You should check with Harbach electronics, I believe they make an
inexpensive low voltage keying kit fot the SB-220.
73,
Bob - KL7FM
---Scott Ellington <sdelling@facstaff.wisc.edu> wrote:
>
> Caution: The SB-220 control relay can cause serious damage to a
transceiver. It
> has a 110 Volt DC coil, and NO catch diode. Even if the transceiver
uses a
> relay to control the amplifier, it can be damaged.
>
> The catch diode can be added, which MAY make it safe to switch with
the
> relay in the transceiver. A safer approach is to use a buffer relay
with
> a low voltage coil and a catch diode. The catch diode should still
be added
> to the SB-220 to protect the buffer relay contacts.
>
>
> --
> 73,
>
> Scott K9MA
> sdelling@facstaff.wisc.edu
>
> --
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>
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