bad audio
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Hello all,
I bought a K2 serial number 5334 some time ago and I have been enjoying the capabilities of the receiver since I got it in the shack. Transmit audio on SSB is another matter. I have tried changing mics and readjusting the BFO for OP1 etc. I continue to get audio reports that I have muffled or distorted audio. In general, the reports are that I am barely understandable in good condition and I can not use the k2 to transmit in poor conditions. I am using a kenwood mc-43s mic currently and have tried the mh2 mic. I get better reports with the kenwood mic. I have tried to monitor my own audio with another receiver but I am not sure even when using a dummy load that I am not getting distortion from overload on the second receiver. But, considering at a .1 watt power level in to a dummy load is not over loading. I hear badly distorted audio that seams to me to have elements of clipping at the peaks of words. And also even when i whistle a single tone I hear multiple tones in the second receiver. In addition, I would have to characterize my audio a generally unpleasing. I have also tried all mic and processor level in the menu., both SSBa and SSbC I have tried every thing I know. I would like to get some input on what to try next. -- Respectfully, William Marshall Denny II _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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-----Original Message----- I bought a K2 serial number 5334 some time ago ... Transmit audio on SSB ... badly distorted audio that seams to me to have elements of clipping at the peaks of words. And also even when i whistle a single tone I hear multiple tones in the second receiver. In addition, I would have to characterize my audio a generally unpleasing. -------------------------- I have K2 SN 5411 with the SSB board & Kenwood mic and it gives me good clean audio on TX. I tested and adjusted mine while monitoring on a 2nd RX and transmitting into a dummy load. Overload was no problem as the bleed from the dummy antenna was strong, but not that strong. I actually recorded the audio from the 2nd RX so I could listen to my TX audio without my own voice rattling around inside my brain. After a few tweaks I had the rig dialed in. I then put the mic away and went back to CW which is where all the fun is :-) Sound like your rig is not right. Does it sound OK on CW? - Keith N1AS - - K2 5411.ssb.100 - - K3 Wave 3 - _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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In reply to this post by William Denny
Marshall,
Are you operating the MC-43 in the 500 ohm position - there is a 50K/500 switch shown in the MC-43 schematic and it should be in the 500 ohm position. How are you handling the mic bias when switching from the MH2 (electret element which needs the bias resistor) and the MC-43 (dynamic element which should NOT have the bias resistor installed. Since you did not build this K2, you may not have the relevant information about the bias resistor. The MH2 needs a 5.6k resistor soldered between pins 1 and 6 on the back of the K2 mic jack, or some other clever means (put the resistor in the MH2 mic plug body) to provide bias for the electret element. I assume you have successfully aligned your filters with Spectrogram. How does the OP1 filter passband look in Spectrogram. It should have a rather flat appearance within the passband. If it looks ragged with a LOT of passband ripple, that is an indication of a faulty crystal in the KSB2 filter. You MUST have SSB FL1 set to the OP1 (or OP2 thru OP5 - they are all the same) filter or TX SSB will sound horrible. Let me know if I can help further. I may not be available by phone, but email does work. 73, Don W3FPR William Marshall Denny II wrote: > Hello all, > I bought a K2 serial number 5334 some time ago and I have been > enjoying the capabilities of the receiver since I got it in the shack. > Transmit audio on SSB is another matter. > > I have tried changing mics and readjusting the BFO for OP1 etc. > I continue to get audio reports that I have muffled or distorted > audio. In general, the reports are that I am barely understandable in > good condition and I can not use the k2 to transmit in poor conditions. > I am using a kenwood mc-43s mic currently and have tried the mh2 mic. > I get better reports with the kenwood mic. > I have tried to monitor my own audio with another receiver but I am > not sure even when using a dummy load that I am not getting distortion > from overload on the second receiver. > But, considering at a .1 watt power level in to a dummy load is not > over loading. I hear badly distorted audio that seams to me to have > elements of clipping at the peaks of words. And also even when i > whistle a single tone I hear multiple tones in the second receiver. In > addition, I would have to characterize my audio a generally unpleasing. > > I have also tried all mic and processor level in the menu., both SSBa > and SSbC > > I have tried every thing I know. > I would like to get some input on what to try next. > > > > Elecraft mailing list Post to: [hidden email] 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 |
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