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Yaesu FT757-GX-1 program by N4LSJ

This program works for the FT-757GX -MARK 1- only. The MK2 programming is not quite the same, so this program is not considered compatible with the FT-757GX 2. This program is for experimental use and is not professional programming.

SEE OCTOBER 1985 QST ARTICLE PAGE 38 TITLED, "A CAT Control System"

On page 39, a schematic is there for a circuit that uses a TIL-111 optoisolator. You want the TIL-111 optoisolator circuit. It's the cleanest thing I've tried yet. Other solutions can carry too much noise for the overly sensitive TTL level serial interface.

The optoisolator circuit is driven by TTL level, not actual RS-232, so you'll want to use TTL level serial, such as from an RS-232 to TTL converter. Don't wire the RS-232 straight to the circuit.

The FT757-GX speaks at one speed: 4800 baud. Use stty or some such to set your port speed before starting the program.

The connector on the back of the YAESU FT-757GX is called a 3-pin JST-XH with 2.54mm pitch

For keying, a 5V reed relay with a cap across the contacts to the rig, and the relay's coil across a GPIO pin and ground, specified in the keyer= variable will work nicely. Be sure you know the difference between BOARD and BCM with regard to the GPIO library before choosing which pins to tie your relay to.

The first time you run this program, it will ask you for your Call, a Frequency, WPM, and a serial port.

If you get something wrong, you can edit or delete your .yaesuft757gx.conf file and it will build new next time you run the program

DATA BYTE: | START BIT | D0 | D1 | D2 | D3 | D4 | D5 | D6 | D7 | STOP BIT | STOP BIT |

5 BYTE BLOCK COMMAND | PARM 4 (LSD) | PARM 3 | PARM 2 | PARM 1 | INSTRUCTION (MSD) |