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Hi Jim
The R-4C makes a very fine CW receiver but in its standard form and without
a CW filter it is lacklustre. An Inrad 500Hz filter will make a
significant improvement to selectivity. The GUF-1 will add nothing
worthwhile for CW and in my own opinion doesn't add too much to SSB use
either. I put a GUF-1/8kHz in my R-4C here and frankly found the
difference a little disappointing. That said, I'm not much of a phone
operator and if I were, perhaps I might find greater utility in it.
If you really want to sharpen up skirt selectivity for CW use, the way to
go is with a Sherwood CF-600/6. This filter is inserted in the first i/f
and uses TO5 can relays for switching. I have one of these installed in my
current R-4C as I did in my previous R-4C which I owned 25 years ago. It
is excellent and for a serious CW man, it's worth every cent.
Installation is quite straight forward for someone competent with a
soldering iron.
Unfortunately the stock R-4C is a bit grungy in the audio department.
It makes sense to replace the audio output stage with a modern IC amp.
Sherwood does offer a kit for this too, though I think there may be others
available too. Take a look at the mods offered by Rob Sherwood at www.sherweng.com My own relationship with Rob
extends no further than being a very satisfied user of his products
for over 25 years.
Good luck.
73
Bob, 5B4AGN
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