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The FM interferences produced in old VHF COM receivers, if any, are negligible (unless further
studies prove otherwise), and in any case the forthcoming 8.33 kHz receivers will provide the new
FM immunity.
___________________
1/9/06
SUPPLEMENT TO ANNEX 10, VOLUME III (FIRST EDITION) NEW ZEALAND 1
PART II
CHAPTER 2
2.3.3 Not a mandatory requirement.
CHAPTER 5
5.1.1 ELT installed prior to 1 April 1997 shall meet the requirements of TSO C91 or TSO C91a and
when they become unserviceable they shall be replaced with an ELT meeting the requirements of
C19a or TSO C126.
Remarks: CAR 91 A15 (f).
5.1.3 Not implemented.
5.1.4
5.1.5
5.2.1.8 ELT installed prior to 1 April 1997 shall meet the requirements of TSO C91 or TSO C91a and
when they become unserviceable they shall be replaced with an ELT meeting the requirements of
C19a or TSO C126.
Remarks: CAR 91 A15 (f).
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1/9/06
SUPPLEMENT TO ANNEX 10, VOLUME III (FIRST EDITION) NORWAY 1
PART II
CHAPTER 2
2.3.3 The requirement for operators to install VHF communication receivers in aircraft by 1 January
1998, that meet FM immunity requirement according to this paragraph, will only be applied to
new receivers. Old VHF COM receivers not meeting the new FM immunity criterion after 1
January 1998 do not have to be modified to meet the new requirements.
CHAPTER 5
5.1.9 b) Norway does not comply with this paragraph.
5.1.9 c) Norway does not comply with this paragraph.
5.2.1.8 Norway does not comply with this paragraph. The requirement will only be applicable to new
equipment. Old equipment does not have to be modified solely to meet the requirement.
___________________
1/9/06
SUPPLEMENT TO ANNEX 10, VOLUME III (FIRST EDITION) SWEDEN 1
PART II
CHAPTER 2
2.3.3 Not applied below FL 245.
CHAPTER 5
5.1.4 Only aircraft operated in accordance with JAR-OPS comply.
5.1.5
5.2.1.8 Not applied.
___________________
1/9/06
SUPPLEMENT TO ANNEX 10, VOLUME III (FIRST EDITION) UNITED KINGDOM 1
PART II
CHAPTER 2
2.2.1.2* The UK interprets “On a high percentage of occasions” to be the 95 percentile value and thus
requires the effective radiated power to be such as to provide a field strength of at least
188 microvolts per metre (minus 101 dBW/m2).
2.2.2.2 The UK specifies receiver sensitivity in terms of the minimum level of input signal (dBm),
modulated 30 per cent by a sinewave of 1 kHz, applied to the receiver which is required to
produce a SINAD ratio of 12 dB at the audio output measured with a psophometric filter.
2.2.2.3 CAP 670 COM 02 Appendix includes both 25 kHz and 8.33 kHz channel spacings specified in
values of kHz and not percentage of the assigned frequency.
2.3.1.2 The UK does not specify the effective radiated power but provides for classes of transmitter
grouped into two classifications of 16 watts and 4 watts minimum output power, having an
estimated radio-line-of-sight distance of 200 nm and 100 nm, respectively. A recommendation
that the output power be limited to 25 watts to reduce interference is also made.
2.3.1.3 The UK does not specify the adjacent channel power but defines a spectral mask for the transmitter
occupied spectrum.
2.3.1.4 The UK specifies the modulation as “not less than 70 per cent” when modulated by a 1 000 Hz
audio frequency signal.
2.3.2.1 The UK does not define the frequency stability of receiver.
2.3.2.2.1* The UK specifies the sensitivity in terms of a radio frequency input signal not exceeding
10 microvolts (-93 dBm), with 30 per cent modulation at 1 000 Hz to produce a signal plus noise
to noise ratio of 6 dBm with an audio output power not less than 10 dB below the declared output
power.
2.3.2.3
2.3.2.4
The UK does not state the effective acceptance bandwidth but defines the effective bandwidth
relative to the selected channel frequency of the receiver at the 6 dB and 60 dB points.
2.3.2.5 The specification the UK applies only states the adjacent channel rejection for 8.33 kHz channel
spacing. For 8.33 kHz channel spacing an adjacent channel rejection of 45 dB is specified at the
first upper and lower adjacent channels for defined desired and interfering signals.
2.3.2.6* The UK does not specify the adjacent channel rejection for 25 kHz, 50 kHz or 100 kHz channel
spacing.
2.3.2.8.1
2.3.2.8.2
2.3.2.8.4
2.3.2.8.4.1
Not yet implemented.
* Recommended Practice
1/9/06
2 UNITED KINGDOM SUPPLEMENT TO ANNEX 10, VOLUME III (FIRST EDITION)
2.3.3.1
2.3.3.2
2.3.3.3
The UK requires that for aircraft (including helicopters) of 5 700 kg MTWA or less non-immune
　
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