Policy on Intellectual Property Right (IPR)
Annex 1
�1���� Introduction
�2���� Location of control points
�3���� Basic and operational maximum usable
frequencies
������� 3.1���� Basic maximum usable frequencies
������� 3.2���� E-layer critical frequency (foE)
������� 3.3���� E-layer basic MUF
������� 3.4���� F2-layer characteristics
������� 3.5���� F2-layer basic MUF
����������������� 3.5.1���� Lowest-order mode
����������������� 3.5.2���� Higher-order modes
(paths up to 9 000 km)
������� 3.6���� Within the month probability of
ionospheric propagation support
������� 3.7���� The path operational MUF
�4���� E-layer maximum screening frequency ( fs)
�5���� Median sky-wave field strength
������� 5.1���� Elevation angle
������� 5.2� ���Paths up to 7 000 km
����������������� 5.2.1���� Modes considered
����������������� 5.2.2 �����Field strength
determination
������� 5.3���� Paths longer than 9 000 km
������� 5.4���� Paths between 7 000 and
9 000 km
�6���� Median available receiver power
�7���� Monthly median signal-to-noise ratio
�8���� Sky-wave field strength, available
receiver signal power and signal-to‑noise ratios for other percentages of
time
�9���� Lowest usable frequency (LUF)
10���� Basic circuit reliability (BCR)
������ 10.1���� The reliability of analogue
modulated systems
������ 10.2���� The reliability of digitally
modulated systems, taking account of the time and frequency spreading of the
received signal
����������������� 10.2.1���� System parameters
����������������� 10.2.2���� Time delay
����������������� 10.2.3���� Reliability
prediction procedure
For path lengths up to 9 000 km:
For path lengths beyond 9 000 km:
������ 10.3���� Equatorial scattering
Appendix 1 to Annex 1� A model for equatorial scattering of HF signals