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PART I1
CHAPTER 2
2.3.3 Not applied below FL 245.
CHAPTER 5
5.1.5 Not applied until 1 July 2005.
Remarks: All aeroplanes operated in accordance with JAR-OPS 1 comply from 1 January 2005.
All helicopters operated in accordance with JAR-OPS 3 comply from 1 April 2005.
5.2.1.8 Not applied.
PART 11
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 d~wlm').
The UK specifies receiver sensitivity in terms of the minimum level of input signal (am), 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.
The UK does not specify the effective radiated power but provides for classes of transmitter grouped
into two classifications of 16 watts and 4watts minimum output power, having estimated
radio-linsof-sight distances of 200 nm and 100nm, respectively. A recommendation that the output
power be limited to 25 watts to reduce interference is also made.
Remarks: The use of field strength as a means of determining the effective radiated power is not
industry practice where the radio transmitter output is normally used together with system installation
budget calculations.
2.3.1.3 The UK does not specify the adjacent channel power but defines a spectral mask for the transmitter
occupied spectrum.
Remarks: The use of a spectral mask is industry practice.
2.3.1.4 The UK specifies the modulation as 'hot 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.
Remark: Historically, the receiver frequency stability has never been specified as it has been assumed
that it will be the same as that of the transmitter.
2.3.2.2. I* 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.
Remarks: The use of field strength as a means of determining the sensitivity of a receiver is not
industry practice where the radio frequency input is normally used together with system installation
budget calculations.
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.
* Recommended Practice
UNITEDK ~~GD2O M SUPPLEMENTOT A NNEX1 0, VOLUM1E11 (FIRSTE DI~ON)
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.
Remarks: The UK believes the note (paragraph 2.3.2.5 a)) is confusing as it specifies a phase noise
level related to 45 dB rather than 60 dB. This note is also contained within UK guidance material
(ED 23B) for the 45 dB adjacent channel rejection ratio.
The UK does not specify the adjacent channel rejection for 25 kHz, 50kHz or 100 kHz channel
spacing.
Remark. The UK uses 8.33 kHz spacing (for aircraft flying above FL 245) only.
Not yet implemented.
Remark Development work in progress.
The UK requires that for aircraft (including helicopters) of 5 700 kg MTWA or less non-immune VHF
Comm receivers may be permitted and the aircraft permitted to operate under IFR provided that crews
are alerted to potential sources of interference.
Remarks: This reflects the much perceived much reduced risk posed to comm. receivers as compared
to ILS and VOR receivers. No evidence notified to date to justify areconsideration of this relaxation.
* Recommended Practice
1/3/05

Transmittal Note
SUPPLEMENT TO
ANNEX 10 - VOLUME I11
AERONAUTICAL TELECOMMUNICATIONS
(First Edition)
1. The attached Supplement to Annex 10, Volume III includes differences notified by Contracting
States up to 31 May 1996.
2. This Supplement should be inserted at the end of Annex 10, Volume III, First Edition. Additional
differences and revised comments received from Contracting States will be issued at intervals as
amendments to this Supplement.
SUPPLEMENT TO ANNEX 10 - VOLUME 111
(FIRST EDITION)
AERONAUTICAL TELECOMMUNICATIONS
Differences between the national regulations and practices of Contracting
States and the corresponding International Standards and Recommended
　
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