SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 3 August, 2026 T-index: 70 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 28-33 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 15.4 12.8 7.4 ASSXMM MBFFF%%%.. . 9.7 8.1 4.5 00 01 17.1 14.7 8.4 ASSSXM MMBBFFF%%% .... 10.8 9.6 5.0 01 02 17.0 15.9 9.0 SSSXX MMMBBF%%%% ..... 11.1 10.4 5.3 02 03 16.9 16.6 9.3 ASSSX MMMBBB%%%% ..... 11.1 10.9 5.5 03 04 16.0 16.8 9.4 ASSSX XMBBBP%%%. .... 10.5 11.1 5.5 04 05 15.8 16.6 9.3 SSSSX MMBBBP%%%. .... 10.3 11.0 5.4 05 06 15.3 16.0 9.0 SSSXX MMBBBP%%.. ... 10.1 10.6 5.3 06 07 15.1 14.9 8.5 ASSSXM MMBBF%%%.. ... 9.9 9.9 4.9 07 08 14.9 13.0 7.6 SSSXMM MMBF%%%%.. ... 9.8 8.7 4.4 08 09 14.8 9.4 5.8 SSXMMMM MFFF%%%%.. ... 9.8 6.3 3.3 09 10 11.9 2.3 0.0 XMMMMMMMMM F%%%%..... 8.2 1.5 0.0 10 11 9.2 2.3 0.0 XMMMMMMMF% %%..... 6.5 1.5 0.0 11 12 7.9 2.3 0.0 XMMMMMM%%% ..... 5.6 1.5 0.0 12 13 7.2 2.3 0.0 XMMMMMF%%. .... 5.1 1.5 0.0 13 14 6.8 2.3 0.0 XMMMMM%%%. ... 5.0 1.5 0.0 14 15 6.5 2.3 0.0 XMMMMM%%%. .. 4.8 1.5 0.0 15 16 6.4 2.3 0.0 XMMMMM%%.. .. 4.7 1.5 0.0 16 17 6.2 2.3 0.0 XMMMMF%%.. .. 4.7 1.5 0.0 17 18 5.9 2.3 0.0 XMMMMM%%.. .. 4.5 1.5 0.0 18 19 5.7 2.3 0.0 XMMMM%%%.. .. 4.2 1.5 0.0 19 20 5.1 2.3 0.0 XMMMM%%... . 3.7 1.5 0.0 20 21 4.8 2.3 0.0 XMMMM%%... 3.6 1.5 0.0 21 22 5.9 2.3 0.0 XMMMM%%... 4.4 1.5 0.0 22 23 11.8 8.8 5.4 ASMMMFF F%%%.. 7.3 4.6 3.5 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) 3-Aug-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000