"Keyboard In The Wilderness" wrote in message
news:lAU7d.41233$aW5.23119@fed1read07...
May have -- but there is a very common broadcast mode that uses DSB
suppressed carrier



Number stations sometimes use this mode.

--
Simon Mason
Anlaby
East Yorkshire.
53°44'N 0°26'W
http://www.simonmason.karoo.net