SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Busselton Perth Date: 23 July, 2026 T-index: 60 Bearings: 15 195 Distance: 196 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F/1E: Near 90 1 5 10 15 20 25 30 35 40 ** NONE ** UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 5.4 2.7 2.1 FFF%. 00 01 6.2 3.4 2.6 AFFF%. 01 02 6.5 3.8 2.8 AFFF%.. 02 03 6.8 4.1 2.9 ABFF%.. 03 04 6.8 4.1 3.0 ABFF%%. 04 05 6.9 4.1 3.0 ABFF%%. 05 06 6.9 4.0 2.9 ABFF%%. 06 07 7.0 3.7 2.7 AFFF%%. 07 08 6.9 3.2 2.4 BFFF%%. 08 09 6.3 2.2 1.8 AFFFF%. 09 10 5.0 0.5 0.0 FFFF%%. 10 11 3.9 0.5 0.0 FFF%.. 11 12 3.4 0.5 0.0 FFF%. 12 13 3.1 0.5 0.0 FFF.. 13 14 3.0 0.5 0.0 FF%.. 14 15 3.1 0.5 0.0 FFF.. 15 16 3.0 0.5 0.0 FF%.. 16 17 3.0 0.5 0.0 FF%.. 17 18 3.0 0.5 0.0 FF%.. 18 19 2.9 0.5 0.0 FF%.. 19 20 2.9 0.5 0.0 FF%.. 20 21 2.8 0.5 0.0 FF%. 21 22 2.8 0.5 0.0 FF%. 22 23 3.9 0.5 0.0 FFF%. 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) 23-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000