SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 22 July, 2026 T-index: 50 Bearings: 201 24 Distance: 1680 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 12-15 1E 2 1 5 10 15 20 25 30 35 40 2F 28-32 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 14.3 12.1 7.0 SSXMMM BBFF%%.... 9.2 7.6 4.2 00 01 15.7 14.1 8.0 ASSXXM MBBBF%%%.. .. 10.1 9.2 4.7 01 02 15.2 15.3 8.5 ASSSXM MMBBB%%%.. .. 10.2 10.0 5.0 02 03 14.8 16.0 8.8 SSSXX MMBBPP%%.. ... 10.0 10.5 5.2 03 04 14.0 16.2 8.9 SSSXX MBBPPP%... .. 9.4 10.7 5.3 04 05 13.9 16.0 8.9 SSSXX MBBPPP%... .. 9.3 10.6 5.2 05 06 13.5 15.4 8.6 ASSSXX MBBPP%%... . 9.1 10.2 5.0 06 07 13.6 14.3 8.0 ASSXXM MBBP%%%... .. 9.0 9.5 4.7 07 08 13.4 12.4 7.1 SSSXMM MBF%%%%... . 8.9 8.2 4.2 08 09 13.0 8.5 5.2 ASSMMMMM FF%%%%.... . 8.8 5.7 3.0 09 10 10.2 2.1 0.0 XMMMMMMMFF %%%.... 7.2 1.4 0.0 10 11 8.0 2.1 0.0 XMMMMMM%%% .... 5.6 1.4 0.0 11 12 7.0 2.1 0.0 XMMMMM%%%. ... 4.9 1.4 0.0 12 13 6.5 2.1 0.0 XMMMMF%%.. .. 4.6 1.4 0.0 13 14 6.2 2.1 0.0 XMMMMF%%.. . 4.6 1.4 0.0 14 15 6.0 2.1 0.0 XMMMM%%%.. . 4.6 1.4 0.0 15 16 6.1 2.1 0.0 XMMMMF%%.. . 4.6 1.4 0.0 16 17 5.9 2.1 0.0 XMMMM%%%.. . 4.5 1.4 0.0 17 18 5.4 2.1 0.0 XMMMM%%... . 4.1 1.4 0.0 18 19 5.1 2.1 0.0 XMMMM%%... . 3.8 1.4 0.0 19 20 4.7 2.1 0.0 XMMM%%%... 3.3 1.4 0.0 20 21 4.6 2.1 0.0 XMMM%%%... 3.3 1.4 0.0 21 22 5.6 2.1 0.0 XMMMM%%... 4.3 1.4 0.0 22 23 10.6 7.8 4.8 SMMMFFF %%... 6.7 3.3 3.2 23 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT =============================================================================== |. USABLE LESS THAN 50% OF DAYS |% USABLE 50% TO 90% OF DAYS | |B BOTH E and F MODES 90% OF DAYS |M MIXED FIRST AND SECOND F MODES | |F FIRST F MODE ONLY |E E-LAYER PROPAGATION |P 90% E and 50-90% F | |S SECOND MODES ONLY |A HIGH ABSORPTION |X COMPLEX MODES | (c) 22-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000