We are pleased to announce the publication of ED-73F “MOPS for Secondary Surveillance Radar Mode S Transponders.”
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.

Available on the EUROCAE website.