[Elecraft] K1 Low power output on one band - Now Solved
Thanks to Don and Michael for their advice on the K1. It was indeed a simple tweak of one of the caps on the filter board (pre-mix) and now all seems well with my K1. 73, Paul EI5KI __ 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 Low power output on one band
Paul, Yes, it does sound like your 4 band filter board needs to be re-aligned. Remove the KAT1 and install the jumper. In addition, you must set the switch next to the BNC connector to the K1 setting in order to maintain power control. If you do not have that switch, then you have an older K1 board and you must re-attach R36 on the bottom of the RF Board. 73, Don W3FPR On 7/12/2023 5:06 AM, Paul Barlow wrote: Dear Elecrafters, I'd like some advice before I go delving into something and making it worse! I have taken my 4 band K1 out of storage. It is set up for 40m, 30m, 20m and 15m. It also has the auto ATU. On checking it out I find output as expected on 40m & 30m - 5W set gives 5W out on my dummy load. But on 20m I'm only getting about 1W out for 5W set, on 15m I get an indicated 4W. My first guess is that I need to revisit the tuning of the trimmers on the filter board of the 15m and 20m (the manual reminds me to trim 15m first) bands. I need to remove the ATU to do this and I find in my manual a cryptic note to say I need to move a jumper on P3. I think that will then route the RF to the antenna rather than to the not connected ATU. Any more advice would be helpful before I dive in. 73, Paul EI5KI __ 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 w3fpr...@gmail.com __ 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 Low power output on one band
Hi Paul, It does sound as though the slug-tuned inductors on the 20 meter and 15 meter sections of the Filter board need tweaking. As you noted, one must remove the KAT1 ATU board from the Filter board to access those coils. It is necessary to jumper pins 2 and 10 of J2 on the Filter board to route RF to the antenna connector. Once you've done that you can proceed with the alignment as described in the manual. 73, Mike, K8CN __ 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 Low power output on one band
Dear Elecrafters, I'd like some advice before I go delving into something and making it worse! I have taken my 4 band K1 out of storage. It is set up for 40m, 30m, 20m and 15m. It also has the auto ATU. On checking it out I find output as expected on 40m & 30m - 5W set gives 5W out on my dummy load. But on 20m I'm only getting about 1W out for 5W set, on 15m I get an indicated 4W. My first guess is that I need to revisit the tuning of the trimmers on the filter board of the 15m and 20m (the manual reminds me to trim 15m first) bands. I need to remove the ATU to do this and I find in my manual a cryptic note to say I need to move a jumper on P3. I think that will then route the RF to the antenna rather than to the not connected ATU. Any more advice would be helpful before I dive in. 73, Paul EI5KI __ 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
