Hi Skip, Thanks, we have arrived at the point I wanted to get to,
So lets go a little further on this path, suppose I changed the tones in a not so random fashion. Like I had a way to generate tones as I do when I speak or make music or like some of those synthesizers or whatever they are, do not know the details exactly, but they generate tones that make up language that it understandable, with training would that be spread spectrum? You say varying the tones is the same as varying the VFO to the outside world, is that science? Would it make a difference if feed the balance modulator with 100 Hz or 2500 Hz. lets switch between to tunes, teletype, is that SS? If I produce speech it is speech if the tones do not form speech, it is ss modulation? Are you seeing that SSB is SS? as A kid I use to build oscillators I could speak to them, and they would swing, and could hear speach in a radio, unstability or FM , SS? Lets get to the core is WSJT spread spectrum and please explain to me why. I just do not seem to get it... Explain me the physics of it. please I just like to understand this. 73 Rein W6SZ -----Original Message----- >From: KH6TY <kh...@comcast.net> >Sent: Mar 9, 2010 7:04 PM >To: digitalradio@yahoogroups.com >Subject: Re: [digitalradio] Re: Question for experts > >I can't fathom the reason for doing that, but if the tone frequencies >are pseudo-randomly generated and then modulated by either on/off keying >or some other way, you will have a spread spectrum system, similar to >what is done in the ROS 2200 Hz-wide modes. The tones in a ssb >transmitter simply generate rf carriers, so varying the tone frequencies >is no different than varying a vfo frequency as far as the outside world >sees. The distinction in spread spectrum is the generation of the tone >frequencies independently of the data. I.e., you first generate a tone >frequency in a psudo-random manner and then convey intelligence by >modulating the resulting rf carriers. > >73 - Skip KH6TY > > > > >Ralph Mowery wrote: >> >> >> >> Correct but you still have not answered my question. Indeed If I >> use one tone and key it on / off I have a cw transmitter, transmitting >> on the VJO frequebcy = or - the audio frequency. >> >> What do I have if I just change the tones in a random fashion? >> >> 73 Rein W6SZ >> >> If a total random fashion, then you have a bunch of junk. It will >> not convey any useful information and probably illeagle in the ham bands. >> >> There must be order to it to convey any useful information. >> >>
