Re: [Elecraft] Tuning noise on K2 - 40M
Dave, My K2 also produces clicks on 40m which disappear if the antenna is disconnected or turned away from strong BC stations above 7100 kHz. Running CAL PLL has not cured the problem, and I have since found the same problem on 15m. It might exist on other bands but I have not had the time to check. I have a *suspicion* that strong signals from the antenna / banspass filters reach the VCO and Reference oscillator area of the RF board by some direct route, not via the Preamp / attenuator / mixer and momentarily 'upset' the VCO causing the click. The VCO (VFO) could be upset if some product produced by multiple mixing attempted to take over control of the loop, sometimes a problem with locked loops. But I cannot confirm this yet due to lack of time at the moment. 73, Geoff GM4ESD - Original Message - From: Dave-Boat Guy [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Monday, February 12, 2007 1:58 AM Subject: [Elecraft] Tuning noise on K2 - 40M Hi, I was tuning around on 40M this evening and noticed some clicks when I tuned from 7119.82 to 7120.00. I started checking and I noticed this behavior from about 7050 through 7320...every 10 KHz. If I disconnect my antenna this problem goes away. The problem remains if I use the attenuator or change mode or filter settings. Disabling the AGC or changing from slow to fast has no effect. This appears to be only happening on 40M. Since the problem goes away when I remove the antenna, I'm wondering if it is due to some mixing product although it happens even when the band is quiet...but the antenna is connected. Any ideas? Thanks in advance. Dave ___ 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] Tuning noise on K2 - 40M
I think this is the known feature described by Wayne in: http://www.ac6rm.net/mailarchive/html/elecraft-list/2000-03/msg01007.html 73 Kevin w9cf My K2 also produces clicks on 40m which disappear if the antenna is disconnected or turned away from strong BC stations above 7100 kHz. Running CAL PLL has not cured the problem, and I have since found the same problem on 15m. It might exist on other bands but I have not had the time to check. I have a *suspicion* that strong signals from the antenna / banspass filters reach the VCO and Reference oscillator area of the RF board by some direct route, not via the Preamp / attenuator / mixer and momentarily 'upset' the VCO causing the click. The VCO (VFO) could be upset if some product produced by multiple mixing attempted to take over control of the loop, sometimes a problem with locked loops. But I cannot confirm this yet due to lack of time at the moment. 73, Geoff GM4ESD ___ 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] Tuning noise on K2 - 40M
Many thanks for the lead. Strangely the frequency separation between adjacent clicks seems to be related to the number, separation and strengths of strong received signals. Also on occasion when tuning through a 40m BC station whose received carrier level is in the region of -10dbm, the receiver will lock onto the BC signal and not let go until it has been tuned further a few kHz, typical is approx 3 kHz and always (I think) down in frequency, then a 'plop'. This is why I have the *suspicion* previously mentioned. 73, Geoff GM4ESD - Original Message - From: Kevin Schmidt [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Monday, February 12, 2007 9:06 PM Subject: Re: [Elecraft] Tuning noise on K2 - 40M I think this is the known feature described by Wayne in: http://www.ac6rm.net/mailarchive/html/elecraft-list/2000-03/msg01007.html 73 Kevin w9cf My K2 also produces clicks on 40m which disappear if the antenna is disconnected or turned away from strong BC stations above 7100 kHz. Running CAL PLL has not cured the problem, and I have since found the same problem on 15m. It might exist on other bands but I have not had the time to check. I have a *suspicion* that strong signals from the antenna / banspass filters reach the VCO and Reference oscillator area of the RF board by some direct route, not via the Preamp / attenuator / mixer and momentarily 'upset' the VCO causing the click. The VCO (VFO) could be upset if some product produced by multiple mixing attempted to take over control of the loop, sometimes a problem with locked loops. But I cannot confirm this yet due to lack of time at the moment. 73, Geoff GM4ESD ___ 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] Tuning noise on K2 - 40M
Hi, I was tuning around on 40M this evening and noticed some clicks when I tuned from 7119.82 to 7120.00. I started checking and I noticed this behavior from about 7050 through 7320...every 10 KHz. If I disconnect my antenna this problem goes away. The problem remains if I use the attenuator or change mode or filter settings. Disabling the AGC or changing from slow to fast has no effect. This appears to be only happening on 40M. Since the problem goes away when I remove the antenna, I'm wondering if it is due to some mixing product although it happens even when the band is quiet...but the antenna is connected. Any ideas? Thanks in advance. Dave We won't tell. Get more on shows you hate to love (and love to hate): Yahoo! TV's Guilty Pleasures list. http://tv.yahoo.com/collections/265 ___ 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
