I think most of the modern rice boxes are actually full double sideband. By modern, I mean in the last 5 years.
I have not seen any lately that or not full double SB, but I am sure there are still a few that use the filter and are SSB with carrier insertion regardless of mode. Actually TV is a mix mode thing. The first 250KHZ of modulation is full AM DoubleSB but then the rest of the 4.1 MH of modulation is SSB. At 3.58MHZ is the suppressed color subcarrier (not transmitted except in bursts)with double Sideband I/Q addition out to 500KC above and below the 3.58MHZ mark then another 500KC upper but only at the phase that produces skin tone. At 4.5MHZ out is the full FM audio subcarrier that is 150KHZ wide Interestingly the IF bandpass of the TV RCVR is a bell or flat top shape with the main carrier tuned at 50% down on one slope and the 4.5MHZ audio subcarrier in a trap right before after the sound IF takeoff. John, WA5BXO -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bob Macklin Sent: Thursday, February 07, 2008 5:39 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] Re: Carrier with one sideband The method of generating AM with a SSB transmitter by reinserting carrier was a common mode of operation in the late 50's and early 60's. The TV video signal works this way. It is my understanding the modern RICEBOXES that generate AM do it in the exact way. ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
