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Home / Avionics / Encoders, Altitude / Trans-Cal /Trans-Cal Altitude Encoder Model Ssd120-35C-Rs232 FAA TSO-C88
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Trans-Cal Altitude Encoder Model Ssd120-35C-Rs232 FAA TSO-C88

12 Reviews 20 Answered Questions
$291.50/Each
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Part# 11-15366
MFR Model# SSD120-35C-RS232

Overview

The smallest, lightest, and lowest power consumption Altitude Digitizer on the market.

The SSD120-35C-RS232 is a solid-state Altitude Encoder that is designed to provide a rugged and reliable altitude digitizer for applications where size, weight and economy are critical. Incorporating one ICAO gray code port, as well as two RS232 serial altitude data outputs, this encoder is a simple and robust addition to any avionics installation requiring accurate pressure altitude information for multiple aircraft systems.

The two asynchronous RS232 outputs provide altitude data on the serial data protocol which is commonly used to provide pressure altitude data to ADS-B, GPS, Auto-Pilots, Transponders and other navigation devices. Six (6) serial data protocols are available. The data protocol is selected through internal shunts or via software set-up. Resolution of the serial altitude data may be set to 100 feet or 10 feet through internal shunts.

Operating Pressure Altitude Range: -1000 to +35,000 feet

Features

  • Featuring the best warranty in the business: 42-month manufacturer direct replacement. If your Trans-Cal encoder experiences a warranty-covered failure, it'll be replaced with a brand new unit with a new 42-month warranty.
  • Average MTBF: 8 years.

Specifications

  • 1/8-27NPT Static Port Inlet
  • One ICAO pressure altitude gray code output
  • Two RS232 serial altitude data outputs
  • Operating Pressure Altitude Range: -1000 to +35,000 feet
  • Comes standard with 10 foot serial resolution
  • Operating Temperature Range: -20ºC to +70ºC
  • Operating Voltage: +10 to +33Vdc
  • Operating Current: +12Vdc @220mA / +28Vdc @270mA
  • FAA TSO-C88a and ETSO-C88a Approved
  • Tested and conforming to MIL-STD-704E and RTCA DO-160E
  • Power and data I/O lines provide on industry standard D-Subminiature Connector
  • Weight: 4.3 oz.

Documents

In The Box

  • SSD120-35C-RS232 Unit
  • Quick Release Mounting Tray
  • Mating Electrical Connector and Back Shell
  • 1/8-27NPT to Tube Fitting and Plug
  • Installation Manual

Reviews

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Great encoder. Working well with Stratus ESG using RS-232 serial data.

George P Verified Purchase

Trans-Cal Altimeter Digitizer Ssd-120-35C-RS232
October 4, 2024

Very simple install and quite versatile encoder. Nice replacement for older grey code.

Gary B Verified Purchase

Trans-Cal Altimeter Digitizer Ssd-120-35C-RS232
July 5, 2024

Easy install, accurate, lightweight. Perfect update from older grey code.

Gary B Verified Purchase

Trans-Cal Altimeter Digitizer Ssd-120-35C-RS232
June 30, 2024

Lindsay A Verified Purchase

Trans-Cal Altimeter Digitizer Ssd-120-35C-RS232
May 22, 2024

This is the gold standard in encoders.

Bay A Verified Purchase

Trans-Cal Altimeter Digitizer Ssd-120-35C-RS232
November 11, 2023

Worked great, easy install. Wish it included #4 or 6 hardware for mounting.

Scaled C Verified Purchase

Trans-Cal Altimeter Digitizer Ssd-120-35C-RS232
May 31, 2022

Excellent product, simple wiring, simple protocol setup if required, low price, but best of all great factory support if ever needed (call Cosmo for tech help)!

Bob K
February 4, 2021

The unit was easy to install and works very well. The previous encoder was not solid state and needed warmup time. This encoder is solid state and has zero warmup time - no more complaints from the tower.

David E
August 14, 2020

This is a go to piece when we need an encoder. Performs well and price is good.

Cindy
February 6, 2020

Simple plug & play replacement. Fast warm up.

Richard K
February 6, 2020

Q&A

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Please note, Aircraft Spruce Australia's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce Australia assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Is this TRANS-CAL ALTITUDE ENCODER MODEL SSD120-35C-RS232 compatible with the Garmin GTX 330?

Yes it is.

Q: Is Trans-Cal altitude encoder model SSD120-35C-RS232 compatible with the Garmin GTX 335 ADS-B transtonder?

Yes, the GTX 335/345 installation manual states that it will accept an input from a Trans-cal SSD120 RS232 encoder unit.

Q: Is this TRANS-CAL ALTITUDE ENCODER MODEL SSD120-35C-RS232 compatible with the Garmin GTX 327?

Yes, this is compatible with the GTX 327 xpdr.

Q: Is this compatible with Stratus ESG? It is not listed in the installation manual.

Yes this encoder will work with the Stratus via RS232 data path.

Q: Is it's usefulness with a 330ES or any other configuration going to be affected in any way as ADS-B becomes a reality?

No, the usefulness will not be affected as the ADS-B uses this information.

Q: Is this encoder compatible with Bendix/King KT-76A ATC?

Yes, it is.

Q: Is the Trans-Cal SSD120-35C-RS232 compatible with the Bendix King KT76C ?

The KT76C uses gray scale coding, please use part number 11-06489 for the KT76C.

Q: Is the Model 120-35C compatible with the Garmin GNC 300Xl

Per the manual, yes, this will work together.

Q: Will this Trans-Cal SSD120-35C-RS232 work with an Apollo SL70? Im needing to replace an AK 350 encoder.

Per the manual, this encoder will work with the SL 70.

Q: Does this come with the connector needed to connect encoder to a Garmin GTX 337?

The Trans-cal encoder will only come with the D-sub connector for the encoder. You will need a GTX D-sub connector to complete the interface.

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