[Elecraft] [K2} K2-100 Test and Alignment Issues

[William Moore]

I am now into the test and alignment phases of my just constructed KPA-100
amplifier to be integrated into K2 #3842. Right from the start of this
phase, I have run headlong into a two issues I just can't figure out.

I am constructing from the Revision G September 2010 manual. On the page 47,
the voltage test chart, all measurements are in accordance with the ranges
in the chart except for J3+ lead where instead of 0 volts, I am reading a
stable and consistent 0.044 volts; certainly not a significant voltage but
none the less, it is not zero as called for in the chart.

The second issue is with reference to the C1 SWR Bridge Null Adjustment
described on page 48. Adjusting C1 varies the power output reading on the K2
LCD but does not vary the SWR readout which remains at 9.9 to 1. However,
the SWR/watt meter on my Kenwood AT-200 antenna tuner indicates the K2 is
running 15 watts with an SWR of 1 to 1 into the dummy load, a Heathkit
Cantenna. Twisting the power pot has no effect on the actual power output as
measured on the Kenwood AT-200. Removing the all connections between the K2
and the KPA-100, the K2 functions normally with the power setting pot.

I would really appreciate hearing from anyone who can offer any clues to
what I am doing wrong in conducting these measurements and adjustments or
perhaps identifying a possible construction mistake but gee, I checked so
carefully.

Thank you,

Bill, VE2WMA