SSB

[Martin Czech]

> 
> Nope - I built it all on two or three (can't exactly remember)
> vectorboards. But hey, that's a good idea! Maybe someday.... does anybody
> out there know what multiplier chips are readily available from Analog
> Devices these days? I suspect that some of them (AD532 etc.) are out of
> production or superceded by now, and that will affect the layout. It's been
> a while since I've talked to the Hamilton rep and I don't work at the job
> where the old contacts were anymore.

I tryed ad663 (or 633 ?), noisy as hell. And then I made my own multiplier
with discrete BC549C (matched out of 100). It needs some time to settle thermaly, but then
it's ok (they are thermally isolated, and mounted on a piece of aluminum.
I would recommend to modulate with square waves, it's easy to get 90deg shift,
and no log circuit is needed to compensate for distortion, a square is always
a square, even when distorted.
In this case two multipliers with 6 BC549C are needed to isolate the sidebands.
Another ringmod will shift the spectra wher you want.

m.c.