[Test-Equipment] SSB on GR 1001a signal generator

[Fuqua, Bill L]

   When I got my first spectrum analyzer working I noticed something odd.
I was using a GR1001A signal generator with internal modulation and noticed
that it had a carrier and only the upper sideband. 
   Since my  spectrum analyzer's basic IF  was 5 MHz and I did not have the
external local oscillator connected I had tuned the 1001A to 5 MHz on a the 
top of that band.
  I  figured something was wrong with the analyzer. But I realized if I switched to
the next band up where 5 MHz was at the bottom of the range it produced the 
signal that I had expected, carrier with upper and lower sidebands.
  It took me a while to figure out what was going on and once I analyzed the
circuit I it made sense. 
  Here is a trivia question for everyone. 
What happened to the lower sideband?
   By the way I noticed the same effect on more than one of these signal generators.

73
Bill wa4lav