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 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
