This is not unusual when the loads presented by the antennas (or tuner) to the
amp are different. This can even be true when the SWRs are identical if the
actual +/- reactance of one is different than the other.
This is most noticeable on lower freq bands where the amps gain is typically
Based on my experience, the KPA1500 is very sensitive to small changes
in load impedance (SWR) with respect to power gain and current. The ATU
software is much better than it started out, but still sometimes doesn't
get below 1.2:1. That could result in the kind of power gain variation
Pete is
Actually the fact that you were using the internal tuner doesn't change the
chance that with the settings on the auto tuner don't tell you which
direction the tuning of a certain antenna approach unity from. So there
could be twice the variation allowed between the 2 antennas. So if one is
coming
Thanks to everyone who replied, either directly or on the list. I'm
sorry, but I forgot to mention one key fact - I was running the amp's
ATU with both of these antennas. Assuming that the amp's power output
measurement is done at the input of the ATU and not the output, and that
the ATU
I have two 40M antennas, a Carolina Windom and a full-wave parasitic
sloper. I have just noticed that on any given frequency, my K3 must
deliver considerably more power on one than the other, in order for the
amp to produce 1500 watts. The difference is 27 watts on one vs 42
watts on the
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