[Elecraft] K2 SSB Watery Audio Distortion
There has always been some watery distortion on my SSB signal from my K2/100. It is there with or without the KPA100. It is there with three different mikes. It is there with two different KSB2 modules. It is there on both upper and lower sideband. The CW signal sounds pretty good, no obvious problem. The SSB distortion is not real bad, but noticeable. The ALC is high and has a hard time settling down on 80M. It settles to two bars but may start at 6 or 7 bars. The ALC on 10M is just one bar. The watery distortion is on all bands 80M thru 10M and into a dummy load. I assume the problem is not KPA100, KSB2, mikes, or RF getting in. The problem has been there for years (sn 3194) but has worked it's way up the fix list. At this point I'm not sure where to start. Suggestions welcomed! 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
Re: [Elecraft] K2 SSB Watery Audio Distortion
John, You said it is there with and without the KPA100. Have you physically removed the KPA100 and tried it with just the base K2? If not, please try that. Should the base K2 be clean, re-install the KPA100, but after it is installed, remove the right side panel and fold/tuck the ribbon cable and the speaker cable into the area near where the ribbon cable attaches to the control board. Often such a watery sound is caused by coupling from the ribbon or speaker back into the KSB2 board - dressing the ribbon and speaker cables away from the KSB2 fixes it. That is at least a starting point. 73, Don W3FPR John Huffman wrote: There has always been some watery distortion on my SSB signal from my K2/100. It is there with or without the KPA100. It is there with three different mikes. It is there with two different KSB2 modules. It is there on both upper and lower sideband. The CW signal sounds pretty good, no obvious problem. The SSB distortion is not real bad, but noticeable. ___ 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 SSB Watery Audio Distortion
Hello John If you have another ssb receiver available that can tune to the K2 IF frequency, try listening to ssb directly out of the KSB2 and see if it is watery there. If not, the problem lies elsewhere in the rig. If it is watery, which I doubt it will be, since you say you get the same result with two different KSB2 modules, then the problem may be in the KSB2s. Also check the stability of the oscillators by listening to them. Is there any warble at all in their frequencies? Good luck and 73 Bob N6WG - Original Message - From: John Huffman [EMAIL PROTECTED] To: Elecraft List elecraft@mailman.qth.net Sent: Friday, May 16, 2008 7:12 AM Subject: [Elecraft] K2 SSB Watery Audio Distortion There has always been some watery distortion on my SSB signal from my K2/100. It is there with or without the KPA100. It is there with three different mikes. It is there with two different KSB2 modules. It is there on both upper and lower sideband. The CW signal sounds pretty good, no obvious problem. The SSB distortion is not real bad, but noticeable. The ALC is high and has a hard time settling down on 80M. It settles to two bars but may start at 6 or 7 bars. The ALC on 10M is just one bar. The watery distortion is on all bands 80M thru 10M and into a dummy load. I assume the problem is not KPA100, KSB2, mikes, or RF getting in. The problem has been there for years (sn 3194) but has worked it's way up the fix list. At this point I'm not sure where to start. Suggestions welcomed! 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 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
