Re: [Elecraft] KPA-1500: Strange Symptoms on FT8
"My Winkeyer has settings for both lead and tail time, and so does N1MM+. WSJT-X does not appear to have these variables." WSJT-X has provision for changing the delay between assertion CAT PTT and onset of audio (settings/advanced/miscellaneous). The delay between end of audio and CAT PTT release is not adjustable but is close to a second. WSJT-X has no control of either of these delays if VOX keying is used. 73, Andy, k3wyc __ 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] KPA-1500: Strange Symptoms on FT8
My Winkeyer has settings for both lead and tail time, and so does N1MM+. WSJT-X does not appear to have these variables. 73, Pete N4ZR On 1/14/2024 11:04 AM, Lou Laderman wrote: Pete, your issue may only be on the back end of the transmission, and adjusting the delay time for the exciter to kick in is on the front end to prevent a hot transmission before the amp kicks in. I don’t know if the back end can be corrected on your exciter, or somewhere in the kpa1500’s menus. I don’t have the issue you reported and haven’t looked through the settings on my K4 or kpa1500. If all else fails, try posting on the kpa1500 groups.io, of ask Elecraft support directly. Lou Laderman (314) 308-4363 Sent from my mobile device On Jan 14, 2024, at 7:28 AM, Pete Smith N4ZR wrote: Interesting idea, Lou. I'll give it a try and see. 73, Pete N4ZR On 1/13/2024 1:07 PM, Lou Laderman wrote: Pete, have you tried increasing the transmit delay between your exciter and the amp? If the exciter continues to transmit briefly after the amp’s relay kicks out, you could see an swr spike. 73, Lou W0FK Lou Laderman Sent from my iPad On Jan 13, 2024, at 10:50 AM, Pete Smith N4ZR wrote: I've been operating 160M FT8 recently, and am noticing some odd symptoms from my amp that seem only to occur in FT8 mode. Even running only about 1170 watts into a good dummy load, with the KPA-1500's ATU bypassed and a displayed SWR of 1.0:1 during transmit, as soon as the transmission ends both the display on the amp and the KPA-1500 utility show SWRs ON RECEIVE of 1.6-1.9:1. I just tested on 80 meters, and am seeing the same anomaly on FT8. This does not happen on CW. The question is, where is this spurious reading coming from, and should I be concerned? 73, Pete N4ZR __ 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 tollader...@icloud.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] KPA-1500: Strange Symptoms on FT8
Pete, have you tried increasing the transmit delay between your exciter and the amp? If the exciter continues to transmit briefly after the amp’s relay kicks out, you could see an swr spike. 73, Lou W0FK Lou Laderman Sent from my iPad > On Jan 13, 2024, at 10:50 AM, Pete Smith N4ZR wrote: > > I've been operating 160M FT8 recently, and am noticing some odd symptoms > from my amp that seem only to occur in FT8 mode. Even running only about > 1170 watts into a good dummy load, with the KPA-1500's ATU bypassed and a > displayed SWR of 1.0:1 during transmit, as soon as the transmission ends both > the display on the amp and the KPA-1500 utility show SWRs ON RECEIVE of > 1.6-1.9:1. > > I just tested on 80 meters, and am seeing the same anomaly on FT8. This does > not happen on CW. > > The question is, where is this spurious reading coming from, and should I be > concerned? > > 73, Pete N4ZR > __ > 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 llader...@icloud.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
[Elecraft] KPA-1500: Strange Symptoms on FT8
I don't have the same equipment as you but I experienced a very similar problem that I initially thought was caused by a problem with my KPA500.However, when I looked at the output of my TS-590S with a scope and spectrum analyzer, I found that it was emitting out of band spurii at the end of each transmission. The signal was clean before keying ended. The problem was only seen on 10 m and 6 m. My KAT500 reported a high SWR at end of transmission because the spike frequency was way off my SteppIR tuned frequency. My TS-590S problem was caused a failed capacitor that changed the rise time of a pin diode bias signal and disrupted switching between TX and RX. It may be a good idea to have a close look at your exciter output signal when TX ends. 73, Andy, k3wyc __ 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] KPA-1500: Strange Symptoms on FT8
I've been operating 160M FT8 recently, and am noticing some odd symptoms from my amp that seem only to occur in FT8 mode. Even running only about 1170 watts into a good dummy load, with the KPA-1500's ATU bypassed and a displayed SWR of 1.0:1 during transmit, as soon as the transmission ends both the display on the amp and the KPA-1500 utility show SWRs ON RECEIVE of 1.6-1.9:1. I just tested on 80 meters, and am seeing the same anomaly on FT8. This does not happen on CW. The question is, where is this spurious reading coming from, and should I be concerned? 73, Pete N4ZR __ 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
