Jim,
It would be informative to know where you are observing the power variation.
In the feedline after the KAT1500 with your Bird WM or on the KPA1500
panel display (or the KPA1500 Utility)?
73,
Don W3FPR
On 8/24/2019 3:58 PM, Jim McCook wrote:
Antenna is 2 el. delta. Uses 1/4 wave 70 ohm matching section.
Described in ON4UN's Low Band DXing. Used for 38 years with various
tube amplifiers and no tuners. All coax has been replaced as recently
as 10 years ago. SWR measurements always similar. Power output with
tube amps does not vary visibly on a Bird WM. Same situation currently
with a tube amp substituted. Feedline from matching section about 50
ft. I know how to match antennas.:-) I have seen the usual reactance
measurement on each side of design frequency of 7.025. The built in
tuner is the one I was referencing. The KPA-1500 comes with one.
Jim
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