VHF UTILITY DX OCTOBER 1973 My loggings. Hallicrafters SX-62 with International Crystal SAX-1 pre- amps, Allied A-2586, 30-ft indoor random-wire antenna; Es unless noted * F2, ** F2 backscatter; daily peak Latin American F2 MUF noted if 35 MHz or more; new underlined, CST used;solar noise matching SESC report 8-15: 0947, KMA 829 24: 1652, KSJ 815 3: 1932, KLF 527 * 1130, KSC 645 1704, KQC 884 4: 1525, 36.5 * 1212, L Beach 2035, KME 438 1557, KMA 829 ** 1319, KQC 877 2047, L Beach 5: 1534, KMA 829 ** 16: 1140, KMA 829 2053, KMA 829 38.7 * 17: 1110, KMA 829 25: 2117, KMA 829 9: 1726, KKV 690 ** 1802, L Beach 2119, KQC 884 1743, 42.2 * 20: 1041, Madison 2121, KQC 877 1819, KMA 829 ** 1101, KSC 645 2127, KQD 607 1823, KLR 503 * 1104, KDN 402 2131, KSC 645 1828, KCE 681 * 1310, KAA 971 31: 1310, 36.8 * 10: 1540, 47.7 * 21: 1325, OK City 9-1: 1500, 36.3 * 1643, KLF 527 * 1358, KDN 402 2: 1505, 36.9 * 1658, KKV 690 ** 22: 0937, KDN 402 3: 1327, sol. noise 1700, KMA 829 ** 23: 1806, KLF 527 * 1721, sol. noise 1720, KFL 943 ** 24: 1107, KQD 313 1730, KKV 690 ** 11: 1705, 40.9 * 1114, KSC 645 1739, OK City ** 1744, KMA 829 ** 1132, KQD 607 1740, 37.4 * 1803, KKV 690 ** 1530, KIQ 999 1913, KFL 943 ** 12: 1545, 44.6 * ------------------------------------------------------------------------ KAA 971 42.5- Storm Lake, IA-sp KQC 877 35 - Cincinnati, OH KCE 681 33.70 Rockland, ME-f KQC 884 35 - Detroit, MI KDN 402 35.54 Omaha, NE KQD 313 35.50 Dayton, OH KFL 943 35.58 Las Vegas, NM ** KQD 607 35.50 Grand Rapids, MI KIQ 999 35.34 Mobile, AL KSC 645 35.58 Chicago, IL KKV 690 35.62 Houston, TX KSJ 815 35.22 Fort Wayne, IN KLF 527 35.22 Honolulu, HI ** - 35.58 Long Beach, CA * KLR 503 33.02 Boston, MA-h - 35.42 Madison, WI-mp KMA 829 35.58 San Diego, CA - 35.58 OK City, OK * KME 438 35.22 Orange, CA (KAA 973 42.58 Fairfield, IA-sp) f-fire; mp-mobile phone; h-hospital;sp-state police; rest are pagers tone except * voice, ** tone message with voice ID ------------------------------------------------------------------------ As this column is the only one in the VUD that encounters any great amount of F2 DX, some explanation of that layer and its behavior is felt in order. These will be fitted into the column as space permits. As far as VHF is concerned, the most striking trait of F2 is that it is a daytime phenomena (though sometimes may peak in late afternoon or early evening with a magnetic storm onset). The difference in day and night ionograms show this best in the figure.
At night the F1 and F2 layers effectively merge. (For figure nota-
tions see Dec 1972 VUD, p. 6). Unlike the other lower layers it does not
almost completely disappear. This is due to the comparatively low part-
icle density at F2 heights (on the order of one ten-billionth to one
trillionth that of sea level) with the fewer free electron collisions
slowing recombination.
-to be continued-
73,
WA5IYX