Ralph,
If your SB-200 has not been modified, its relay voltage is negative, and
THAT will cause problems.
The HEXFET in the K3 will take up to 200 volts, but that must be a
positive voltage.
I would suggest adding a small relay in the SB-200 - rectifying the
filament voltage at the transformer with a full wave rectifier and a
capacitor should produce about 8 volts - a resistor could be added in
series to reduce the voltage at the new relay to about 6 volts. YMMV,
but that is the way I would do it. The original wire to the RELAY jack
would go to a NO contact on the relay (other side of the contact to
ground), and the side of the new relay not connected to the newly formed
power source connects to the RELAY jack. That way everything is
contained in the SB-200 and no need for external boxes or sources of
relay power.
73,
Don W3FPR
Ralph Parker wrote:
I'm just about to connect the KEY OUT to the SB-200 relay.
I hope the little transistor in the K3 can take it!
VE7XF
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