SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Perth district Date: 8 July, 2026 T-index: 48 Bearings: 0 180 Distance: 0-300 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 60-90 1E 40-90 1 5 10 15 20 25 30 35 40 ** NONE ** UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 5.0 2.0 1.7 AFF%. 00 01 5.8 2.6 2.1 FFF%. 01 02 6.0 2.9 2.3 FFF%%. 02 03 6.1 3.0 2.4 BFFF%. 03 04 6.1 3.1 2.5 AFFF%. 04 05 6.2 3.1 2.5 AFFF%. 05 06 6.3 3.0 2.4 BFFF%. 06 07 6.4 2.8 2.2 FFFF%. 07 08 6.3 2.4 2.0 AFFFF%. 08 09 5.7 1.5 1.3 FFFF%. 09 10 4.4 0.4 0.0 FFFF%. 10 11 3.3 0.4 0.0 FFF%. 11 12 2.9 0.4 0.0 FF%. 12 13 2.9 0.4 0.0 FF%. 13 14 2.9 0.4 0.0 FF%. 14 15 2.9 0.4 0.0 FF%. 15 16 3.0 0.4 0.0 FF%. 16 17 3.0 0.4 0.0 FF%. 17 18 2.9 0.4 0.0 FF%. 18 19 2.9 0.4 0.0 FF%.. 19 20 2.9 0.4 0.0 FF%.. 20 21 2.7 0.4 0.0 FF%. 21 22 2.7 0.4 0.0 FF%. 22 23 3.7 0.4 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) 8-Jul-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000