Thanks, Don. Your diagnosis was correct. Voltages are now right and the receiver hears for the first time. Thanks for being there with all of your Elecraft knowledge!
73, Dave N7AF ----- Original Message ----- From: "W3FPR - Don Wilhelm" <[EMAIL PROTECTED]> To: "Cyberider" <[EMAIL PROTECTED]>; <[email protected]> Sent: Saturday, April 02, 2005 11:51 AM Subject: RE: [Elecraft] Alignment and Test Part 2 > Dave, > > You did anticipate my next question, and now I believe I can say that Q3 has > been somehow zapped since it appears to be conduction with a very low > voltage on the gate. Replace it with the 2N7000 that remains unmounted in > your K2 parts and request a replacement from Elecraft so you can fill the > holes at Q10 on the RF board later. I beileve that will fix your problem. > > 73, > Don W3FPR > > > -----Original Message----- > > > > Thanks for the reply, Don. > > > > D6 and D7 are oriented properly. > > > > I am measuring 7.94 volts on the collector of Q1 and 7.15 volts on the > > collector of Q2. > > > > Anticipating your next question, on Q3 I am measuring: S=0 > > G=47mV D=51 mV. > > D should be 8 volts according to the manual. > > > > Tnx & 73, > > Dave > > N7AF > > > > ----- Original Message ----- > > From: "W3FPR - Don Wilhelm" <[EMAIL PROTECTED]> > > To: "Cyberider" <[EMAIL PROTECTED]>; <[email protected]> > > Sent: Saturday, April 02, 2005 10:49 AM > > Subject: RE: [Elecraft] Alignment and Test Part 2 > > > > > > > Dave, > > > > > > It would appear from those readings that either you have D6 or D7 > > installed > > > backwards or that both the 8R and 8T voltage lines are active, and they > > > should be mutually exclusive. > > > > > > First check the diode orientation against the Parts Placement Diagram in > > the > > > rear of your manual, and if these are correct, measure the sources of 8R > > and > > > 8T at the collectors of Q1 (8T) and Q2 (8R) on the Control > > Board. If both > > > are near 8 volts at the same time, you have a problem with the > > controlling > > > circuit in the base of Q1. > > > > > > Let us know what you find and we can proceed from there. > > > > > > 73, > > > Don W3FPR > > > > > > > -----Original Message----- > > > > > > > > I am not getting any significant signal input from the antenna > > > > and the loss seems to be at D6. In trying to determine whether > > > > D6 is at fault, I'm measuring 7.13 volts on the anode and 7.31 > > > > volts on the cathode. The manual indicates they should be 8.0 > > > > and 7.5 volts respectively. On D7, I'm measuring 7.94 volts on > > > > the anode and 7.31 volts on the cathode. The manual indicates > > > > 0.0 (error?) and 7.5 volts respectively. Before I blame D6 for > > > > the loss of signal, is there something else going on here that > > > > may be causing the problem? > > > > > > > > Thanks, > > > > Dave > > > > N7AF > > > > > > > > > > > > > > > > _______________________________________________ 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
