Trans-Cal SSD120-30N Nano Altitude Encoder

The Trans-Cal SSD120-30N Nano Altitude Encoder is a solid-state pressure sensing device designed to provide accurate pressure altitude information to aircraft transponder systems. It measures static air pressure and converts the data into ICAO-compliant parallel output for pressure altitude reporting.

Using industry-standard ICAO pressure altitude Gray Code output, the SSD120-30N is compatible with a wide range of Mode C and Mode S transponders commonly installed in general aviation aircraft. Its compact “nano” form factor allows flexible installation in space-constrained avionics bays and retrofit applications.

Manufactured by Trans-Cal Industries, the SSD120-30N is engineered for aviation environments and supports reliable altitude reporting critical for air traffic control surveillance and aircraft separation. Installation is performed in accordance with applicable aircraft data and manufacturer instructions to ensure compliant and accurate operation.

Key Features

• Solid-state altitude encoder with no moving parts
• Measures static air pressure and converts to pressure altitude
• ICAO-compliant parallel Gray Code output
• Compatible with Mode C and Mode S transponders
• Compact nano form factor for flexible installation
• Manufactured by Trans-Cal Industries for aviation use