RECOMMENDATION ITU-R P.845-3 … HF FIELD-STRENGTH MEASUREMENT
ANNEX 1 … Measurement of sky-wave signal intensities at frequencies above 1.6 MHz
1 Introduction
2 Choice of circuits and periods of operation
3 Transmitter and transmitting antenna
4 Receiving antenna, receiver and recording techniques
5 Calibration measurements
6 Conversion of measured data to mean available receiver power and r.m.s. sky-wave field strength
    6.1 Mean available receiver power
    6.2 R.m.s. sky-wave field strength
    6.3 Preferred signal-intensity parameter for comparison of measured data with predictions
7 Data-tabulation procedures
    7.1 Circuit and operating details
    7.2 Monthly tabulation sheets of signal-amplitude measurements
    7.3 Tabulation of data for computer processing
ANNEX 2 … HF field-strength measurement technique ƒ Specifications for a field-strength measurement campaign intended for ...
1 Introduction
2 The HF field-strength measurement campaign
3 Transmitter
    3.1 Transmitter locations
    3.2 Transmitter power
    3.3 Transmitting antennas
    3.4 Frequencies and transmitter schedules
    3.5 The transmitted signal
    3.6 Log-keeping
4 Receiver
    4.1 Receiver locations
    4.2 Antennas and siting
    4.3 Receiver specifications and calibration
    4.4 Receiver measurement sequence
    4.5 Recording units and calibration
5 Signal and background noise measurement and data processing
    5.1 Sampling
    5.2 Input attenuation
    5.3 Data recording
    5.4 Determination of monthly medians and deciles
    5.5 Data normalization
6 Data handling, quality assurance and training
APPENDIX 1 … Specifications for a vertical antenna as a field probe for field-strength measurements
1 General outline
2 Geometrical structure
3 Amplifier of active antenna
    3.1 Basic schematic
    3.2 Electric characteristics of active antenna
4 Antenna cable
5 Lightning protection
APPENDIX 2 … Recording of signal and noise amplitudes and related information
1 Introduction
2 General data organization
3 Tables
    3.1 Receiver table
    3.2 Transmitter table
    3.3 Frequency table
4 File formats
    4.1 General description file
    4.2 Calibration file
    4.3 Measurements file (for each hour and circuit)
5 Diskettes organization
6 Storage considerations
7 Remarks
APPENDIX 3 … Rules for determining hourly median signal amplitudes