Sigtronics Spo-23 2 Place Portable Stereo

The Sigtronics Transcom III SPO-23 is a portable two-place stereo intercom designed for use with aviation headsets. It provides voice-activated communication between two headset positions, with a stereo/mono selector to suit the connected headsets.

The SPO-23 features an auxiliary input for a mobile phone or portable music source, allowing auxiliary audio to be heard through the intercom while retaining radio communication capability. Separate push-to-talk inputs are provided for pilot and co-pilot positions, and radio-priority operation is designed to transmit only the active crew member’s voice.

• Manufacturer part number: SPO-23
• Two-place portable stereo intercom
• Compatible with stereo or monaural headset configurations via selector switch
• Voice-activated intercom operation with adjustable squelch and volume controls
• Auxiliary input for phone or portable music source
• Dual pilot/co-pilot push-to-talk inputs
• Operates from an internal 9 V battery or 11–34 V DC aircraft power
• Manufacturer-stated dimensions: approximately 10.2 × 7.4 × 5.1 cm

Manufacturer documentation: Transcom III operating instructions and specifications (PDF).