Howdy! Roy,   
      
   Surpressed Carrier is the topic not "Upper", "Lower" or   
   "Double Sideband".   
      
   I could run all three of those Modes on a Central Electronics 100V,   
   With Full Carrier or With Surpressed Carrier that was at a Ham Shack   
   when I was in the Navy at Naval Air Station Alameda, California.   
      
   I wish I had a CE 100V because IT IS THE BEST XTMR I've ever used.   
      
   I REALLY LOVED using the 100V and the companion 600L RF Amplifier when   
   I was there in the early 1960's.   
      
   I have a TS-520S, IIRC the Switches on the Front Panel are the same   
   as the Switches on the TS-520 that You use.   
      
   On one side of my QTH I have an 20 Meter Inverted V Antenna (IV) that   
   I used to use with the TS-520S before my Wife had me remove the Coax   
   and Antenna Rotor cables I had running from the Ham Shack in the   
   Basement, upstairs and through the Attic stairway and out the Gable   
   Ventilator on that side of the house to the 20M IV.   
      
   The center insulator of the antenna is just under the peak of a Gable   
   Roof and is Tied with some Twine to a nail I drove in just above the   
   Gabel Ventilator on that side of the house, and tied a string from it   
   to the 20M IV's Center Insulator.   
      
   The Coax Center Conductor is connected at the side of the Center   
   Insulator to the Leg of the antenna that goes toward the Back of   
   the house.   
   I have a Egg Insulator at the end of that side of the IV and tied some   
   Twine to fasten that Leg to a antenna Mast in the back yard that a   
   2M Beam and 2M JPole is mounted at the top of it.   
      
   At the end of the other antenna Leg that's connected to the Coax's   
   Shield I have a Egg Insulator that I tied some Twine to fasten it to   
   the 4 foot Chain Link Fence at the Front Side of my house.   
      
   I didn't want the HOT Leg of the 20M IV ending at the front side of my   
   QTH where someone might touch it.   
      
   Safety is why I connected the Coax that way.   
      
                            ***C A U T I O N***   
   ***DO NOT TRY WHAT I TYPE NEXT  ***  THIS IS ONLY A COMMENT***   
                            ***C A U T I O N***   
      
   Lets say I Connect my 20M IV antenna to the TS-520S.   
      
   Set the Band Switch to 14.   
      
   Set the Main Tuning Knob to a frequency in a portion of the 20 Meter   
   Amateur Radio Phone Band that I can use my Advanced Class Operators   
   License on.   
      
   Tune the Radio up as it says in the Operating Manual, in Section 4   
   titled "Operating Instructions".   
      
   Connect the Microphone.   
      
   Set the Mode Switch to USB.   
      
   Set the VOX Switch to MAN.   
      
   Set the Standby Switch to SEND to Key Up the XMTR.   
      
   And Flip the PTT Rocker Switch on my Electro-Voice 729SR Microphone to   
   the TRANSMIT position.   
      
   Walk out to the back yard and touch the 20M IV antenna wire with my   
   bare hand where it connects to the Egg Insulator.   
      
   On the Antenna Leg that the Center Conductor of the coax is connected   
   to up at the Center Insulator of the 20M IV, The Radio Amateur's   
   Handbook says the RF Voltage is at Maximum,   
   and the RF Current is "nearly zero" at that point where the Egg   
   Insulator is at in my back yard.   
      
   I truly believe I would get a RF BURN with no noise in the Ham Shack   
   where the Radio and Microphone is located that could put/add Modulation   
   to the USB 20M RF Surpressed Carrier Signal.   
      
   If I wanted to be really stupid, I would ask another Ham to bring their   
   One Kilowatt RF Amplifier and connect that between the TS-520S and the   
   20M IV Antenna.   
      
   I am sure that would LIGHT UP MY LIFE or Extinguish it.   
      
      
                            ***C A U T I O N***   
   ***DO NOT TRY WHAT I TYPED ABOVE  ***  THIS WAS ONLY A COMMENT***   
                            ***C A U T I O N***   
      
   I may have been a little bit lax in the details and missed a setting   
   or so.   
      
   But do You still think there is NOTHING (RF Voltage or RF Current) at   
   the Driven Leg of the 20M IV when the microphone doesn't have any audio   
   going into it?   
      
      
      
   ... Running madly into the wind and screaming ...   
   --- MultiMail/MS-DOS v0.49   
   --- SBBSecho 2.12-Linux   
    * Origin: telnet & http://cco.ath.cx - Dial-Up: 502-875-8938 (1:2320/105.1)