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