Bob Henderson wrote:
I like to keep my K2 S/N 997 up to date. I fitted a KPA100 two years
ago and routinely apply other enhancements as they arise. Whilst at
Dayton this year I bought the components to increase the tolerance of
the KPA100 to hi SWR. I have just completed fitting the modkit and
have replaced the firmware with 1.09. Having done so, I decided to
check the power output of the K2/KPA100 against DC current input
accross all bands. As I expected, there is a variation of DC current
input and RF output. However, from 80m thru 10m old 997 produces
90-110W at nominally 20 Amps. The big shock is that on 160m it
produces 110W but draws a huge 30 Amps from the DC supply. Concerned
that I might have a problem with the LPF for 160m, I terminated the
KPA100 LPFs in 50ohms and used my MFJ antenna analyser to check the
SWR of the filter. On 160m it is around 1.2:1. The filters for other
bands are all 1.3:1 or less. It doesn't seem like the problem is the
LPF. I wonder if any other KPA100 owners might have seen this problem
or have a clue to its cause? I should point out that I didn't
measure current input to the rig on 160m prior to applying this mod so
it may quite possibly have already been at that level already.
73 Bob, 5B4AGN
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