Doc 9718 an/957 Handbook on Radio Frequency Spectrum Requirements for Civil Aviation

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9.5.2 This definition is intended to include a wide range of equipment in which the heating effect of RF energy is utilized to perform industrial and medical processes. High powers can be generated especially for such processes as metal hardening (e.g. car engine crankshafts), but the application area is local to the RF head. Measurement standards are often difficult to define, and this is particularly true in the case of large equipment assembled on site. Electromagnetic screening measures must be efficient in constraining the escape of energy and effective in maintaining that level of protection.

Radio Regulations
9.5.3 In the Radio Regulations, ISM does not fall within the definition of a radio service and is hence not subject to any of the provisions of the Regulations. Nevertheless, frequencies are designated for ISM use with the condition that radio services must accept interference if they are operated on the same frequencies. The text of the Regulation concerned is:

5.150 The following bands:
13 553–13 567 kHz (centre frequency 13 560 kHz),

26 957–27 283 kHz (centre frequency 27 120 kHz),

40.66–40.70 MHz (centre frequency 40.68 MHz),

902–928 MHz in Region 2 (centre frequency 915 MHz),

2 400–2 500 MHz (centre frequency 2 450 MHz),

5 725–5 875 MHz (centre frequency 5 800 MHz), and

24–24.25 GHz (centre frequency 24.125 GHz)

are also designated for industrial, scientific and medical (ISM) applications. Radiocommunication services operating within these bands must accept harmful interference which may be caused by these applications. ISM equipment operating in these bands is subject to the provisions of No. 15.13.

The text of RR 15.13 is:

15.13 9. Administrations shall take all practicable and necessary steps to ensure that radiation from equipment used for industrial, scientific and medical applications is minimal and that, outside the bands designated for use by this equipment, radiation from such equipment is at a level that does not cause harmful interference to a radiocommunication service and, in particular, to a radionavigation or any other safety service operating in accordance with the provisions of these Regulations.

9.5.4 In the above list (RR 5.150), particular attention has to be given to the frequencies in the 13 MHz and 27 MHz bands, since harmonics of these fall into both the ILS/VOR and the VHF COM bands with the potential in each case to affect a number of assignment points within each harmonic spread (as indicated in Figure 9-2).

Figure 9-2.    ISM frequencies

Control of ISM equipment
9.5.5    International action to agree on standards and conditions for the radio frequency radiations from ISM equipment takes place under the aegis of the International Special Committee on Radio Interference (CISPR), which is a component of the International Electrotechnical Commission (IEC). These standards are voluntary, and it is the responsibility of national authorities to decide on the extent and the nature of their national legislation required for the control of interference from these systems.
ITU-R Recommendations and CISPR publications
9.5.6    Recommendation ITU-R SM-1056 recommends the use of CISPR Publication 11 as a guide for the application of limits and methods of measurement for ISM equipment.

Very small aperture terminals (VSAT) and

satellite news gathering (SNG) systems
9.5.7    VSAT/SNG systems or other small satellite terminal (e.g. SIT) systems are portable satellite Earth terminals used by news agencies and other similar organizations for immediate deployment at any site which requires on-the-spot relay of news and information. Their operating frequencies are in the bands between 18 and 40 GHz. Their use in the environs of airports can cause interference to aeronautical radio and control systems on board aircraft, and strict control is necessary.
9.5.8    The Aeronautical Communications Panel (ACP) is studying this issue with a view to formulating an ICAO policy. This policy would recommend maximum levels or distances from critical areas to be applied by regulatory authorities.
9.5.9    Discussions on this subject with radio regulatory authorities are continuing in the United States and Europe.

9.6    GENERAL PROTECTION LIMITS

FOR AERONAUTICAL RADIO
The limits displayed in Table 9-1 are intended to give general guidance. For individual analysis, reference should be made to the complete definitive texts in the authoritative documents. Particular attention in these cases needs to be given to the specific spectral characteristics of the interfering systems.
These limits can ONLY be applied to assess intra-system interference and CANNOT be used to assess compatibility between systems with different RF or spectral characteristics.

Table 9-1. General protection limits
Not to be used for assessing compatibility with dissimilar systems

	Use	Frequency band	Minimum signal dB (uV/m)	Intra-system planning protection ratio DB
1	Omega	10–14 kHz
2	NDB	190–850 kHz	37 (1)	15
3	HF communications	2.8–22 MHz		15
4	ILS marker beacon	74.8–75.2 MHz	46 (1)	20
5	ILS localizer	108–112 MHz	40 (1)	20
6	VOR	108–118 MHz	39 (1)	20
7	VHF communications	118–137 MHz	37 (1)	14
8	ILS glide path	328.6–335.4 MHz	52 (1)	20
9	ELT	406 MHz
10	DME	960–1 215 MHz	71 (1)	8
11	SSR	1 030–1 090 MHz
12	Primary radar (23 cm)	1 215–1 350 MHz
13	Satcom (S to E)	1 545–1 555 MHz
14	GPS	1 559–1 610 MHz	–160 dBW (3)
15	GLONASS	1 559–1 610 MHz	–160 dBW (3)
16	Satcom (E to S)	1 645.5–1 655.5 MHz
17	PSR (10 cm)	2 700–3 300 MHz
18	Radio altimeter	4 200–4 400 MHz
19	MLS	5 030–5 150 MHz	58	20
20	Air weather radar	5 350–5 460 MHz
21	Air weather radar	9 345–9 375 MHz
22	Primary radar (3 cm)	9 000–9 500 MHz
23	Air Doppler navigation	13.25–13.4 GHz
24	ASDE	15.4–15.7 GHz
25	RSMS	15.4–15.7 GHz
Notes.— 1. Signal levels specified in Annex. 2. 137 dBW/m2/MHz (wide-band signals) –147 dBW/m²/MHz (narrow-band signals) (Source: Navigation Systems Panel (NSP)). 3. At receiver terminals.

Directory: safety -> acp -> repository
acp -> Information paper
acp -> Acp wgc6/WP24 aeronautical communications panel (acp) working group c meeting 6 Toulouse, France October 20-24, 2003
acp -> Joint meeting of the
acp -> Working paper
acp -> Amcp wgm/WP19 19 August 2002 Aeronautical Mobile Communication Panel (amcp) Working Group-m meeting Fifth Meeting Saint Petersburg, Russia, 19 to 23 August 2002 Agenda Item 4: satcom
acp -> Acp wgf/16 wp 27 Rev. 1 International Civil Aviation Organization
acp -> Working paper
acp -> Working paper
repository -> Doc 9718 an/957 Handbook on Radio Frequency Spectrum Requirements for Civil Aviation

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