Icom IC-970 9600 Baud, H, FT-736 R radio Modification guide

Below you will find brief information for radio IC-970 9600 Baud, radio IC-970H, radio IC-970. This guide will explain the modifications needed to make these radios work correctly with different applications. It covers using the IC-970 with a 9600 baud modem, expanding the RF range of the IC-970H, setting up the IC-970H for repeater operation, and controlling the AFC for satellite use. It also includes a separate logic board design for the Yaesu FT-736R radio.

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Icom IC-970 9600 Baud, IC-970H Modification Guide | Manualzz

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Key features

  • 9600 baud modem connectivity for IC-970
  • Expanded RF range for IC-970H
  • Repeater operation for IC-970H
  • AFC control for satellite use
  • Logic board for Yaesu FT-736R

Frequently asked questions

Solder a shielded wire to the anode of D16 (1SV50E) for transmit and to pin 9 of IC11 (MC3357P) for receive. Bring these wires out the rear of the radio. Make sure the TNC and modem are connected to a clean power supply and that the TNC modem switch is set to 9600 baud.

Cut resistors R187, R190, R219, and R191. Add a 10K Ohm resistor in the position of R1887. Reset the microprocessor.

Set the main and sub frequencies. Turn the radio off. Press the LOCK switch on. Press and hold the FUNCTION and M/S switches and turn the radio on.

Use the provided logic board design, which includes an LM339 IC, resistors, LEDs, and potentiometers. Connect the logic board to the radio's microphone pins and adjust the potentiometers to center the satellite frequency.
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