Gaas Fet Converter For 23 Cm Amateur Television

EE 45 988 GaAs FET CONVERTER FOR 23 CM AMATEUR TELEVISION The ultra-low noise figure of this SHF converter, in conjunction with its high conversion gain, enables it to outperform almost any combination of a 23 cm preamplifier and ATV converter based on bipolar transistors and a passive mixer respectively. Transmission and reception of fast-scan television is among the most exciting and technically interesting modes available to the licenced radio amateur with an in- terest in UHF and SHF design and con- struction. The 70 cm band (430 - 440 MHz) has long been popular for amplitude-modulated ATV with vestigial sideband suppression, but its use for ATV (a wideband mode) is now under considerable pressure owing to the rising demand for, frequency allocations for narrow-band and professional services (radar, mobile telephones, cellular radio). Forced to "move up", ATVers started to explore the 23 cm band, in which the frequency range allocated to ATV (1250 -1285 MHz) was found to o...