Re: [Elecraft] bad audio at K4XU
>>> On 12/7/2018 11:02 AM, Dick Frey wrote: The only other issue I have is that the low power carrier is 5W when the PWR is set at 12W and jumps to 15W when PWR is set to 13W. It is 100W at the 100W setting. This "smells" like an LPA failure to me. Low power should increase smoothly from 0 to 12 W. The HPA should kick in above 12 W and the power should increase smoothly again. The behavior is very much like severe compression above 5W in the LPA. I would first perform both the LP and HP power calibration. If that does not resolve the issue I would contact Elecraft Support. 73, ... Joe, W4TV On 12/7/2018 11:02 AM, Dick Frey wrote: Okay, I need to be more specific about my "bad audio".. The audio is raspy, like it has rf in it. It is independent of frequency, power, mic type, recorded or not, Hi or Lo mic gain setting, and mic drive level. The only other issue I have is that the low power carrier is 5W when the PWR is set at 12W and jumps to 15W when PWR is set to 13W. It is 100W at the 100W setting. Perhaps the two issues are related. CW operation is unaffected. __ 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] bad audio at K4XU
Good point Fred. Yes the voltage at the radio should be 13 to 14 volts under all conditions. Check power cables and connectors, visually, physically, and electrically. Bob, K4TAX Sent from my iPhone > On Dec 7, 2018, at 1:19 PM, Fred Jensen wrote: > > Is your power supply stable and at 14V? I had an Astron lose its regulation > becoming "wobbly" and down to about 11.5 V and the K3 audio sounded like it > had RF feedback. > > 73, > Fred ["Skip"] K6DGW > Sparks NV DM09dn > Washoe County > >> On 12/7/2018 11:02 AM, Dick Frey wrote: >> Okay, I need to be more specific about my "bad audio".. The audio is raspy, >> like it has rf in it. It is independent of frequency, power, mic type, >> recorded or not, Hi or Lo mic gain setting, and mic drive level. >> >> The only other issue I have is that the low power carrier is 5W when the >> PWR is set at 12W and jumps to 15W when PWR is set to 13W. It is 100W at >> the 100W setting. >> >> Perhaps the two issues are related. CW operation is unaffected. > > __ > 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 rmcg...@blomand.net __ 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] bad audio at K4XU
I suggest you use the K3 utility and run a full power calibration. This does require a known good 50 ohm dummy load. If the problem persists, then I suspect failure of the LPA and/or the KPA3 stages. Contact Elecraft support. Bob, K4TAX Sent from my iPhone > On Dec 7, 2018, at 1:02 PM, Dick Frey wrote: > > Okay, I need to be more specific about my "bad audio".. The audio is raspy, > like it has rf in it. It is independent of frequency, power, mic type, > recorded or not, Hi or Lo mic gain setting, and mic drive level. > > The only other issue I have is that the low power carrier is 5W when the > PWR is set at 12W and jumps to 15W when PWR is set to 13W. It is 100W at > the 100W setting. > > Perhaps the two issues are related. CW operation is unaffected. > -- > Dick - K4XU > __ > 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 rmcg...@blomand.net > __ 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] bad audio at K4XU
Is your power supply stable and at 14V? I had an Astron lose its regulation becoming "wobbly" and down to about 11.5 V and the K3 audio sounded like it had RF feedback. 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County On 12/7/2018 11:02 AM, Dick Frey wrote: Okay, I need to be more specific about my "bad audio".. The audio is raspy, like it has rf in it. It is independent of frequency, power, mic type, recorded or not, Hi or Lo mic gain setting, and mic drive level. The only other issue I have is that the low power carrier is 5W when the PWR is set at 12W and jumps to 15W when PWR is set to 13W. It is 100W at the 100W setting. Perhaps the two issues are related. CW operation is unaffected. __ 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] bad audio at K4XU
Hi Dick, I had the same problem when my power supply voltage was too low (12 volts with no load). 73 Frank W3LPL - Original Message - From: "Dick Frey" To: "Elecraft list" Sent: Friday, December 7, 2018 7:02:54 PM Subject: Re: [Elecraft] bad audio at K4XU Okay, I need to be more specific about my "bad audio".. The audio is raspy, like it has rf in it. It is independent of frequency, power, mic type, recorded or not, Hi or Lo mic gain setting, and mic drive level. The only other issue I have is that the low power carrier is 5W when the PWR is set at 12W and jumps to 15W when PWR is set to 13W. It is 100W at the 100W setting. Perhaps the two issues are related. CW operation is unaffected. -- Dick - K4XU __ 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 donov...@starpower.net __ 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] bad audio at K4XU
Okay, I need to be more specific about my "bad audio".. The audio is raspy, like it has rf in it. It is independent of frequency, power, mic type, recorded or not, Hi or Lo mic gain setting, and mic drive level. The only other issue I have is that the low power carrier is 5W when the PWR is set at 12W and jumps to 15W when PWR is set to 13W. It is 100W at the 100W setting. Perhaps the two issues are related. CW operation is unaffected. -- Dick - K4XU __ 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] bad audio
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: 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] bad audio
-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: 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] bad audio
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: 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
