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--- In FT817@y..., Christian.Frankl@t... wrote:

Hello Ham Operators!
Did anyone yet built his own CAT Interface for the FT-817?
A circuit plan for this Interface would be appreciated!
Thank you for writing back!

Chris, DL6RDM

Yes -

To make a CT-62 yourself (I disassembled and reverse engineered a
real CT-62 and copied it using a MAX-232 chip with N4IP on the #AMSAT
IRC a couple of months back). Yaesu use a different chip to the
MAX232 which uses lower value capacitors to keep it small so it will
fit in a 9 pin D-type case.

o On Page 5 of the FT817 manual, you'll see the pin-outs of the
8 pin mini DIN ACC port

o You only need GND, TXD, RXD and 13.8V of 8 pin mini DIN

o Wire up a 5V regulator to GND and 13.8V

o Wire up you MAX232 to the 5V regulator.

o Wire up the Caps as you would normally do so on a MAX-232

o MAX232 Pin 12 to RXD on 8 pin mini DIN

o MAX232 Pin 11 to TXD on 8 pin mini DIN

o MAX232 Pin 13 to pin 3 of DB9 female

o MAX232 Pin 14 to pin 2 of DB9 female

o Wire DB9 Pins 7 and 8 [RTS & CTS] together

o Wire DB9 Pins 6 and 4 [DSR & DTR] together

That's it!

73 Howard G6LVB

Thank you!

Chris, DL6RDM

howard@... schrieb:

--- In FT817@y..., Christian.Frankl@t... wrote:

Hello Ham Operators!
Did anyone yet built his own CAT Interface for the FT-817?
A circuit plan for this Interface would be appreciated!
Thank you for writing back!

Chris, DL6RDM

Yes -

To make a CT-62 yourself (I disassembled and reverse engineered a
real CT-62 and copied it using a MAX-232 chip with N4IP on the #AMSAT
IRC a couple of months back). Yaesu use a different chip to the
MAX232 which uses lower value capacitors to keep it small so it will
fit in a 9 pin D-type case.

o On Page 5 of the FT817 manual, you'll see the pin-outs of the
8 pin mini DIN ACC port

o You only need GND, TXD, RXD and 13.8V of 8 pin mini DIN

o Wire up a 5V regulator to GND and 13.8V

o Wire up you MAX232 to the 5V regulator.

o Wire up the Caps as you would normally do so on a MAX-232

o MAX232 Pin 12 to RXD on 8 pin mini DIN

o MAX232 Pin 11 to TXD on 8 pin mini DIN

o MAX232 Pin 13 to pin 3 of DB9 female

o MAX232 Pin 14 to pin 2 of DB9 female

o Wire DB9 Pins 7 and 8 [RTS & CTS] together

o Wire DB9 Pins 6 and 4 [DSR & DTR] together

That's it!

73 Howard G6LVB

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--
Gre aus Straubing,
Christian Frankl
Tel 0171-6380227

Chris;
I built a simpler cable/converter that works well.
Go to and look at the
bottom of the schematic on page 2. I just built the serial interface
part that is involved with the DB9 connector at bottom right. I was
able to (tightly) get a bit of perfboard and the circuit inside the
DB9 housing. I only used one of the Key or PTT lines though. If you
want to build it I'll check on which one. Whichever it is uses a
seperate shielded line also out of the DB9 shell and terminates in a
1/8" audio plug.
I've used it a few times now with FTBasic to load/unload memories.
Good luck!

Tony, VE3TNW