[Elecraft] K2-100 Parasitic
While reading a post by Stan, W5EWA and his experince with a problems on the 40 meter band with parasitic occilations, I realized that I was also having the same thing happening to my setup. When using the K2-100 with the KAT100 tuner on the 40 meter band it caused the tuner to act erratic on high power. It would work fine on the low power setting, and would work fine with tuned antennas cut for the band, but when using my 204 foot open wire center fed antenna the tuner would go nut's and cause the radio to reset. Also at times cause some of the presets in the K2 to change when it reset. I could bypass the KAT100, and using my home brew tuner the parasitic would not show up. Tom Hammond, N0SS offered a possible soultion for Stan, so I e-mailed Tom to see what help he could offer. Tom sent me a proposed modifcation to the KAP-100 amp. the required moving the RFC10 that's mounted on the SO-239 over so it is not covering the open slot on the PC board. The modifcation was easy to do and cured the problem in my setup. In my case the RFC was only moved about 1/8, which seemed rather insigficant at the time, but it sure made things work in my K2100 - KAP100 combo. Thanks Tom. Kurt K0ARO ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] K2-100 Parasitic
I also have experienced this problem on 3 different K2/100s. I had moved the my KAT100 a couple feet from the K2/100 which reduced the magnitude of the problem. Tuning on low power prevented the problem. After talking to Tom, n0ss, I moved RFC-10 further away from the RF connector (J2). I'm not sure exactly how far I moved it but is was probably 2 or 3 mm. I no longer have the problem. I have moved the KAT100 back beneath the K2/100 and now experience no problems tuning with high power on 40 meters. I have sent the info on this to the present owner of one of the other K2/100s that displayed this problem and will make this mod to the third one in 2 or 3 weeks when the local owner returns to town. After I get my hands on the local one, I'll put a note on the reflector about the results. I really don't know exactly what causes the problem or why moving that RFC a silly little millimeter or 2 corrects the problem, but it worked here! 73, Ken K3IU -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of walter renner Sent: Sunday, May 14, 2006 7:54 AM To: ElecraftList Subject: [Elecraft] K2-100 Parasitic While reading a post by Stan, W5EWA and his experince with a problems on the 40 meter band with parasitic occilations, I realized that I was also having the same thing happening to my setup. When using the K2-100 with the KAT100 tuner on the 40 meter band it caused the tuner to act erratic on high power. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K2-100 Parasitic
Kurt - I've had the same problem. I had assumed RF was getting into my setup on 40 meters. The KAT100 would not find a match and only one LED would light up at a time. It often caused the KDPS2 to disconnect requiring a shut off and on to get it back. Separating the KAT100 from the K2/100 by a couple of feet was a temporary fix. I'll give moving RFC10 a try. Did you move it back away from the back panel? Did you move it closer to T4 on the other side of the board? Did you need to readjust C1 for SWR null? 73 de K1ESE John Tom sent me a proposed modifcation to the KAP-100 amp. the required moving the RFC10 that's mounted on the SO-239 over so it is not covering the open slot on the PC board. The modifcation was easy to do and cured the problem in my setup. In my case the RFC was only moved about 1/8, which seemed rather insigficant at the time, but it sure made things work in my K2100 - KAP100 combo. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] K2-100 Parasitic
Add me to the list of people experiencing the K2/KPA-100/KAT-100 40M high power reset problem. Since my KAT-100 is built into the base of my K2/100 I do not have the option of moving the KAT-100 farther from the K2/100. One observation I made back when I was trying to track the problem down was that it did NOT seem to happen when I ran on a 12V car battery on my desktop but DID happen when I used my Astron 20A switching supply. It was not a conclusive test but I'll try again next week. How many others who are experiencing this erratic 40M behavior (resets the K2 etc) are also using switching supplies? Anyone having problems with a K2/100 and KAT-100 combo ONLY on 40M please contact me off-list and I'll keep track of all those who are affected by this problem. One person is a fluke, two people is a coincidence, three people is a trend and four or more people is a problematic symptom that needs looking into. - Tom K2TA - Original Message - From: Ken K3IU [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Sunday, May 14, 2006 8:28 AM Subject: [Elecraft] K2-100 Parasitic I also have experienced this problem on 3 different K2/100s. I had moved the my KAT100 a couple feet from the K2/100 which reduced the magnitude of the problem. Tuning on low power prevented the problem. After talking to Tom, n0ss, I moved RFC-10 further away from the RF connector (J2). I'm not sure exactly how far I moved it but is was probably 2 or 3 mm. I no longer have the problem. I have moved the KAT100 back beneath the K2/100 and now experience no problems tuning with high power on 40 meters. I have sent the info on this to the present owner of one of the other K2/100s that displayed this problem and will make this mod to the third one in 2 or 3 weeks when the local owner returns to town. After I get my hands on the local one, I'll put a note on the reflector about the results. I really don't know exactly what causes the problem or why moving that RFC a silly little millimeter or 2 corrects the problem, but it worked here! 73, Ken K3IU -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of walter renner Sent: Sunday, May 14, 2006 7:54 AM To: ElecraftList Subject: [Elecraft] K2-100 Parasitic While reading a post by Stan, W5EWA and his experince with a problems on the 40 meter band with parasitic occilations, I realized that I was also having the same thing happening to my setup. When using the K2-100 with the KAT100 tuner on the 40 meter band it caused the tuner to act erratic on high power. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] K2-100 Parasitic
Tom, have you done the N0SS RFC-10 mod yet? Stan Rife W5EWA Houston, TX K2 S/N 4216 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tom Althoff Sent: Sunday, May 14, 2006 8:42 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K2-100 Parasitic Add me to the list of people experiencing the K2/KPA-100/KAT-100 40M high power reset problem. Since my KAT-100 is built into the base of my K2/100 I do not have the option of moving the KAT-100 farther from the K2/100. One observation I made back when I was trying to track the problem down was that it did NOT seem to happen when I ran on a 12V car battery on my desktop but DID happen when I used my Astron 20A switching supply. It was not a conclusive test but I'll try again next week. How many others who are experiencing this erratic 40M behavior (resets the K2 etc) are also using switching supplies? Anyone having problems with a K2/100 and KAT-100 combo ONLY on 40M please contact me off-list and I'll keep track of all those who are affected by this problem. One person is a fluke, two people is a coincidence, three people is a trend and four or more people is a problematic symptom that needs looking into. - Tom K2TA - Original Message - From: Ken K3IU [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Sunday, May 14, 2006 8:28 AM Subject: [Elecraft] K2-100 Parasitic I also have experienced this problem on 3 different K2/100s. I had moved the my KAT100 a couple feet from the K2/100 which reduced the magnitude of the problem. Tuning on low power prevented the problem. After talking to Tom, n0ss, I moved RFC-10 further away from the RF connector (J2). I'm not sure exactly how far I moved it but is was probably 2 or 3 mm. I no longer have the problem. I have moved the KAT100 back beneath the K2/100 and now experience no problems tuning with high power on 40 meters. I have sent the info on this to the present owner of one of the other K2/100s that displayed this problem and will make this mod to the third one in 2 or 3 weeks when the local owner returns to town. After I get my hands on the local one, I'll put a note on the reflector about the results. I really don't know exactly what causes the problem or why moving that RFC a silly little millimeter or 2 corrects the problem, but it worked here! 73, Ken K3IU -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of walter renner Sent: Sunday, May 14, 2006 7:54 AM To: ElecraftList Subject: [Elecraft] K2-100 Parasitic While reading a post by Stan, W5EWA and his experince with a problems on the 40 meter band with parasitic occilations, I realized that I was also having the same thing happening to my setup. When using the K2-100 with the KAT100 tuner on the 40 meter band it caused the tuner to act erratic on high power. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
FW: [Elecraft] K2-100 Parasitic
Tom, I just passed your RFC-10 mod on to Brent, WB4X. I copied the list as well. Stan Rife W5EWA Houston, TX K2 S/N 4216 -Original Message- From: Brent Sutphin [mailto:[EMAIL PROTECTED] Sent: Sunday, May 14, 2006 10:27 AM To: Stan Rife Subject: Re: [Elecraft] K2-100 Parasitic Stan, I am very interested in this mod. I sold my last KAT100 because of this problem. I would like to have another one if I can fix the reset problem. Do you have the info on the mod and if so please email it to me. I just searched Tom's website and did not see it. Thanks Brent WB4X - Original Message - From: Stan Rife [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Sunday, May 14, 2006 9:56 AM Subject: RE: [Elecraft] K2-100 Parasitic Tom, have you done the N0SS RFC-10 mod yet? Stan Rife W5EWA Houston, TX K2 S/N 4216 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tom Althoff Sent: Sunday, May 14, 2006 8:42 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K2-100 Parasitic Add me to the list of people experiencing the K2/KPA-100/KAT-100 40M high power reset problem. Since my KAT-100 is built into the base of my K2/100 I do not have the option of moving the KAT-100 farther from the K2/100. One observation I made back when I was trying to track the problem down was that it did NOT seem to happen when I ran on a 12V car battery on my desktop but DID happen when I used my Astron 20A switching supply. It was not a conclusive test but I'll try again next week. How many others who are experiencing this erratic 40M behavior (resets the K2 etc) are also using switching supplies? Anyone having problems with a K2/100 and KAT-100 combo ONLY on 40M please contact me off-list and I'll keep track of all those who are affected by this problem. One person is a fluke, two people is a coincidence, three people is a trend and four or more people is a problematic symptom that needs looking into. - Tom K2TA - Original Message - From: Ken K3IU [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Sunday, May 14, 2006 8:28 AM Subject: [Elecraft] K2-100 Parasitic I also have experienced this problem on 3 different K2/100s. I had moved the my KAT100 a couple feet from the K2/100 which reduced the magnitude of the problem. Tuning on low power prevented the problem. After talking to Tom, n0ss, I moved RFC-10 further away from the RF connector (J2). I'm not sure exactly how far I moved it but is was probably 2 or 3 mm. I no longer have the problem. I have moved the KAT100 back beneath the K2/100 and now experience no problems tuning with high power on 40 meters. I have sent the info on this to the present owner of one of the other K2/100s that displayed this problem and will make this mod to the third one in 2 or 3 weeks when the local owner returns to town. After I get my hands on the local one, I'll put a note on the reflector about the results. I really don't know exactly what causes the problem or why moving that RFC a silly little millimeter or 2 corrects the problem, but it worked here! 73, Ken K3IU -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of walter renner Sent: Sunday, May 14, 2006 7:54 AM To: ElecraftList Subject: [Elecraft] K2-100 Parasitic While reading a post by Stan, W5EWA and his experince with a problems on the 40 meter band with parasitic occilations, I realized that I was also having the same thing happening to my setup. When using the K2-100 with the KAT100 tuner on the 40 meter band it caused the tuner to act erratic on high power. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] K2-100 Parasitic
I remember this problem from the early days of the KPA100, although not necessarily in connection with the KAT100. I believe there was a builder's alert issued about the RF choke location, but I was unable to find it on the Elecraft Web site. If the KPA100 is old enough that it does not have the side grounding clips and reconfigured shield, there is a modification kit at http://www.elecraft.com/order_form_parts.htm called KPA100SHLDKT. This change was included in KPA100's shipped after June 2003, according to the parts list description. The reconfigured shield has a smaller gap near the SO239 and the RF choke which I believe was intended to fix this problem. Although I don't recall exactly, I think the suggestion in the original Builder's Alert was to mount the RF choke away from the hole in the shield and as close to the chassis as possible. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] K2-100 Parasitic
John, I moved the RFC to the left viewed for the front of the PA board. I moved it very little, as it was almost exactly as that shown on the pictoral in the manaul. 73 Kurt K0ARO (I'll give moving RFC10 a try. Did you move it back away from the back panel? Did you move it closer to T4 on the other side of the board? Did you need to readjust C1 for SWR null?) 73 de K1ESE John ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] K2-100 Parasitic - Success
With thanks to Tom Hammond N0SS for the fix and Kurt K0ARO for finding the problem,, my K2/100 is fixed. It no longer behaves badly. I moved RFC10 away from the coax connector. Before - http://users.adelphia.net/~hjohnc/05140011.JPG After - http://users.adelphia.net/~hjohnc/05140012.JPG Tom has documented the fix on his website. 73 de K1ESE John ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
