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Some useful or insightful data and quick reference tables about amateur radio like:

  • The distance of one hop propagation from layer F2

The distance of one hop propagation from layer F2

According to ITU-R P.533-8, assuming this angle will not penetrate layer F

foF2=12.0MHz, foE=3.0MHz, M3000=3.1, R12=100.0

Angle 7.0MHz(40m) 14.0MHz(20m) 21.0MHz(15m) 28.0MHz(10m)
0 2973 3079 3354 3684
5 2058 2167 2432 2752
10 1476 1604 1860 2172
15 1109 1275 1534 1849
20 873 1071 1335 1631
25 726 932 1184 1344
30 621 828 1081 1122
35 538 744 910 945
40 469 674 770 800
45 408 612 653 678
50 354 555 551 573
55 304 484 463 481
60 257 400 383 398
65 212 324 310 323
70 169 254 243 252
75 126 187 179 186
80 84 123 118 123
85 42 61 59 61

Author : AlanCui
This blog is under a CC BY-NC-SA 4.0 International License
Link to this article : https://alancui.cc/2026/07/16/some-hf-radio-related-data/

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