[TenTec] SB-220 and 221 relays

[Gerald C Totten]

  To add to the discussion, I have had a lot of trouble keying the SB-220
with several TEN-TEC rigs that use a CPU.  That rather high voltage DC
relay creates a big spike when the contacts open which can lock up the
CPU.  My solution has been an external transistor interface.  I believe I
got the info from the Rich Measures web site.  Rich has helped many a ham
tame an unruly amplifier.

73
Jerry  K8JRO

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