 watts from the menu, keyer to 30 WPM, I then sent a
single "dit" on 40M CW into a 50-ohm Bird TermaLine load.
Observation: I waited 30 seconds for the ALC to stabilize between
each successive "dit." All three wattmeters read between 22-23 watts
in peak mode. The oscilloscope showed no overshoot whatsoever. I
have no mic to plug into the K3 at the moment, so no SSB overshoot
testing was performed.
Paul, W9AC
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