SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Bunbury Perth Date: 11 July, 2026 T-index: 60 Bearings: 8 188 Distance: 155 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 5.3 2.4 2.0 AFFF%. 00 01 6.2 3.1 2.4 BFFF%. 01 02 6.5 3.5 2.7 AFFF%.. 02 03 6.7 3.7 2.8 AFFF%.. 03 04 6.8 3.8 2.8 AFFF%%. 04 05 6.8 3.8 2.8 AFFF%%. 05 06 6.8 3.6 2.7 AFFF%%. 06 07 6.9 3.4 2.6 AFFF%%. 07 08 6.8 2.9 2.3 FFFF%.. 08 09 6.2 1.8 1.6 AFFFF%. 09 10 4.8 0.5 0.0 FFFF%.. 10 11 3.7 0.5 0.0 FFF%.. 11 12 3.2 0.5 0.0 FFF%. 12 13 3.0 0.5 0.0 FF%.. 13 14 2.9 0.5 0.0 FF%. 14 15 3.0 0.5 0.0 FF%. 15 16 3.0 0.5 0.0 FF%. 16 17 3.0 0.5 0.0 FF%. 17 18 3.0 0.5 0.0 FF%.. 18 19 2.9 0.5 0.0 FF%.. 19 20 2.9 0.5 0.0 FF%.. 20 21 2.8 0.5 0.0 FF%. 21 22 2.8 0.5 0.0 FF%. 22 23 3.8 0.5 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) 11-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000