Draft Details
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 [i.6] as well as Vehicle transmitters as described in [i.7] 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 [i.1] is given in Annex A.
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