I also had problems reading the K2 display when nulling C55. For me it was much easier to find the null by using a DC voltmeter to measure the reflected voltage signal into the PIC on the KAT2. My memory says it was pin 4, but check the schematic to be sure.
Also, be very sure you have a good 50ohm dummy load connected to the antenna output. Mark AD5SS On 10/26/05, Rolf Moberg <[EMAIL PROTECTED]> wrote: > I've been using my K2 with KSB2 several months now. KAT2 was ordered and > built in this week. > > Some problems: > Page 16 in KAT2 manual, Bridge Null Adjustment (C55) > > I didn't get any better reading in adjustment. CALn was 010. Tuning was > very sharp and it was not easy to find the best value. > > Power calibration in page 17 was the next problem. I dont't have good > external power meter so I tried calibration with RF probe. There weren't > any written instructios where to connect RF probe's crocodile clip and > where to touch by probe tip. I guessed and tried power calibration by > measuring DC voltage with probe from KAT2 J1 antenna jack soldering > terminals. However, when setting requested power to 5W and doing CALP I > noticed power level in LCD display was climbing smoothly from 6W to > upwards. DMM told the voltage in the beginning was about 12.8V and it > was goind up smoothly. Adjusting R1 (forward potentiometer) didn't help > to get any more clever or better voltages. > > I decided to borrow a good wattmeter from somewhere. And re-installed > the top cover. Power calibration will be done later. I wanted to test > KAT2 antenna switch and antenna tuning. > > Antenna switch is working. The big question are the relays. I can hear > them clicking when scrolling through ATU menu as described in manual. > However, no relay clicks are heard when pressing TUNE in CALP mode. Why? > > Please help! > > Rolf Moberg > > _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
