Radio-TNC Wiring Diagrams

For hand-held radio models:
Alinco - models with mic and speaker to same plug
Icom IC-W2A style - mic and speaker to same plug

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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 Plug

Alinco with mic and speaker to same plug, Icom IC-W2A and newer

diagram

Speaker/Mic Plug (2.5 mm stereo) to Speaker/Mic Jack
Ring of plug - Transmit Signal through a 0.1 microfarad capacitor
Ring of plug - PTT through a 3.9 Kohm resistor (Alinco HTs may require about 15 Kohm)
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/iw2a.html