Hi,
I am in the final alignment and tests of my K2/SSB/PA100, which seems to be going very well, . but I am facing my first real problem with an Elecraft kit, the 2 T GEN. This is rather frustrating, since there are only a few components, no toroid, etc. The 700 Hz generator works and produces a max 150 mVolt peak signal, but the 1.900 Hz generator does not work. I noticed that Base of 2N3904-Q1 (1.900 Hz) shows 0 V, while Base of 2N3904-Q3 (700 Hz) shows 2,1 mV. With a 8.9 Volts Vcc, Collector Q1 shows 8,1 Volts while Collector Q3 shows 6.7 Volts. Drains Q2 and Q4 (2N7000) show both 4.4 V (= Vcc/2). The voltages of pins 1,2,3,5,6,7 of U1 (LMC6482) are all 4.4 Volts. Replacing Q1 with an available spare didn't help and didn't change the voltages. With the scope, I get a 689 Hz sinusoidal signal on U1 pin 7 (570 mV peak), but nothing on U1 - pin 1. There is a "saw teeth" signal on collector Q3, nothing on collector Q1. I have of course inspected carefully the soldering and the component placement. Thanks for your suggestions, Raymond METZGER F4FNT _______________________________________________ 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
