[ARC5] ARC-5 with Upper and Lower Sideband switch?

[Neil Barnett]

>From: "D C Macdonald" <k2gkk at hotmail.com>
>Subject: RE: [ARC5] ARC-5 with Upper and Lower Sideband switch?

> I'd say it would be pretty simple.  Position the BFO off
> center from the IF (say 1.5 kHz) then switch in (or out)
> a small capacitance that would put the BFO 1.5 kHz to
> the other side of IF center frequency.
> 
> As broad as the IF of a BC-455 is, I'd say that unwanted
> sideband rejection would be pretty poor, but it would
> be noticeable.


Hi,
Yes, that is what has probably been done. If so, that would
be one of the dumbest mods ever done, because the IF strip
in the ARC-5 is so wide that you would scarcely notice the
improvement.
Perhaps the guy connected the BC-455 to the output of a
tuneable converter which had a 9 MHz SSB filter in its
output.
He tunes the BC-455 to 9 MHz, and doesn't touch the dial
again, thus using it as a fixed-tuned IF strip for the converter.
All of the subsequent tuning is done on the converter dial.
In this case, a switchable BFO makes sense.

73 de Neil, ZL1ANM
in Auckland.