Thanks again, Don. I've been using Elecraft's signal injector; you may know it puts out 50 micro volts on the high setting. I'll try your suggestions but I think I did part of them already. BTW, I'm using my Android phone so it's tough to write a lot of detail.
Les On Aug 22, 2014 11:05 AM, "Don Wilhelm" <[email protected]> wrote: > Les, > > You did not mention your test gear nor any information about your setup, > so I have to make some guesses and ask some groundwork questions. > > Are you injecting RF from a signal generator to the BNC jack? If so, is > that signal large enough to register on what you are using to determine > signal or no signal ('scope with 10X probe or RF Probe)? > Do you have the jumper installed in J2 of the band board? > > Turn the signal generator off, then on while observing the level at band > board J8 pin 8 - you should see a rise in the RF being measured. If not, > the signal level is too low to register on your measurement device. > > The Signal Tracing section starting on page 5 of the K1 manual appendix > gives you an orderly sequence for troubleshooting. Where does the signal > level drop below the expected level? That point is just past the point of > failure. > > 73, > Don W3FPR > > On 8/22/2014 1:03 PM, Les Garwood wrote: > >> Dear Fellows, >> >> I just finished construction of my K1. The receiver stage worked >> perfectly >> until I finished the transmitter stage. I still get audio hiss and volume >> but no signal on any band, AGC on or off, attenuator on or off. >> All the voltages and resistances check out except the anode of D9, >> according to the manual, is supposed to be > 100k. I'm sure this is an >> error, however, since the DC path to ground from that point goes through >> three resistors and a choke totalling only about a couple K, which is >> what >> I measure. >> I still get rf out of the VFO, and can trace it through the filter board, >> J6, at pins 1,2 and 6, with my scope. However, there is no trace of >> signal rf from the antenna on pins 1 or 8 of J7. >> >> I have no rf at the attenuator relay either, at pin 3, or any other. >> >> I can't quite figure out yet how the TR switch circuit works (or doesn't >> perhaps) so it's hard to troubleshoot if it is the problem or not. >> >> Needing the filter board in place makes trouble shooting all the harder >> too. I wish I had a layout view showing the bottom of the rf board to >> help. >> >> As always, any comments welcome and appreciated. >> >> >> > ______________________________________________________________ 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 Message delivered to [email protected]
