Reviewing the schematic on Ameritron.com for RCS-4 there is a 220uF
electrolytic across each relay coil. There are also a pair of diodes
which will clamp the coil voltage, although it might not be immediately
apparent since they're not directly across the coils. Unlikely that
these parts are missing since they're not just clamps, but necessary for
the selector to function.
This does not look like any design flaw of the RCS-4. If I had to guess
without seeing the hardware, it seems more likely that a failure
occurred to cause hot switching of the antenna... if that was happening
repeatedly, the finals wouldn't be happy!
73,
Josh W6XU
Inside the relay box I found no diodes and no capacitors across the relays that
might have been used in the design to avoid this kind of problem.
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