Description

Connects the Icom IC-705 to the audio socket of a Digirig interface.

The IC-705 has a built-in USB sound card and serial port, so most computer setups need no interface at all. This cable is for setups that can’t use them, such as iPhone and iPad digital-mode apps, which can’t send serial commands to key the radio.

• 3.5mm TRRS plug for the Digirig audio socket
• 3.5mm TRS plug for the IC-705 [SP] jack
• 4-pole 2.5mm plug for the IC-705 [MIC] jack
• PTT through a 33 kΩ resistor onto the radio’s combined microphone/PTT line, the way the IC-705 is keyed

Usage notes:

• Plug the 3.5mm plug into [SP] and the 2.5mm plug into [MIC] on the radio, and the TRRS plug into the Digirig audio socket
• With Digirig Lite, the radio is keyed by Lite’s VOX-style PTT, so apps without serial control can transmit
• With Digirig Mobile, set PTT to RTS on the Digirig serial port in your app

Discussion and background: IC-705 cable thread on the Digirig forum.