True, Leigh... But you'll still have an upper or lower sideband after adding or subtracting the L.O.. I got tripped up in that one myself until someone pointed it out to me.
I haven't taken the time to dig around in the old QST archives, but in the early days of SSB (around 1950) there was *no* 40 meter phone band. Forty was 300 kc/s of CW and no broadcasters (Heaven with a key!!). I'm sort of curious to see if someone built an SSB exciter that tuned 5.0 to 5.3 MHz and mixed it with a 9 MHz oscillator to put a signal into either the 70 or 20 meter "phone" bands. Now that would produce USB on one band and LSB on the other that might have started the "convention". If not, it'd be interesting if someone could figure out just when the convention of using USB above 40 meters started. Ron AC7AC -----Original Message----- Leigh wrote: As I read it, the USB signal was generated at 455Kc and then mixed up to 9Mc, thus giving a USB 9Mc signal. The VFO was then in thr 4.0-5.3Mc range. And that was added or subtracted... _______________________________________________ Elecraft mailing list Post to: [email protected] http://mailman.qth.net/mailman/listinfo/elecraft You must subscribe to post. Subscriber Info (Addr. Change, Unsub etc): http://mailman.qth.net/subscribers.htm Elecraft page: http://www.elecraft.com
