Radio-TNC Wiring Diagrams

For hand-held radio models:
ADI
Alinco - models with separate mic and speaker plugs
Icom IC-O2AT, IC-2AT style - separate mic and speaker plugs

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Manufacturers have been known to change their usage of pins, please compare diagrams shown with the product's manual. Pins not shown may be used for other functions. Damage may occur if wrong connections are made.

Pins are labeled with the number of the pin, followed by the descriptive name used in Chapter 5 of What is your TNC doing?

Mic and Speaker Plugs

ADI, Alinco with separate mic and speaker plugs, Icom IC-O2AT, IC-2AT and newer

diagram

Mic Plug (2.5 mm stereo) to Mic Jack
Tip of plug - Transmit Signal through a 0.1 microfarad capacitor
Tip of plug - PTT through a 3.9 Kohm resistor

(N0VNM reports that for an Alinco DJ-F1T to a PK-232, he successfully used a 0.022 microfarad capacitor and an 11 K resistor. He also wired the ground and shield to the sleeve of the mic plug.)

Speaker Plug (3.5 mm mono) to Speaker (SP) Jack
Tip of plug - Receive Signal
Sleeve of plug - Ground

Turn off battery saver

Or, wire with a transformer instead of a capacitor & resistor

diagram

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URL: http://prairie.lakes.com/~medcalf/ztx/wire/i2at.html