SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Busselton Perth Date: 1 October, 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 5.9 3.5 2.7 AFF%%. 00 01 6.3 4.0 3.0 ABFF%. 01 02 6.6 4.3 3.1 BFF%%. 02 03 7.0 4.4 3.2 BFF%%. 03 04 7.2 4.5 3.3 BFFF%.. 04 05 7.3 4.5 3.3 BFFF%.. 05 06 7.0 4.4 3.2 BFF%%.. 06 07 6.7 4.2 3.1 BFF%%. 07 08 6.5 3.8 2.9 AFFF%%. 08 09 6.3 3.3 2.5 AFFF%.. 09 10 5.8 2.3 1.9 AFFF%%.. 10 11 5.0 0.5 0.0 FFFF%%.. 11 12 4.5 0.5 0.0 FFFF%%. 12 13 4.1 0.5 0.0 FFFF%.. 13 14 3.9 0.5 0.0 FFF%%. 14 15 3.9 0.5 0.0 FFF%%. 15 16 3.7 0.5 0.0 FFF%. 16 17 3.6 0.5 0.0 FFF%. 17 18 3.5 0.5 0.0 FFF%. 18 19 3.4 0.5 0.0 FFF%. 19 20 3.2 0.5 0.0 FFF%. 20 21 3.2 0.5 0.0 FFF%. 21 22 3.9 0.5 0.0 FFF%. 22 23 5.1 2.8 2.2 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) 1-Oct-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000