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NOTE: Where the UK has differences filed to SARPs, these will be published in Supplements to the Annexes and in the UK AIP.
5 Site Requirements
5.1 Site Effects
5.1.1 After equipment installation, possible site effects and their impact on coverage shall be assessed (336).
5.1.2 Local site obstructions shall be shown to be acceptable for the required coverage (337).
5.1.3 Recommendation: This should be provided by a 360 degree representation giving the elevation (in degrees) of any obstruction versus bearing and a 'line of sight' coverage chart for several target heights based on these radar obstructions and using the Radar earth curvature (338).
5.1.4 To provide Surveillance Radar Approach (SRA) procedures the radar head shall be within 37 km of the Missed Approach Point, for each runway (339).
5.2 Site Safeguarding
In the absence of manufacturer’s data, refer to Part B, GEN 02 Technical Safeguarding of Radio Sites - Guidance Material section, for appropriate guidance.
6 Site Restrictions
Access to the radar and associated equipment shall be restricted such that the availability of the Air Traffic Service is not compromised accidentally or otherwise (340).
7 Aerial Support Structure
7.1 The stability of the aerial tower affects the system performance, especially clutter reduction and radar return position accuracy. The aerial stability limits allocated to the tower shall be justified (341). An analysis of the tower structure must show that limits are met at the stated operating wind speed and ice loading (342). The assessment method chosen shall be in accordance with the relevant standards and requirements in force (343).
7.2 Recommendation: The aerial support structure should be constructed to survive the excesses of once in 50 years wind speed (344).
8 Environmental Conditions
8.1 The design and testing regime shall demonstrate that the equipment operates as required in the chosen environment (345).
8.2 Recommendation: All radar transmission equipment should be located in a controlled environment with appropriate heat dissipation and dust control (346).
9 Transmitter Requirements
9.1 Primary Frequency Bands
9.1.1 The following bands shall be used (347):
590 MHz to 598 MHz (50 cm) 1215 MHz to 1365 MHz (23 cm) 2700 MHz to 3100 MHz (10 cm) 9000 MHz to 9200 MHz and
9300 MHz to 9500 MHz (3 cm) 15.4GHz to 15.7GHz (GMR) 34.5GHz to 35.5GHz (ASMI)
9.2 Primary Frequency Tolerance
medium/long range radar services. medium/long range radar services. short/medium range radar services.
short range radar services. very short range radar services. very short range radar services.
9.2.1 The following stability tolerances shall be applied (348):
Frequency Band Stability Tolerance
590 MHz–1365 MHz within 500 ppm
2700 MHz–9500 MHz within 1250 ppm
15.4 GHz–35.5 GHz within 5000 ppm
9.2.2 Details of transmitter frequency stability shall be stated (349). A temperature chamber shall be used to exercise the transmitter over the full specified temperature range (350). A practical trial of ageing effects shall show that the inspection intervals are consistent with the required stability (351).
9.3 SSR Frequency Bands The frequency of the SSR transmitter shall be 1030 MHz (352). NOTE: The transmitting frequency of the transponder (air to ground or from a SSR
Site Monitor) is 1090 MHz.
9.4 SSR Frequency Tolerance
9.4.1 The output transmitter carrier frequency shall have a tolerance of ±0.2 MHz (353).
9.4.2 The carrier frequencies of the control transmissions and each of the interrogation transmissions shall not differ from each other by more than 0.2 MHz (354).
NOTE: The transponder output carrier frequency tolerance (ground to air or from SSR Site Monitor) is ±3 MHz.
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CAP 670 Air Traffic Services Safety Requirements 2(82)
