KSB2 sidetone?
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Even though I built and installed a KSB2 a year or so ago, this week
is the first time I've actually used it. I have to admit, phone operation is sort of fun, though I'm not likely to spend much time outside contests doing it - altogether too much like a telephone. One question: there doesn't seem to be any sidetone in the headset when I transmit. I made some recordings of my audio output (to play back for W7GH, who was also testing out his KSB2), and we both noticed that there is some ... murmuring when I'm transmitting, but nothing intelligible. I thought the lack of sidetone would be an issue, but it doesn't seem to be. Still, I'm curious - what's the murmuring? Should there be audible sidetone? 73 de chris K6DBG _______________________________________________ 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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Chris,
I cannot relate 'sidetone in the headset' with SSB operation. In CW, there is a sidetone presented to the headphones or speaker which follows the keying, but there is nothing of that sort for SSB. If you lost your CW sidetone while using the K2 memory, that is quite another matter. The K3 does provide a means of monitoring the transmitted audio (but that is not a sidetone), but the K2 does not - an external receiver with a short antenna while the K2 is operating into a dummy load can be used to listen to your transmitted audio. As far as the 'murmur', please try to be more descriptive - I can only guess that it might be either room noise pickup by the microphone or it could be incomplete carrier suppression or possibly some sort of RF Feedback due to 'RF in the shack'. If you have an oscilloscope or other means of detecting a low level RF signal, you can set the carrier balance pot with more precision than by using the method described in the manual. Do not connect a microphone but do connect a key or paddle - connect the 'scope or other detector across a dummy load. Then go to LSB mode and close the dot paddle or handkey and adjust the carrier balance pot for minimum carrier - switch to USB and check the carrier balance again - you may have to go back and forth between LSB and USB to obtain the lowest compromise setting for both sidebands. Properly adjusted, the K2 carrier balance is excellent. You may also want to re-check your OP1 passband setting using Spectrogram. It is important to place the low frequency corner (-3dB point) of the passband close to the 300 Hz point for both LSB and USB. If you have the stock 2.4 kHz SSB filter, set the Spectrogram markers at 300 and 2600 and center the passband between those markers and it will normally be correct for both transmit and receive. See the filter setting information in part 3 of my K2 dial calibration article on my website http://w3fpr.qrpradio.com for additional information about using Spectrogram for setting the SSB filters. 73, Don W3FPR Chris Kantarjiev wrote: > Even though I built and installed a KSB2 a year or so ago, this week > is the first time I've actually used it. I have to admit, phone > operation is sort of fun, though I'm not likely to spend much time > outside contests doing it - altogether too much like a telephone. > > One question: there doesn't seem to be any sidetone in the headset > when I transmit. I made some recordings of my audio output (to > play back for W7GH, who was also testing out his KSB2), and we > both noticed that there is some ... murmuring when I'm transmitting, > but nothing intelligible. > > I thought the lack of sidetone would be an issue, but it doesn't > seem to be. Still, I'm curious - what's the murmuring? Should there > be audible sidetone? > > 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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> I cannot relate 'sidetone in the headset' with SSB operation. In CW,
> there is a sidetone presented to the headphones or speaker which > follows the keying, but there is nothing of that sort for SSB. > The K3 does provide a means of monitoring the transmitted audio (but > that is not a sidetone) FWIW I'm a pilot and the transceivers we use in airplanes to communicate with the ground all have audio sidetone that feeds back into the headset. Your telephone has sidetone that feeds your voice back to the earpiece. In both cases this feature is called "sidetone". See http://en.wikipedia.org/wiki/Sidetone and http://www8.garmin.com/manuals/SL30Nav_Comm_UserGuide.pdf (page 32). Craig NZ0R _______________________________________________ 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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The reason for sidetone is that it makes talking much easier if you can hear
your own voice. Early telephones could easily be made to have no sidetone, but it was found that the user found it difficult to speak properly, so some of their voice was fed back just for this purpose. If you have tried speaking over the internet with a loudspeaker, you quickly build up several echoes as your sidetone and your respondent's sidetone build up, so, headphones are almost mandatory. If your headphones are for hi fi, they may have little attenuation of the surroundings, such as my Sennheiser, but communications headphones are usually made to keep out extraneous noise and that's when you need sidetone. It's up to 20dB down, but nice if this is adjustable to taste and local conditions. David G3UNA ----- Original Message ----- From: "Craig Rairdin" <[hidden email]> To: <[hidden email]> Sent: Monday, November 19, 2007 3:08 PM Subject: RE: [Elecraft] KSB2 sidetone? >> I cannot relate 'sidetone in the headset' with SSB operation. In CW, >> there is a sidetone presented to the headphones or speaker which >> follows the keying, but there is nothing of that sort for SSB. >> The K3 does provide a means of monitoring the transmitted audio (but >> that is not a sidetone) _______________________________________________ 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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Everybody has "sidetone". When you record your voice and play it back
you'll notice it doesn't sound the same as you hear yourself because you hear your speech returning through your skull bones. While wearing headphones you're hearing the "murmur" or "sidetone" if you will returning through your skull bones I've heard this "murmur" with every transceiver I've ever owned On Nov 19, 2007 9:31 AM, David Cutter <[hidden email]> wrote: > The reason for sidetone is that it makes talking much easier if you can hear > your own voice. Early telephones could easily be made to have no sidetone, > but it was found that the user found it difficult to speak properly, so some > of their voice was fed back just for this purpose. If you have tried > speaking over the internet with a loudspeaker, you quickly build up several > echoes as your sidetone and your respondent's sidetone build up, so, > headphones are almost mandatory. If your headphones are for hi fi, they may > have little attenuation of the surroundings, such as my Sennheiser, but > communications headphones are usually made to keep out extraneous noise and > that's when you need sidetone. It's up to 20dB down, but nice if this is > adjustable to taste and local conditions. > > David > G3UNA > > ----- Original Message ----- > From: "Craig Rairdin" <[hidden email]> > To: <[hidden email]> > Sent: Monday, November 19, 2007 3:08 PM > Subject: RE: [Elecraft] KSB2 sidetone? > > > >> I cannot relate 'sidetone in the headset' with SSB operation. In CW, > >> there is a sidetone presented to the headphones or speaker which > >> follows the keying, but there is nothing of that sort for SSB. > >> The K3 does provide a means of monitoring the transmitted audio (but > >> that is not a sidetone) > > > _______________________________________________ > 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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