Re: [Elecraft] K1 Problems
Steve, The quickest way to do the alignment is to use an RF Probe or an oscilloscope with a 10X probe. First probe band board P1 pin 6 and peak for maximum RF on both bands. The can be done in receive. Then connect a dummy load and do a TUNE at about 1.5 watts. Connect a probe to band board P2 pin 8. First on band 1, adjust L5 and L6 for a peak - then refine the adjustment of L1 and L2 to maximize that peak. Do the same for Band 2 - adjust L7 and L8 for a peak, and then refine the adjustment of L3 and L4. Do you have power output? refine the adjustment of L7 and L8 on Band 2 and adjusting for maximum power - an external QRP wattmeter is handy for that step. Switch to Band 1 and refine the adjustment of L5 and L6 for maximum power output. When you have done that, the band board has been aligned the best it can be. If you still have a receive problem it is somewhere other than the band board. I am not sure what you mean by "C2 Gain tweek" -- C2 is a fixed capacitor in the VFO. If you meant C20, then that shifts the BFO, and it should be set to center the signal in your receive passband. You can adjust C20 - while receiving your local signal, adjust the VFO to maximize the signal, without regard for the pitch (do this with the narrowest K1 filter set). After doing that, adjust C20 so that you hear the signal at your preferred pitch. Make sure the sidetone (in the menu) is set for that same pitch. 73, Don W3FPR On 6/20/2020 3:47 PM, Stephen Roberts wrote: I'm suddenly out of a signal. I get hiss but no signal. I'm using a k1 fil 2 40/20 board. I was getting weak gain on the 40m side so went in to peak the L1/L2 L5/L6 Inductors. I messed about with them but was unable to peak them as I heard no change in the volume of the hiss. I also tried C2 Gain tweak and not joy there either. I hear no change in the hiss volume as I turn it. I rigged up my 7300 with a dummy load and xmitted on 7050 and 14050 and heard a signal but still no effect by changing L1/L2 or L5/L6 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K1 Problems
Hi Steve, Is the problem on both 20 and 40? If only one band check the band crystal on the filter board. C2 on the filter board is a fixed cap - no tweaking! ;-) Also check connectors J6 and J7 on filter board. Bad connection - use some DeOxit5 cleaner. Start with alignment according to the manual, if you haven't done that. Good luck! Bert VE3NR On 2020-06-20 15:47, Stephen Roberts wrote: I'm suddenly out of a signal. I get hiss but no signal. I'm using a k1 fil 2 40/20 board. I was getting weak gain on the 40m side so went in to peak the L1/L2 L5/L6 Inductors. I messed about with them but was unable to peak them as I heard no change in the volume of the hiss. I also tried C2 Gain tweak and not joy there either. I hear no change in the hiss volume as I turn it. I rigged up my 7300 with a dummy load and xmitted on 7050 and 14050 and heard a signal but still no effect by changing L1/L2 or L5/L6 I pulled the band board looking for any issues with soldering or whatever and found nothing. Put the board back in and now I get zip. No receive at all, just hissing. It was working fine yesterday although I felt the gain was very low and needed adjustment which led me to this point in time. Suggestions on how to get it going again? 73 Steve, W1SFR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to ve...@bell.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] K1 Problems
I'm suddenly out of a signal. I get hiss but no signal. I'm using a k1 fil 2 40/20 board. I was getting weak gain on the 40m side so went in to peak the L1/L2 L5/L6 Inductors. I messed about with them but was unable to peak them as I heard no change in the volume of the hiss. I also tried C2 Gain tweak and not joy there either. I hear no change in the hiss volume as I turn it. I rigged up my 7300 with a dummy load and xmitted on 7050 and 14050 and heard a signal but still no effect by changing L1/L2 or L5/L6 I pulled the band board looking for any issues with soldering or whatever and found nothing. Put the board back in and now I get zip. No receive at all, just hissing. It was working fine yesterday although I felt the gain was very low and needed adjustment which led me to this point in time. Suggestions on how to get it going again? 73 Steve, W1SFR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
