Policy on Intellectual Property Right (IPR)
Annex 1 Table of Contents
1 Introduction
PART 1 Frequency availability
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)
PART 2 Median sky-wave field strength
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
PART 3 The prediction of system performance
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