SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Busselton Perth Date: 6 August, 2026 T-index: 70 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 5.8 2.9 2.3 FFF%.. 00 01 6.6 3.6 2.7 AFFF%.. 01 02 7.1 4.0 2.9 ABFFF%. 02 03 7.3 4.2 3.0 ABFFF%.. 03 04 7.3 4.3 3.1 BFFF%.. 04 05 7.4 4.2 3.1 BFFF%.. 05 06 7.4 4.1 3.0 ABFFF%.. 06 07 7.4 3.8 2.8 AFFFF%.. 07 08 7.2 3.4 2.5 AFFFF%.. 08 09 6.7 2.5 2.0 AFFFF%.. 09 10 5.6 0.6 0.0 FFFFF%.. 10 11 4.4 0.6 0.0 FFFF%.. 11 12 3.8 0.6 0.0 FFF%.. 12 13 3.5 0.6 0.0 FFF%. 13 14 3.3 0.6 0.0 FFF%. 14 15 3.2 0.6 0.0 FFF%. 15 16 3.2 0.6 0.0 FFF%. 16 17 3.1 0.6 0.0 FFF.. 17 18 3.1 0.6 0.0 FFF.. 18 19 3.0 0.6 0.0 FF%.. 19 20 3.0 0.6 0.0 FF%.. 20 21 2.9 0.6 0.0 FF%.. 21 22 2.9 0.6 0.0 FF%. 22 23 4.3 0.6 0.0 FFFF. 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) 6-Aug-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000