Sherwood Engineering also makes an interface kit for the FS-4, see
http://www.sherweng.com/ham.html#fs-4
What you are seeing is normal. The capacitance of the coax from the
FS-4 will change the frequencies of the band xtals. Have to unplug FS-4
from R-4B to correct or can build this adapter, see attached. If you are
only going to use FS-4 with R-4B, then just the toroid transformer may
be used.
73,
Paul, W5NTQ
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