机译:HF、VHF 和 UHF 系统和技术
Green Mountain Radio Research (GMRR), Colchester, VT 05446 USA;
rovidence.org;
Broadcasting; communication; HF; high frequency; ionosphere; magnetic-resonance imaging; meteor burst; MOSFET; p-i-n diode; radar; receiver; RF heating; transmission-line transformer; troposphere; UHF; ultra-high frequency; VHF; very high frequency;