Thanks to everyone who responded. As many suggested, I tried substituting
first a barrel connector, then a short piece of coax, for the SB-220. With
the SB-220 in line, minimum SWR (abt 1.1:1) occurs at 14.400; with the coax
instead, it occurs at about 14.200. Something's going on inside that green
box, and I don't think there's any alternative to going in... report of
any discoveries later.
73, Pete Smith N4ZR
n4zr@contesting.com
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