I just finished the KPA100 for my K2 this week. The K2 and associated accessories were purchased within the last month. Without the KPA100, I get 10W or more on each band. Most bands provide about 15W, but 10M barely makes the 10W rated output with about 10.5W. I think the K2 is just fine.
I added the KPA100 board this week. I get full power on 20m and below, but I only get about 70W on 17M and above. If I select 50W with the power control, I get 50W out. As I increase power, the amplifier tops out. I'm connected to a good dummy load. The SWR is 1:1. I'm connected to a good 32A power supply.
If I set the power level for 10W, I can only get about 7W on these bands. If I unplug the KPA100 and recheck the K2 alignment, I get more than 10W on all bands as stated above. It seems as if the KPA100 attenuates the RF signal at frequencies above 18mhz. I've inspected the low-pass filters for poor solder joints, incorrect number of windings or wrong parts. Everything looks good to me.
Any ideas?
Regards
Rich
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