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I just completed the upgrade of a very early KPA100 to Rev. A-2, Nov 13, 2006, including the Res kit and improved shield. The upgraded amplifier acts as expected, but seems to have a wide range of total system current draws depending on band. Following the upgrade manual, I did NOT re-tune the amp.
The following measurements are with a well-regulated 13.6 V supply, the KPA-100 set to 100W, and are the total currents in Amps for the K2 (well-loaded), KAT100, and modified KPA-100.
1.825 16.5A
3.525 12.8
7.025 15.1
10.125 18.0
14.025 16.8
18.100 13.5
21.025 15.4
24.900 19.0
28.025 14.7
The SWRs are at or below 1.3. A pre-upgrade reading at UNKNOWN frequency was 14 A.
Is this a normal range of current draw or is there something I should check?
Thanks,
Chris Kimball
NQ8Z (xWB4WZR)
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