I am still debugging why the apparently functioning KPA100 has no negative bias going into U4 pin 8. Here are the measurements of U4 pins as well as all of the diodes (in rx)
Any ideas? Neal U4 voltages (rx) P1 = 13.2 P2 = -0.014 p3 = 0 p4 = 0 p5 = 0 p6 = 0 p7 = 0 p8 = -0.214 p9= 0 p10= 0 p11= 0.012 p12= 5.02 p13= 0 p14= 0 p15= 0 p16= 4.9 Diode a/c d1 18.86/21.76 d1 18.0/18.8 d3 15.81/18.04 d4 14.2/15.8 d5 14.0/14.2 d6 13.2/14.0 d7 -0.215/0.15 d8 0.15/0 d9 13.2/13.2 d10 0/13.5 d11 1.58/13.5 d12 0/0.8 _______________________________________________ Elecraft mailing list Post to: [email protected] 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
