[Elecraft] USB on all bands ??

[Ken Kopp]

It's been a LONG time now, but I think I can at least
give the basic idea of how lower and upper SSB on
individual bands came about.

Most of the early SSB rigs ... all HB, of course ... were
built around a BC-458 (?) "command set" TX who's VFO 
covered a range just above(?) 40M 

Some early store-bought rigs actually contained a BC-458 
inside the box ... Central Electronics comes to mind.

The SSB audio was generated via a carefully matched
set of low frequency ... below the BC band ... crystals that
were commonly available in large quantities.  This low
frequency SSB signal was mixed with the output of the
command set's VFO and a fixed-frequency oscillator
to produce SSB RF on what ever band was desired.

Since the VFO's range was limited, the mixer oscillator
had to be switched to be above or below the VFO's frequency.
This produced LSB on 160/80/40 and USB on 20/10. There
was no 15M at that time. 

I trust I'll be forgiven if I haven't explained this with great
accuracy, but you get the general idea ... (:-))

73! Ken Kopp - K0PP
       ElecraftCovers at rfwave.net