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CHAPTER 2
2.3.3.1 The requirement for operators to install VHF communication receivers in aircraft by 1 January 1998
2.3.3.2 which meet the FM immunity requirements spelled out in this paragraph will only be applied to new
receivers. Old VHF COM equipment not meeting the new immunity criteria after 1 January 1998 will
not have to be modified solely to meet the new FM immunity requirements.
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.
SUPPLEMENTTO ANNEX1 0, VOLUMEII I (FIRSTE DITION) NORWAY1
PART I1
CHAPTER 2
2.3.3 The requirement for operators to install VHF communication receivers in aircraft by 1 January 1998, that
meet FM immunity requirements according to this article, 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 solely to meet the new requirement.
CHAPTER 5
5.1.9 b) and c) Norway does not comply with the articles.
5.2.1.8 Norway does not comply with the article. The requirement only applies for new equipment. Old
equipment has not been modified solely to meet the requirement.
SUPPLEMENTTO ANNEX1 0, VOLUMEII I (FIRSTE DITION) SWEDEN1
PART I1
CHAPTER 2
2.3.3 Not applied below FL 245.
CHAPTER 5
5.1.5
5.2.1.8
Not applied until 1 January 2004.
Not applied.
PART I1
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 ~ B W I ~ ~ ) .
The UK specifies receiver sensitivity in terms of the minimum level of input signal (dBm), modulated
30 per cent by a sinewave of I 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-line-of-sight distances of 200 nm and 100 nm, 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.
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.
The UK specifies the modulation as "not less than 70 per cent" when modulated by a 1 000 Hz audio
frequency signal.
The UK does not define the frequency stability of receiver.
Remarks: 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.
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 I 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 INGDOM 2 SUPPLEMENTT O ANNEX1 0, VOLUMEI II (FIRSTE DITION)
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.
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.
2.3.2.6* The UK does not specify the adjacent channel rejection for 25 kHz, 50 kHz or 100 kHz channel
spacing.
Remarks: The UK uses 8.33 kHz spacing (for aircraft flying above FL 245) only.
2.3.2.8.1 Not yet implemented.
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