I've just completed the build on my internal K2 ATU. I'm at the point of performing the CALn Bridge Null Adjustment. Following the procedures I am unable to get any result other than "HI" unless I turn the power practically down to zero. Turning the power to zero I can get a reading close to 020. However changing C55 doesn't lower or raise the indication. I don't think that the circuit is working as intended. The voltage on pin 1 of U4 is approx. 4.5 volts. With R6 removed.
I've looked over the components a number of times. I've confirmed that all the components in the circuit are the correct values, correctly soldered and in the correct orientation. Including L1. Suggestions? ______________________________________________________________ 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
