[Yaesu] RE: SB-220 Connections

[Scott Ellington]

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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