Has anyone cracked this nut yet? I'm doing a mod to my Henry 2KD-4 to
replace the open frame T-R relay with Gigavac relays. I'm using the
SEQ-QSK sequencer to drive the relays. I want to use the "TX-INH"
(transmit inhibit) line into my FT-2000 to keep it from sending power to
the Henry while the relays are in motion.
The "TX-INH" line is on pin 8 of the "Band Data" plug on the FT-2000 and
is intended for use with Yaesu's amps. Trouble is there isn't a spec for
that line I can find. So I looked in the VL-1000 service manual to see
what Yaesu does with it. Now I'm even more confused. The lead starts out
life as an open collector pulled up to +13.8V with a 10K resistor on the
"Main" board. It then goes on to a connector board where it is diode
clamped to between +5 and 0 after a 1K resistor. I've seen other
references online to it being +13V to inhibit transmit and 0 enable
transmit. That seems at odds with it being clamped to the +5 and gnd
rails in Yaesu's amp.
Any thoughts?
Thanks, Bill - WB6RFW
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