Topband: Receivers

[Joe Subich, K4IK]

> 
> > 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