SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Busselton Perth Date: 18 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 5.7 3.7 2.8 AFF%%. 00 01 6.1 4.1 3.0 ABFF%. 01 02 6.4 4.3 3.2 BFF%.. 02 03 6.7 4.5 3.3 BFF%%. 03 04 7.1 4.6 3.3 BFFF%.. 04 05 7.2 4.5 3.3 BFFF%.. 05 06 7.1 4.4 3.2 BFFF%.. 06 07 6.7 4.2 3.1 BFF%%. 07 08 6.5 3.9 2.9 AFFF%%. 08 09 6.4 3.5 2.6 AFFF%%. 09 10 5.9 2.6 2.1 FFF%%.. 10 11 5.3 0.5 0.0 FFFFF%%.. 11 12 4.9 0.5 0.0 FFFF%%.. 12 13 4.3 0.5 0.0 FFFF%.. 13 14 4.1 0.5 0.0 FFFF%. 14 15 4.1 0.5 0.0 FFFF%. 15 16 4.0 0.5 0.0 FFF%%. 16 17 3.8 0.5 0.0 FFF%.. 17 18 3.7 0.5 0.0 FFF%. 18 19 3.5 0.5 0.0 FFF%. 19 20 3.4 0.5 0.0 FFF%. 20 21 3.4 0.5 0.0 FFF%. 21 22 4.3 1.5 1.3 FFF%. 22 23 5.2 3.0 2.4 BFF%. 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) 18-Oct-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000