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[Yaesu] FT1000MP Band Decoder

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Subject: [Yaesu] FT1000MP Band Decoder
From: c-hawley@uiuc.edu (Chuck (Jack) Hawley)
Date: Thu, 27 Mar 1997 07:16:38 -0600
Frank Davis wrote:
> I found an article in April 1993 QST for a band decoder circuit for the
> ICOM rigs.....its used to remotely control antenna relays.   Does anyone
> know the voltage levels  -or -  signals that appear on the pins of the
> FT1000MP band data DIN jack??  Is the info in the service manual?
> I have a new DOW-KEY 6 position 12V coaxial relay that I would like to
> control with the MP  to get rid of the external control box....cut down
> on desk clutter.

The Yaesu band data connector supplies a binary coded decimal output.
The schematic in the owners manual shows the A, B, C, and D pin numbers.
The output levels are standard 5 volt cmos. Just decode the binary word
with a 4028 cmos chip and combine the outputs with diodes for the
desired band outputs (ie, I combined the 40M and 30M outputs for the
Hercules II amplifier, also 15M and 17M, etc.). In the case of the Herc,
I needed 12V outputs so I used an LM324 to convert the 5V signals to 12V
and then ran the 4028 at 12V (out of the band data jack itself).

Chuck, KE9UW

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