SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Busselton Perth Date: 4 November, 2025 T-index: 110 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 6.7 4.0 3.1 BFF%%. 00 01 7.1 4.4 3.3 BFFF%.. 01 02 7.5 4.6 3.5 AFFF%%. 02 03 7.9 4.8 3.6 AFFF%%. . 03 04 8.1 4.9 3.7 AFFFF%. . 04 05 8.3 4.9 3.6 AFFFF%% . 05 06 8.0 4.7 3.6 AFFF%%. . 06 07 7.8 4.5 3.5 AFFF%%. . 07 08 7.6 4.2 3.3 BFFF%%. 08 09 7.5 3.8 3.0 AFFFF%%. 09 10 7.3 3.0 2.5 AFFFF%.. 10 11 7.0 0.6 0.0 FFFFFF%%.. 11 12 6.6 0.6 0.0 FFFFFF%%. 12 13 6.0 0.6 0.0 FFFFF%%. 13 14 5.6 0.6 0.0 FFFFF%%. 14 15 5.4 0.6 0.0 FFFFF%.. 15 16 5.3 0.6 0.0 FFFFF%. 16 17 5.0 0.6 0.0 FFFF%%. 17 18 4.7 0.6 0.0 FFFF%.. 18 19 4.4 0.6 0.0 FFFF%. 19 20 4.2 0.6 0.0 FFFF%. 20 21 4.4 0.6 0.0 FFFF%. 21 22 5.2 2.3 1.9 AFFF%. 22 23 6.1 3.4 2.7 AFFF%.. 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) 4-Nov-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000