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starman wrote in :
Due to the nature (physics) of how SSB works it's difficult to make the audio sound like the original. One problem is the original pitch range is missing from an SSB signal and there's no way to know exactly what it was. For example, I have heard Art Bell, the AM radio talk show host, operating on the ham' bands in SSB. It sounds like Art but it's not the same as hearing him on an AM broadcast station. It does help if there is musical content to an SSB signal which can act as a reference for adjusting the pitch correctly. Since SSB is mostly used for voice only, it doesn't really matter if the pitch is not exactly like the original. Thanks for the info. I was, after some practice, able to get the station to sound pretty good. It's kinda weird how you can change the pitch of the voice or music by changing the tuning. All this time I was convinced that the ssb on my radio didn't work right, especially since it's one of the selling points for this model. Guess I'm still a little wet behind the ears. |
The thing that is missing in SSB is the carrier -- it was suppressed. And
unlike AM only one side band is transmitted -- either the upper sideband (USB) or the lower sideband (LSB). Only one sideband is needed to transmit intelligence. Thus Single SideBand Suppressed carrier is the whole name for SSB transmissions. At the receiver side you reinsert a carrier (BFO) which then allows demodulation. As you tune the receiver, the BFO is inserted at different points until it sound natural. A little practice and you can tune right in on it. Hams do it all the time. SSB modulation is nicely illustrated at URL: http://www.williamson-labs.com/480_ssb.htm It explains the big advantages of using SSB along with pictorials -- Caveat Lector "Scott A." wrote in message ... starman wrote in : Due to the nature (physics) of how SSB works it's difficult to make the audio sound like the original. One problem is the original pitch range is missing from an SSB signal and there's no way to know exactly what it was. For example, I have heard Art Bell, the AM radio talk show host, operating on the ham' bands in SSB. It sounds like Art but it's not the same as hearing him on an AM broadcast station. It does help if there is musical content to an SSB signal which can act as a reference for adjusting the pitch correctly. Since SSB is mostly used for voice only, it doesn't really matter if the pitch is not exactly like the original. Thanks for the info. I was, after some practice, able to get the station to sound pretty good. It's kinda weird how you can change the pitch of the voice or music by changing the tuning. All this time I was convinced that the ssb on my radio didn't work right, especially since it's one of the selling points for this model. Guess I'm still a little wet behind the ears. |
Nothing weird about it. Just like any other radio signal, you have to tune
the radio correctly. "Scott A." wrote in message ... It's kinda weird how you can change the pitch of the voice or music by changing the tuning. |
"CW" ) writes: Nothing weird about it. Just like any other radio signal, you have to tune the radio correctly. But when people don't understand SSB, of course it's "weird". Tune a regular AM signal, and the carrier ensures that it is always tuned properly. The only thing the tuning does is move the signal into the passband of the IF filter. Mistune it, and you get reduced amplitude, and altered frequency response. With an SSB signal, mistuning likewise moves the signal out of the passband. But it also has to be tuned properly in relationship to the "reinserted carrier", ie the BFO, and if that isn't right, then you will be translating the modulation to the wrong place in the audio spectrum. Voice can be ambiguous, since you often won't know how someone sounds (because you don't know their voice), so mistuning can merely make someone sound squeaky, or even sound right even if not exactly as the person sounds in real life. Music is absolute tones, and if you don't tuen that right, not only will you not hear the proper notes, but the relationship of the notes to each other is off. You know what a given note sounds like, and not much mistuning messes things up. Michael "Scott A." wrote in message ... It's kinda weird how you can change the pitch of the voice or music by changing the tuning. |
"Scott A." wrote:
Thanks for the info. I was, after some practice, able to get the station to sound pretty good. It's kinda weird how you can change the pitch of the voice or music by changing the tuning. All this time I was convinced that the ssb on my radio didn't work right, especially since it's one of the selling points for this model. Guess I'm still a little wet behind the ears. I imagine other newbies might also come to the conclusion that their radio was defective when trying to listen to SSB transmissions, so your post could be quite helpful. ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
He is not complaining about picking the signal up but making it
understandable. You can't do this with DX-398. No SSB mode or BFO means no SSB detection. My 398 does it just fine. (????) jt |
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