Re: [Elecraft] RF feedback problems with P3 and external keyboard
I might suggest that folks do not neglect that the RF may be getting into the keyboard, causing its microcontroller to crash. Remember that we live in an "Everything is a computer" world. - Brendon KK6AYI On Sun, Nov 26, 2017 at 10:22 AM, Jim Brown wrote: > Good advice, Kevin, especially winding as many turns as practical. I > wouldn't add the extension unless a choke without it didn't solve the > problem. > > 73, Jim K9YC > > On 11/26/2017 8:52 AM, Kevin Stover, AC0H wrote: > >> The mix of the toroid's used does matter. Mix 31 is best. >> >> Here is what I did with a USB mouse. >> I bought four mix 31 snapon's and installed two 18 inches back from the >> mouse and another pair 18 inches back from the connector, winding as many >> turns as would fit. I bought a USB extension cable and wound most all of it >> on a mix 31 2.4 inch toroid. This choke was installed on the computer end >> and the choked mouse cable was plugged into that. >> >> All of this assumes you have things properly bonded, especially the >> computer case/chassis. >> > > > __ > 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 bren...@whateley.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] RF feedback problems with P3 and external keyboard
Good advice, Kevin, especially winding as many turns as practical. I wouldn't add the extension unless a choke without it didn't solve the problem. 73, Jim K9YC On 11/26/2017 8:52 AM, Kevin Stover, AC0H wrote: The mix of the toroid's used does matter. Mix 31 is best. Here is what I did with a USB mouse. I bought four mix 31 snapon's and installed two 18 inches back from the mouse and another pair 18 inches back from the connector, winding as many turns as would fit. I bought a USB extension cable and wound most all of it on a mix 31 2.4 inch toroid. This choke was installed on the computer end and the choked mouse cable was plugged into that. All of this assumes you have things properly bonded, especially the computer case/chassis. __ 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] RF feedback problems with P3 and external keyboard
I had RF problems with my P3 Keyboard also. I also used snap on mix 31’s and solved the problem. Then decided to use a wireless keyboard and that solved the problem. I felt the rf was getting in by the order as it was a cheap keyboard and the cord was very thin. Hope this helps you with some ideals Gerald From: Kevin Stover, AC0H Sent: Sunday, November 26, 2017 10:54 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] RF feedback problems with P3 and external keyboard The mix of the toroid's used does matter. Mix 31 is best. Here is what I did with a USB mouse. I bought four mix 31 snapon's and installed two 18 inches back from the mouse and another pair 18 inches back from the connector, winding as many turns as would fit. I bought a USB extension cable and wound most all of it on a mix 31 2.4 inch toroid. This choke was installed on the computer end and the choked mouse cable was plugged into that. All of this assumes you have things properly bonded, especially the computer case/chassis. On 11/24/2017 2:34 PM, ANDY NEHAN wrote: > After LOTS of experimentation I think I have found that just recently I have > some RF feedback into the usb keyboard on the rear of the P3. This manifests > itself particularly badly with the Genovation keyboard but is also present > with a standard usb keyboard. Oddly enough it is MUCH worse when using the > Perwerx psu than my linear psu - but that may of course be due to different > cable layout for the power cables. I have applied clip on ferrites with great > enthusiasm but to no avail. > I noticed a message on my external vga screen saying "usb device removed" > shortly after starting to transmit and then shortly after that (but whilst > still transmitting) "usb device connected". This is also not present when on > low power (say 5 watts) but reappears at 20 watts. > Has anyone else experienced this problem?? > Andy > > > > __ > 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 ksto...@ac0h.net > -- R. Kevin StoverAC0H FISTS #11993 SKCC #215 NAQCC #3441 ARRL __ 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 kc6...@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] RF feedback problems with P3 and external keyboard
The mix of the toroid's used does matter. Mix 31 is best. Here is what I did with a USB mouse. I bought four mix 31 snapon's and installed two 18 inches back from the mouse and another pair 18 inches back from the connector, winding as many turns as would fit. I bought a USB extension cable and wound most all of it on a mix 31 2.4 inch toroid. This choke was installed on the computer end and the choked mouse cable was plugged into that. All of this assumes you have things properly bonded, especially the computer case/chassis. On 11/24/2017 2:34 PM, ANDY NEHAN wrote: After LOTS of experimentation I think I have found that just recently I have some RF feedback into the usb keyboard on the rear of the P3. This manifests itself particularly badly with the Genovation keyboard but is also present with a standard usb keyboard. Oddly enough it is MUCH worse when using the Perwerx psu than my linear psu - but that may of course be due to different cable layout for the power cables. I have applied clip on ferrites with great enthusiasm but to no avail. I noticed a message on my external vga screen saying "usb device removed" shortly after starting to transmit and then shortly after that (but whilst still transmitting) "usb device connected". This is also not present when on low power (say 5 watts) but reappears at 20 watts. Has anyone else experienced this problem?? Andy __ 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 ksto...@ac0h.net -- R. Kevin StoverAC0H FISTS #11993 SKCC #215 NAQCC #3441 ARRL __ 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] RF feedback problems with P3 and external keyboard
I haven't connected a keyboard to my P3 yet, but I have had issues with the shack PC. It's been fine on 160m thru 20m but I had issues above 20m when I changed keyboards. As the original keyboard that I used was OK re-connected it and forgot about it. Last Wednesday with the original keyboard connected, I was on 20 metres when the lights on the keyboard went off and there was no output to the PC. I found the cure was to use a large Type 31 ferrite ring and wind 4 turns of the keyboard USB cord onto it, right close to the USB connector at the PC end. Perhaps this will help you with your P3 issue. 73, Alan. G4GNX -Original Message- From: ANDY NEHAN Sent: Friday, November 24, 2017 8:34 PM To: elecraft@mailman.qth.net Subject: [Elecraft] RF feedback problems with P3 and external keyboard After LOTS of experimentation I think I have found that just recently I have some RF feedback into the usb keyboard on the rear of the P3. This manifests itself particularly badly with the Genovation keyboard but is also present with a standard usb keyboard. Oddly enough it is MUCH worse when using the Perwerx psu than my linear psu - but that may of course be due to different cable layout for the power cables. I have applied clip on ferrites with great enthusiasm but to no avail. I noticed a message on my external vga screen saying "usb device removed" shortly after starting to transmit and then shortly after that (but whilst still transmitting) "usb device connected". This is also not present when on low power (say 5 watts) but reappears at 20 watts. Has anyone else experienced this problem?? Andy __ 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] RF feedback problems with P3 and external keyboard
After LOTS of experimentation I think I have found that just recently I have some RF feedback into the usb keyboard on the rear of the P3. This manifests itself particularly badly with the Genovation keyboard but is also present with a standard usb keyboard. Oddly enough it is MUCH worse when using the Perwerx psu than my linear psu - but that may of course be due to different cable layout for the power cables. I have applied clip on ferrites with great enthusiasm but to no avail. I noticed a message on my external vga screen saying "usb device removed" shortly after starting to transmit and then shortly after that (but whilst still transmitting) "usb device connected". This is also not present when on low power (say 5 watts) but reappears at 20 watts. Has anyone else experienced this problem?? Andy __ 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
