Hi Don,
Thanks for yoor previous comments re the low output power from my KPA100.
I have checked all low pass filter components and they are fine.
Using an MFJ259 and having checked that MFJ output freq matches freq on K2
ie MFJ is aligned, I scanned low pass filters. Here is the synopsis of the
SWR:
160m - Approx 1.0 from below 1.73MHz to 2.25MHz, climbs to 1.5 at 2.50MHz
80m - Approx 1.0 from 2.00MHz, starts climbing at 3.25MHz but approx 1.1 to
4.00MHz
40m/30m - Approx 1.0 from 5.00MHz, starts climbing at 9.25MHz (1.2),
10.00MHz (1.5), 10.8MHz (1.2), dips at 11.00MHz (1.0) and climbs again
11.26MHz (1.2) and 11.36MHz (1.5)
20m/17m - Approx 1.0 from 13.40MHz, starts climbing at 15.00MHz (1.05),
15.50MHz (1.18), 16.00MHz (1.2), 16.50MHz (1.35), past 17.00MHz over 1.5
15m/12m/10m - Approx 1.5 from 20.00MHz to 25MHz, dips 25.50MHz (1.2),
26.00MHz (1.15), 26.50MHz (1.0), stays down and rises at 28.00MHz (1.2),
28.50MHz (1.2), 29.00MHz (1.5)
LPF Analysis and output power:
160m LPF seems OK, output power approx 70W
80m LPF seems OK, output power approx 60W
40m/30m LPF seems too low, output power 60-70W
20m/17m LPF seems low, output power 90W (This seems odd) on 20m, 60W on 17m
15m/12m/10m LPF really odd, looks like a notch filter centred on 27MHz,
output power approx 60W
Something seems to be affecting the LPFs. I can only assume it's the SWR
Bridge or RFC10. Any suggestions?
Mike
VK1KCK
K2#2599
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