[Elecraft] Elecraft technology

[Don Wilhelm]

OK Folks,

Jim's math is correct - I spoke incorrectly.
I guess I was remembering the Central Electronics 10B exciter - which did
have a 9 MHz SSB generator.  I never used one but heard many comments from
those who did about problems remembering whether SB-1 or SB-2 (that was the
way the panel was marked) was USB or LSB for one band or another.  So this
did NOT invert the sideband between 75 and 20.

73,
Don W3FPR


----- Original Message -----

I used to think so. But then I did the math.

For sideband inversion to occur in a mixer, the LO frequency must be higher
than *both* the signal input and output frequencies. Otherwise the sideband
does not invert. The K2 uses this to advantage, as did many ham rigs of the
past. But not those with a 9 MHz SSB generator and 5-5.5 MHz VFO. In those
rigs, the direction of tuning inverts but not the sideband.