Policy
on Intellectual Property Right (IPR)
Annex 1 Table of Contents
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
9 000 km
5.2.1 Modes considered
5.2.2 Field strength determination
5.3 Paths longer
than 7 000 km
5.3.1 Determination of the fM
5.3.2 Determination of the fL
5.3.3 Estimation of the field strength Etl
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
Attachment 1 to Annex 1 A model for equatorial
scattering of HF signals