RECOMMENDATION ITU-R BS.560-4 - Radio-frequency protection ratios in LF, MF and HF broadcasting
1 RF protection ratio in bands 5 (LF) and 6 (MF)
2 Relative RF protection ratio curves in bands 5 (LF), 6 (MF) and 7 (HF)
ANNEX 1
ANNEX 2 - Presentation of experimental results
ANNEX 3 - Protection ratios used in the LF, MF and HF broadcasting
1 Introduction
2 Audio-frequency protection ratio
3 RF protection ratio
4 General principle of non-subjective methods
5 RF protection ratios for ground-wave services
    5.1 Stable wanted and interfering signals (ground-wave signal interfered with by another ground-wave signal)
    5.2 Stable wanted and fluctuating interfering signal
    5.3 Long-term field-strength variations
6 RF protection ratios for sky-wave services
    6.1 Bands 5 (LF) and 6 (MF)
    6.2 Band 7 (HF)
7 Data available on protection ratios
8 Measurement results
9 Subjective assessment of the quality of reception
    9.1 Investigations carried out in the USSR
    9.2 Investigations carried out in Japan
10 RF protection ratios for synchronized broadcasting transmitters
    10.1 Investigations carried out in the USSR
    10.2 Investigations carried out within the EBU
    10.3 Investigations carried out within the OIRT
    10.4 Investigations carried out in the United Kingdom
    10.5 Investigations carried out in India
    10.6 Investigations carried out in Japan
    10.7 Investigations carried out in the People’s Republic of China
ANNEX 4 - Planning parameters in band 7 (HF) considered by the WARC HFBC-87
1 RF protection ratios
    1.1 Protection ratio for unsynchronized transmissions
    1.2 Protection ratio for synchronized transmissions
    1.3 Relative RF protection ratios
2 Minimum usable field strength
3 Signal fading allowance
    3.1 Short-term (within the hour) fading
    3.2 Long-term (day-to-day) fading
    3.3 Combined distribution of fading applicable to wanted and unwanted signals