ED-73F - MOPS for Secondary Surveillance Radar Mode S Transponders

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Issued in December 2020.


Revision F of ED-73, MOPS (Minimum Operational Performance Standard) for Secondary Surveillance Radar Mode S Transponders.

The document has been updated to include changes coming from field experience and from new functionalities linked to the new ADS-B version and ACAS X.

As compared with the previous version, the main changes are:
- Reduction of minimum level 2 transponder capabilities to surveillance and GICB capabilities,
- New requirement to limit RF output power transmitted before, between and after the pulses of a reply,
- Introduction of Mode Reply Rate Limiting function,
- Air/ground status determination clarification,
- ACAS X capability reporting and messages,
- Alignment of register 2016 management on register 0816,
- New transponder register formats,
- Cleaning of EHS tests,
- Phase overlay modulation and messages over long Mode S replies option,
- Basic dataflash capability and removal of old dataflash capability option,
-Interrogation and reply monitoring measurement and messages option.

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