SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Busselton Perth Date: 9 July, 2025 T-index: 80 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 2.7 2.1 FFF%. 00 01 6.8 3.5 2.6 AFFF%.. 01 02 7.3 3.9 2.8 AFFFF%. 02 03 7.6 4.1 3.0 ABFFF%.. 03 04 7.6 4.2 3.0 ABFFF%.. 04 05 7.7 4.2 3.0 ABFFF%.. 05 06 7.6 4.0 2.9 ABFFF%.. 06 07 7.7 3.7 2.8 AFFFF%.. 07 08 7.5 3.2 2.4 BFFFF%.. 08 09 6.9 2.0 1.6 AFFFF%%. 09 10 5.5 0.6 0.0 FFFFF%.. 10 11 4.2 0.6 0.0 FFFF%. 11 12 3.6 0.6 0.0 FFF%.. 12 13 3.3 0.6 0.0 FFF%. 13 14 3.1 0.6 0.0 FFF.. 14 15 3.1 0.6 0.0 FFF.. 15 16 3.1 0.6 0.0 FFF.. 16 17 3.1 0.6 0.0 FFF.. 17 18 3.0 0.6 0.0 FF%.. 18 19 3.1 0.6 0.0 FFF.. 19 20 3.1 0.6 0.0 FFF%. 20 21 3.0 0.6 0.0 FF%.. 21 22 2.9 0.6 0.0 FF%. 22 23 4.0 0.6 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) 9-Jul-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000