FT-950 and KPA500 Interfacing

[AJ8MH-Radio.Joe.Hutchens]

My amp has shipped and will be here in a week.  I have a question for
those of you using the KPA500 AUX connection with the FT-950 linear
interface connection on the rear panel.

The KPA500 manual I downloaded says pin 8 (TX INH) and pin 3 (GND) from
the FT-950 must be connected together then connected to pin 5 on the
KPA500 AUX connector.  I looked at the FT-950 schematic and it appears
pin 8 can be left floating.

Also, have you had any issues with band selection using the FT-950
linear interface connection?

I realize the KPA500 has RF sensing for band selection, but I would like
to take advantage of the linear port available on the Yaesu.

Joe Hutchens  ( AJ8MH )
http://webpages.charter.net/aj8mh-radio/
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[Phil Salas]

“The KPA500 manual I downloaded says pin 8 (TX INH) and pin 3 (GND) from the FT-950 must be connected together then connected to pin 5 on the KPA500 AUX connector. I looked at the FT-950 schematic and it appears pin 8 can be left floating.Also, have you had any issues with band selection using the FT-950 linear interface connection?”

Joe – Most Yaesu big radios have a micro-switch in the Band Data connector that opens the transmit inhibit line when an external connector is plugged in.  I know this is the case with the FT-990, FT-1000, and FT-1000MKV and MKV field.  If this is the case, then you do need to ground the TX INH pin.

The FT-950 Band Data output is exactly the same as the K3 output (Yaesu ABCD vs Elecraft 0123).  There are no issues.

Phil – AD5X
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