>
> > The r4c is a terrific receiver IF it has the sherwood 600
> > hz roofing filter(still available from Bob Sherwood I think),
> > and/or the GUF-1 filter (still available from International
> > radio) and certain other mods dependant on serial number.
>
> The GUF1 won't help the R4C a bit for CW. It is too wide. It
> barely makes a difference on SSB. IMO the GUF1 is not worth
> bothering with.
The GUF-1 was an 8 Pole - 6 KHz filter and provided a useful
improvement on SSB without resorting to separate USB/LSB filters
in the R4C first IF.
FoxTango (the predecessor of International Radio Service Division
and INRAD) produced a GUF-2 that was an 6 pole 600 Hz PC board
mounted filter with relays for switching between filters. As
expected, the GUF-2 provided the same performance improvement as
the Sherwood 600 Hz filter.
Unfortunately, I do not believe that George has kept the GUF-2 in
the product line at INRAD.
73,
... Joe, K4IK
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