SSB TX audio problem. Need help !
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SSB TX audio problem. Need help !
 
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Hi,
I have a K2 that work great since 2003, but this morning.... Nop. Nothing change on my setup, I was just operate my rig this morning as usual and found this morning that my SSB TX audio looks horrible... sounds like RF feedback a few hams told me..... but... I tried the K2 on a dummy load and listened up with my KX1, and I found that when I start to speak, the audio is like «scribble» or like a defective speaker that fuzz. It seems to be worst at the beginning of the transmission. I have only 1 bar or 2 on ALC reading. It sounds like overdriven, but ALC reading on the bar graph seems OK. I also remove every options and installed my un-mod kit to replace options. I'm running the basic K2 with only the SSB adapter... nothing else. I did again the SSB calibration procedure, nothing at all, everything is OK on this side. I tried every audio gain and compressor combination, the problem still there, not worse, not better. Does somebody have something to suggest me to start with ??? This is my first real problem from the beginning, so I don't have much experience in finding problem. I have a scope, but with not much experience on how to test... Thanks for your help !! J-F VA2VYZ __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ 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 |
RE: SSB TX audio problem. Need help !
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Jean-Francois,
Can you check your microphone? That sounds a lot like a bad mic element to me. Try another mic if you can - if you are wired for the electret mic (with the resistor), then you can even use one of the inexpensive computer mics. In any case, substantiating that the mic is good is the first step in troubleshooting a problem like you described. As an alternative you could feed known clean audio into your K2 from an audio generator, or even make up a voltage divider and feed audio from the computer soundcard or a portable CD Player into the K2 (just don't transmit on the air). Using a controlled audio source will allow you to troubleshoot a problem inside your K2 with your 'scope much easier than trying to do it live with a microphone. If you do not know how to build up the voltage divider required, take a look at some of the PSK31 'how-to' websites for the simple interface schematics - you need only the soundcard output half of the interface. 73, Don W3FPR > -----Original Message----- > > I have a K2 that work great since 2003, but this morning.... Nop. > > Nothing change on my setup, I was just operate my rig this morning as > usual and found this morning that my SSB TX audio looks horrible... > sounds like RF feedback a few hams told me..... but... > > I tried the K2 on a dummy load and listened up with my KX1, and I found > that when I start to speak, the audio is like «scribble» or like a > defective speaker that fuzz. It seems to be worst at the beginning of > the transmission. I have only 1 bar or 2 on ALC reading. It sounds like > overdriven, but ALC reading on the bar graph seems OK. > > I also remove every options and installed my un-mod kit to replace > options. I'm running the basic K2 with only the SSB adapter... > nothing else. > > I did again the SSB calibration procedure, nothing at all, everything is > OK on this side. > > I tried every audio gain and compressor combination, the problem still > there, not worse, not better. > > Does somebody have something to suggest me to start with ??? This is my > first real problem from the beginning, so I don't have much experience > in finding problem. > > I have a scope, but with not much experience on how to test... > > Thanks for your help !! > > J-F VA2VYZ > No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.15.15/580 - Release Date: 12/8/2006 12:53 PM _______________________________________________ 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 |
Re: SSB TX audio problem. Need help !
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A very strange way to solve my problem was to «hard reset» the K2. And
setting up from scratch with all needed values. This is the second time that I solved a problem with a «hard reset». The first time, a friend of mine brought me his K2 because he had TX problem in CW. His problem was like he was transmitting 7-8 kHz wide in CW. All BFO and filters values were OK, but after a «hard reset», I set again all values and everything was working fine. I got another strange problem here with mine this time. On TX SSB, people received me like I had RF feed back. I recorded my audio myself with my computer, and yes I have ripple in my TX.... even with different microphone, and at 5W in a dummy load. A reset cure the problem, or at least, since the reset, I did not have the problem anymore. I connected my PC audio to my K2 mic with an adapter using an interface between them and transmitted in a dummy load a few MP3 over the air. The received signal on my KX1 seems to be all OK now. Now glitch or ripple. It seems to me that some values written in the EPROM was corrupt, or at least, not good... Does anybody got the problem before ? Don Wilhelm a écrit : > Jean-Francois, > > Can you check your microphone? That sounds a lot like a bad mic element to > me. Try another mic if you can - if you are wired for the electret mic > (with the resistor), then you can even use one of the inexpensive computer > mics. > > In any case, substantiating that the mic is good is the first step in > troubleshooting a problem like you described. > > As an alternative you could feed known clean audio into your K2 from an > audio generator, or even make up a voltage divider and feed audio from the > computer soundcard or a portable CD Player into the K2 (just don't transmit > on the air). Using a controlled audio source will allow you to troubleshoot > a problem inside your K2 with your 'scope much easier than trying to do it > live with a microphone. > > If you do not know how to build up the voltage divider required, take a look > at some of the PSK31 'how-to' websites for the simple interface schematics - > you need only the soundcard output half of the interface. > > 73, > Don W3FPR > > >> -----Original Message----- >> >> I have a K2 that work great since 2003, but this morning.... Nop. >> >> Nothing change on my setup, I was just operate my rig this morning as >> usual and found this morning that my SSB TX audio looks horrible... >> sounds like RF feedback a few hams told me..... but... >> >> I tried the K2 on a dummy load and listened up with my KX1, and I found >> that when I start to speak, the audio is like «scribble» or like a >> defective speaker that fuzz. It seems to be worst at the beginning of >> the transmission. I have only 1 bar or 2 on ALC reading. It sounds like >> overdriven, but ALC reading on the bar graph seems OK. >> >> I also remove every options and installed my un-mod kit to replace >> options. I'm running the basic K2 with only the SSB adapter... >> nothing else. >> >> I did again the SSB calibration procedure, nothing at all, everything is >> OK on this side. >> >> I tried every audio gain and compressor combination, the problem still >> there, not worse, not better. >> >> Does somebody have something to suggest me to start with ??? This is my >> first real problem from the beginning, so I don't have much experience >> in finding problem. >> >> I have a scope, but with not much experience on how to test... >> >> Thanks for your help !! >> >> J-F VA2VYZ >> >> > -- > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.5.432 / Virus Database: 268.15.15/580 - Release Date: 12/8/2006 > 12:53 PM > > > Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ 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 |
Re: SSB TX audio problem. Need help !
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I forgot to say that eveything was OK in CW... The problem was only in SSB.
73 Jean-François Ménard a écrit : > A very strange way to solve my problem was to «hard reset» the K2. And > setting up from scratch with all needed values. > > This is the second time that I solved a problem with a «hard reset». > The first time, a friend of mine brought me his K2 because he had TX > problem in CW. His problem was like he was transmitting 7-8 kHz wide > in CW. All BFO and filters values were OK, but after a «hard reset», I > set again all values and everything was working fine. > > I got another strange problem here with mine this time. On TX SSB, > people received me like I had RF feed back. I recorded my audio myself > with my computer, and yes I have ripple in my TX.... even with > different microphone, and at 5W in a dummy load. > > A reset cure the problem, or at least, since the reset, I did not have > the problem anymore. I connected my PC audio to my K2 mic with an > adapter using an interface between them and transmitted in a dummy > load a few MP3 over the air. The received signal on my KX1 seems to be > all OK now. Now glitch or ripple. > > It seems to me that some values written in the EPROM was corrupt, or > at least, not good... > > Does anybody got the problem before ? > > > > > Don Wilhelm a écrit : >> Jean-Francois, >> >> Can you check your microphone? That sounds a lot like a bad mic >> element to >> me. Try another mic if you can - if you are wired for the electret mic >> (with the resistor), then you can even use one of the inexpensive >> computer >> mics. >> >> In any case, substantiating that the mic is good is the first step in >> troubleshooting a problem like you described. >> >> As an alternative you could feed known clean audio into your K2 from an >> audio generator, or even make up a voltage divider and feed audio >> from the >> computer soundcard or a portable CD Player into the K2 (just don't >> transmit >> on the air). Using a controlled audio source will allow you to >> troubleshoot >> a problem inside your K2 with your 'scope much easier than trying to >> do it >> live with a microphone. >> >> If you do not know how to build up the voltage divider required, take >> a look >> at some of the PSK31 'how-to' websites for the simple interface >> schematics - >> you need only the soundcard output half of the interface. >> >> 73, >> Don W3FPR >> >> >>> -----Original Message----- >>> >>> I have a K2 that work great since 2003, but this morning.... Nop. >>> >>> Nothing change on my setup, I was just operate my rig this morning as >>> usual and found this morning that my SSB TX audio looks horrible... >>> sounds like RF feedback a few hams told me..... but... >>> >>> I tried the K2 on a dummy load and listened up with my KX1, and I found >>> that when I start to speak, the audio is like «scribble» or like a >>> defective speaker that fuzz. It seems to be worst at the beginning of >>> the transmission. I have only 1 bar or 2 on ALC reading. It sounds like >>> overdriven, but ALC reading on the bar graph seems OK. >>> >>> I also remove every options and installed my un-mod kit to replace >>> options. I'm running the basic K2 with only the SSB adapter... >>> nothing else. >>> >>> I did again the SSB calibration procedure, nothing at all, >>> everything is >>> OK on this side. >>> >>> I tried every audio gain and compressor combination, the problem still >>> there, not worse, not better. >>> >>> Does somebody have something to suggest me to start with ??? This is my >>> first real problem from the beginning, so I don't have much experience >>> in finding problem. >>> >>> I have a scope, but with not much experience on how to test... >>> >>> Thanks for your help !! >>> >>> J-F VA2VYZ >>> >>> >> -- >> No virus found in this outgoing message. >> Checked by AVG Free Edition. >> Version: 7.5.432 / Virus Database: 268.15.15/580 - Release Date: >> 12/8/2006 >> 12:53 PM >> >> >> > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com _______________________________________________ > 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 > Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ 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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