SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Busselton Perth Date: 11 May, 2026 T-index: 55 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 6.1 2.8 2.2 FFFF%. 00 01 6.9 3.5 2.6 AFFF%%. 01 02 7.4 3.9 2.8 AFFFF%.. 02 03 7.5 4.1 2.9 ABFFF%%. 03 04 7.4 4.2 3.0 ABFFF%.. 04 05 7.4 4.1 3.0 ABFFF%.. 05 06 7.6 4.0 2.9 ABFFF%%. 06 07 7.8 3.7 2.7 AFFFF%%. 07 08 7.6 3.3 2.4 BFFFF%.. 08 09 6.9 2.4 1.9 AFFFF%%. 09 10 5.4 0.5 0.0 FFFFF%.. 10 11 4.2 0.5 0.0 FFFF%.. 11 12 3.6 0.5 0.0 FFF%.. 12 13 3.3 0.5 0.0 FFF%. 13 14 3.3 0.5 0.0 FFF%. 14 15 3.3 0.5 0.0 FFF%. 15 16 3.3 0.5 0.0 FFF%. 16 17 3.3 0.5 0.0 FFF%. 17 18 3.2 0.5 0.0 FFF%. 18 19 3.2 0.5 0.0 FFF%. 19 20 3.2 0.5 0.0 FFF%. 20 21 3.0 0.5 0.0 FF%.. 21 22 3.0 0.5 0.0 FF%. 22 23 4.5 0.5 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) 11-May-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000