How to set up SSB
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I've just gotten my MH2 working again with a RadioShack 270-090 element. I
have no idea if that's the right part, but it appeared identical to the Heil part, and the o'scope says about 120 mV p-p when I talk normally (Measured at pin 5 of the SSB adapter - should be the same as mic connectory pin 1). Anyhow, I sold my "other" rig years ago as the K2 was all I appeared to need. I'm wondering how to deal with on-air reports of "horrible audio, almost unreadable" without hearing what I sound like. Ideas: a) Borrow an SSB rig and fix my K2. b) Try stuff randomly on the air and hope the other ops give consistent info. I'm not sure how much trouble a) would be, but it's most likely the best way. I wonder what the shipping would be to borrow an "extra" rig from someone? Any "spares" out there? b) should work, but I have SSBA-1, SSBA-2, SSBC 1:1, SSBC 2:1, SSBC 3:1, SSBC 4:1, the VFO (how to tune someone whose voice you don't know) and of course, the BFO. Varying all of these in an organized way is going to take another receiver or someone VERY patient on the other end of the aether. Ideas? Hey, anyone know of an Internet receiver I can listen through? That might work. Only thing I could find in the archives is http://www.smeter.net/ and it's off the air. Dan / WG4S / K2 #2456 _______________________________________________ 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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Hi Dan.
> Ideas? How about whipping up a cheap and dirty crystal controlled direct conversion receiver? Set your transceiver to the receiver's crystal frequency (which you will be able to zero-beat to with your transceiver) and perform your SSB tests. Lots of cheap microprocessor surplus crystals fall within HF ham bands, making this an easy solution. The beauty of this approach is that the direct conversion receiver contains no filtering or AGC (at least if you build it that way), and will give you an extremely honest on-air audio sample. You won't need much in the way of receiver gain, either. > Hey, anyone know of an Internet receiver I can listen through? That might > work. Only thing I could find in the archives is http://www.smeter.net/ and > it's off the air. http://www.ralabs.com/webradio/ 73, de John, KD2BD ===== Visit John on the Web at: http://www.qsl.net/kd2bd/ __________________________________ Do you Yahoo!? Check out the new Yahoo! Front Page. www.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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In reply to this post by Dan Barker
Dan,
You could try using the microphone direct into a tape recorder if the mic's response is the primary question. If you are referring to filter adjustments to match your voice, I think more emphasis than necessary has been placed on refining the frequency range. If you have set your FL1 BFO so that the lower frequency -3dB corner of the SSB passband is at 300 Hz, you will be presenting the best frequency response for communications use. Some exceptions do occur, but that is not the norm. OTOH, if you have questions about overloading and clipping and the effects of compression on the fidelity of your voice or evaluating the response of that particular microphone with the K2, listening on a separate receiver is the best way to answer those questions. Of course, you can trust to another ham who knows your normal voice and has a receiver adequate to evaluate the signal - be certain that you are not overloading the receiver if that person is a local. As has been mentioned in a prior post, a simple DC receiver can be used to tell you what your signal sounds like. DC receivers have all filtering done at audio, and have potential to provide the best fidelity. 73, Don W3FPR ----- Original Message ----- > I've just gotten my MH2 working again with a RadioShack 270-090 element. I > have no idea if that's the right part, but it appeared identical to the > Heil > part, and the o'scope says about 120 mV p-p when I talk normally (Measured > at pin 5 of the SSB adapter - should be the same as mic connectory pin 1). > > Anyhow, I sold my "other" rig years ago as the K2 was all I appeared to > need. I'm wondering how to deal with on-air reports of "horrible audio, > almost unreadable" without hearing what I sound like. > > Ideas: > a) Borrow an SSB rig and fix my K2. > b) Try stuff randomly on the air and hope the other ops give consistent > info. > > I'm not sure how much trouble a) would be, but it's most likely the best > way. I wonder what the shipping would be to borrow an "extra" rig from > someone? Any "spares" out there? > > b) should work, but I have SSBA-1, SSBA-2, SSBC 1:1, SSBC 2:1, SSBC 3:1, > SSBC 4:1, the VFO (how to tune someone whose voice you don't know) and of > course, the BFO. > > Varying all of these in an organized way is going to take another receiver > or someone VERY patient on the other end of the aether. > > Ideas? > > Hey, anyone know of an Internet receiver I can listen through? That might > work. Only thing I could find in the archives is http://www.smeter.net/ > and > it's off the air. > > Dan / WG4S / K2 #2456 > > > _______________________________________________ > 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 > _______________________________________________ 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 Dan Barker
Greetings
I have just finished installing the KSB2 into my K2 sn 3029. Both the KSB2 and the MH2 were recently bought. I downloaded both Don's, W3FPR, and Tom's, N0SS, notes for alignment using Spectrogram. Don suggests the lower roll off corner at 300Hz and Tom's plots show it at 500Hz. I set the filter up with the corner at 300Hz but on air tests with another ham to listen on a second transceiver while the K2 transmitted into a dummy load as suggested in the kit manual gave a very muffled sound. After experimentation using ear only the reset filters were remeasured with Spectrogram and showed the lower corner at about 500hz. Some on air qsos still suggest that the signal still has too much bass. It seems you do need to experiment like the manual suggests. 73s, Nigel ZL2DF ------------------------------ Message: 36 Date: Thu, 11 Nov 2004 21:50:22 -0500 From: "W3FPR - Don Wilhelm" <[hidden email]> Subject: Re: [Elecraft] How to set up SSB To: "Dan Barker" <[hidden email]>, "Elecraft" <[hidden email]> Message-ID: <00fd01c4c863$08c98ac0$0400a8c0@w3fprmain> Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Dan, You could try using the microphone direct into a tape recorder if the mic's response is the primary question. If you are referring to filter adjustments to match your voice, I think more emphasis than necessary has been placed on refining the frequency range. If you have set your FL1 BFO so that the lower frequency -3dB corner of the SSB passband is at 300 Hz, you will be presenting the best frequency response for communications use. Some exceptions do occur, but that is not the norm. OTOH, if you have questions about overloading and clipping and the effects of compression on the fidelity of your voice or evaluating the response of that particular microphone with the K2, listening on a separate receiver is the best way to answer those questions. Of course, you can trust to another ham who knows your normal voice and has a receiver adequate to evaluate the signal - be certain that you are not overloading the receiver if that person is a local. As has been mentioned in a prior post, a simple DC receiver can be used to tell you what your signal sounds like. DC receivers have all filtering done at audio, and have potential to provide the best fidelity. 73, Don W3FPR ----- Original Message ----- > I've just gotten my MH2 working again with a RadioShack 270-090 > element. I have no idea if that's the right part, but it appeared > identical to the Heil part, and the o'scope says about 120 mV p-p when > I talk normally (Measured at pin 5 of the SSB adapter - should be the > same as mic connectory pin 1). > > Anyhow, I sold my "other" rig years ago as the K2 was all I appeared > to need. I'm wondering how to deal with on-air reports of "horrible > audio, almost unreadable" without hearing what I sound like. > > Ideas: > a) Borrow an SSB rig and fix my K2. > b) Try stuff randomly on the air and hope the other ops give > consistent info. > > I'm not sure how much trouble a) would be, but it's most likely the > best way. I wonder what the shipping would be to borrow an "extra" rig > from someone? Any "spares" out there? > > b) should work, but I have SSBA-1, SSBA-2, SSBC 1:1, SSBC 2:1, SSBC > 3:1, SSBC 4:1, the VFO (how to tune someone whose voice you don't > know) and of course, the BFO. > > Varying all of these in an organized way is going to take another > receiver or someone VERY patient on the other end of the aether. > > Ideas? > > Hey, anyone know of an Internet receiver I can listen through? That > might work. Only thing I could find in the archives is > http://www.smeter.net/ and it's off the air. > > Dan / WG4S / K2 #2456 > > _______________________________________________ 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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Nigel and all,
I hope I have not caused any confusion, BUT ... I have been refering to the classical filter 'corner frequency' as the -3 dB point, which does place the upper 'physical corner' seen on the display at 400 to 500 Hz. Perhaps I should change my text to clarify. 73, Don W3FPR ----- Original Message ----- I have just finished installing the KSB2 into my K2 sn 3029. Both the KSB2 and the MH2 were recently bought. I downloaded both Don's, W3FPR, and Tom's, N0SS, notes for alignment using Spectrogram. Don suggests the lower roll off corner at 300Hz and Tom's plots show it at 500Hz. _______________________________________________ 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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Don and All,
I too was referring to the -3db to -6db point down from the top of the passband level (the scale and extraneous ripple makes it hard to be accurate. After initially setting the filter -3db to -6db at 300Hz the on air adjustment moved the filter to -3db to -6db down at 500Hz, more like Tom's plot. For my set and my voice setting the markers at 500 and 2700 produced a better sounding signal. I made the comment to the reflector because I wondered if this might have also been the experience of the original query and to flag that I had to move my filter 200Hz as is suggested in the assembly manual. Excellent information comes out of this reflector on a whole range of subjects. I think you, Don, are very patient with all the repetitive enquiries about filter alignment which come up and you quietly give your good advice and information from your well set up website. I enjoy your contributions. Warm Regards 73s, Nigel ZL2DF > -----Original Message----- > From: W3FPR - Don Wilhelm [mailto:[hidden email]] > Sent: Saturday, November 13, 2004 1:46 PM > To: [hidden email]; [hidden email] > Subject: Re: [Elecraft] How to set up SSB > > > Nigel and all, > > I hope I have not caused any confusion, BUT ... > I have been refering to the classical filter 'corner > frequency' as the -3 dB > point, which does place the upper 'physical corner' seen on > the display at > 400 to 500 Hz. Perhaps I should change my text to clarify. > > 73, > Don W3FPR > > ----- Original Message ----- > I have just finished installing the KSB2 into my K2 sn 3029. > Both the KSB2 > and the MH2 were recently bought. > I downloaded both Don's, W3FPR, and Tom's, N0SS, notes for > alignment using > Spectrogram. Don suggests the lower roll off corner at > 300Hz and Tom's > plots show it at 500Hz. > > > _______________________________________________ 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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