[Elecraft] K1 Issue. Lost reception when transmitter stage completed.

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,

Re: [Elecraft] K1 Issue. Lost reception when transmitter stage completed.

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

Re: [Elecraft] K1 Issue. Lost reception when transmitter stage completed.

Les wrote: 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

Re: [Elecraft] K1 Issue. Lost reception when transmitter stage completed.

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

Re: [Elecraft] K1 Issue. Lost reception when transmitter stage completed.

Hi, Yes, Tom had scans of all the legacy gear boards, both top and bottom. They were on the preserved website at http://www.mmccs.com/mmarc/n0ss/, but right now, it looks like the link refers back to the master page. I will try to contact their webmaster to see if that can be fixed. In the

Re: [Elecraft] K1 Issue. Lost reception when transmitter stage completed.

Les, 50 uV is not a large enough signal to see on a 'scope or RF probe. You really need 1.4 volts (or whatever is specified in the procedure) of RF input. I suggest you build the simple oscillator shown in the Signal Tracing appendix of the manual. It has good output for that purpose. The

Re: [Elecraft] K1 Issue. Lost reception when transmitter stage completed.

Helpful once again. I also use a Heatkit signal gen., I didn't mention. It punches up well on my scope. I'll try it again. The scans are what's already on the board, however. These have been useful but limited. Maybe there is something out on the Net that identifies the solder points/pads too.

Re: [Elecraft] K1 Issue. Lost reception when transmitter stage completed.

You mean this link for N0SS signal tracing on the K1? http://www.mmccs.com/mmarc/n0ss/k1_signal_tracing.pdf Mid-Missouri radio club continues to maintain most of Tom’s papers. 72, gene WG7GW __ Elecraft mailing list Home: