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0.85 shall be achievable.
2.2.1 -4 Recommendation.- Means should be provided
to maintain the average modulation factor at the highest
practicable value without overmodrrlation.
2.1.1.4 The design polarization of emissions shall bc
vertical.
2.2.2 Receiving function
2.2 SYSTEM CEIARACTEFUSTICS OF
THE GROUND INSTALLATION
2.2.1 Transmitting function
2.2.1.1 Frequency stability. The radio frequency of
operation shall not vary more than plus or minus 0.005 per
2.2.2.1 Frequency stability. Where 8.33 kHz channcl
spacing is introduced in accordance with Volume V, the radio
frequency of operation shall not vary more than plus or minus
0.0001 pcr cent froin the assjgned frequency.
2.2.2.2 Sensitivity. After due allowance has been made
for feeder loss and antenna polar diagram variation, the sensitivity
of the receiving function shall be such as to providc on a
high percentage of occasions an audio output signal with a
7/11/96
No. 71 ANNEX 1 0 - VOLUME III
Part II Annex 10 - Aeronautical Xelecommunications
wanteuunwanted ratio of 15 dB, with a 50 per cent amplitude
modulated (A3E) radio signal having a field strength of
20 microvolts per metre (minus 120 dJ3w/m2) or more.
2.2.2.3 Effective acceptance bandwidth. When tuned to
a channel having a width of 25 kHz, 50 kHz or 100 kHz, the
receiving system shall provide an adequate and intelligible
audio output when the signal specified at 2.2.2.2 above has a
carrier frequency within plus or minus 0.005 per cent of the
assigned frequency. When tuned to a channel having a width
of 8.33 kHz, the receiving system shall provide an adequate
and intelligible audio output when the signal specified at
2.2.2.2 above has a carrier frequency within plus or minus
0.0005 per cent of the assigned frequency. Further information
on the effective acceptance bandwidth is contained in
Attachment A to Part II.
Note.- The eflective acceptance bandwidth includes
Doppler shif.
2.3.1.3 Adjacent channel power. The amount of power
from a 8.33 kHz airborne transmitter under all operating
conditions when measured over a 7 kHz channel bandwidth
centred on the first 8.33 lcHz adjacent channel shall not exceed
-45 dB below the transmitter carrier power. The above
adjacent channel power shall take into account the typical
voice spectrum.
Note.- The voice spectrum is assumed to be a constant
level between 300 and 800 Hz and attenuated by I0 dB per
octave above 800 Hz.
2.3.1.4 Modulation. A peak modulation factor of at least
0.85 shall be achievable.
2.3.1 -5 Recommendation.- Means should be provided
to mitztain the average modulation factor at the highest
practicable value without overmodulation.
2.2.2.4 Adjacent channel rejection. The receiving system
shall ensure an effective rejection of 60 d~ or more aihk next
assignable channel. 2.3.2 Receiving function
2.3.2.1 Frequency stability. Where 8.33 kHz channel
Note.- The next assignable frequency will n o m l l ~be spacing is introduced in accordance with Volume V, the radio
plus or minus 50 kHz. Where this channel spacing will not frequency of operation shall not vary more than plus or minus
sufJice, the next assignable frequency will be plus or minus 0.0005 per cent from the assigned frequency.
25 kHz, or plus or minus 8.33 kHz, implemented in accordance
with the provisions of Volume V It is recognized that
in certain areas of the world receivers designed for 25 kHz,
50 kHz or 100 kHz channel spacing may continue to be used. 2.3.2.2 SENSITIVITY
2.3.2.2.1 Recommendation.- Afer due allowance has
been made .for aircraft feeder mismatch, attenuation loss and
2.3 SYSTEM CHARACTERISTICS OF
THE: AIRBORNE INSTALLATION
2.3.1 Transmitting function
2.3.1.1 Frequency stability. The radio frequency of
operation shall not vary more than plus or minus 0.005 pcr
cent from the assigned frequency. Where 25 H z channel
spacing is introduced, the radio frequency of operation shall
not vary more than plus or minus 0.003 per cent from the
assigned frequency. Where 8.33 kHz channel spacing is
introduced, the radio frequency of operation shall not vary
more than plus or minus 0.0005 per cent from the assigned
frequency.
- -
antenna polar diagram variation, the sensitivity of the
receiving function should be such as to provide on a high
percentage of occasions an audio output signal with a - -
bantec~unwanted ratio of I 5 dB, with a 50 per cent amplitude
modulated (A3E) radio signal having a $eld strength of 75
microvolts per metre (minus 109 d~ w/m2).
Note.- For planning extended range VHF facilities, an
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