Cable for ICOM IC-281H

The transceiver is equipped with an accessory data port which is always a preferred option compared to interface via mic/speaker connections:

The 9600 baud Digirig audio cable will look like this:

DATA 2.5mm TRRS tip (Data input) → 3.5mm TRRS ring 1 (RIG_AFIN)
DATA 2.5mm TRRS ring (PTT) → 3.5mm TRRS ring 2 (RIG_PTT)
DATA 2.5mm TRRS sleeve (GND) → 3.5mm TRRS sleeve (GND)

SP 3.5mm TRRS ring (GND) → No Connection
SP 3.5mm TRRS ring (GND) → 3.5mm TRRS tip (RIG_AFOUT)
SP 3.5mm TRRS sleeve (GND) → 3.5mm TRRS sleeve (GND)

9600 baud audio path is also suitable for standard 1200 baud based digital modes.

NOTE for 9600 bps operation:
• If the transceiver does not transmit (the transmit indicator flashes or does not illuminate), the input level may be higher.
• If the re-try function is activated frequently, the input level may be lower.

Operation:

  1. Connect a TNC to the transceiver’s [SP] and [DATA] jacks.
  2. Set the operating frequency. Push and hold [LOW-DATA] for 1 sec. to select data mode.
    • “DATA” appears.
    • The microphone signals are cut from the modulation circuit while in data mode.
  3. Control the transceiver from a personal computer, etc.
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