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

[Fuqua, Bill L]

A few extra comments. this was in the early 70s and I had recently had a class in
information theory, which involved modulation and RF techniques. Today informantion 
theory classes mostly are about digital and little about radio technology.
  Another  hint is in the specifications in the manual.
73
Bill wa4lacv

________________________________________
From: test-equipment-bounces at mailman.qth.net [test-equipment-bounces at mailman.qth.net] On Behalf Of Fuqua, Bill L [wlfuqu00 at uky.edu]
Sent: Monday, December 12, 2011 12:39 PM
To: Test-Equipment at mailman.qth.net
Subject: [Test-Equipment] SSB on GR 1001a signal generator

   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
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