EVS-EN 303 489 V1.1.1:2026

The present document specifies technical characteristics and methods of measurements for the following equipment used in ground-based ATC Surveillance for civil air navigation:
• Wide Area Multilateration (WAM) systems with Mode S capabilities which may include Mode A/C,
transmitting at 1 030 MHz and at 1 090 MHz, and receiving at 1 090 MHz, used for air traffic control with or
without 1 090 MHz phase overlay.
The system operates in the frequencies as indicated in Table 1 below.
Table 1: WAM service frequencies
Signals; Service frequencies
Interrogation Transmission; 1 030 MHz
Reference/Test Transmission; 1 090 MHz
Receive; 1 090 MHz
Antennas for this equipment are passive.
Remote Field Monitors (RFM) as described in ETSI EN 303 363-2 as well as Vehicle transmitters as described in
ETSI EN 303 213-5-2 are not covered in the present document.
NOTE: The relationship between the present document and essential requirements of article 3.2 of
Directive 2014/53/EU is given in Annex A.