2304_MHz_PREAMP

Published:2009/6/24 23:40:00 Author:Jessie | From:SeekIC

Narrow-band stage using Fairchlld MT-2500 bipolar transistor gives gain of 6 to 9 dB and noise figure of 2.5 to 4.5 dB.Cavity resonators at both input and output give excellent frequency selectivity. Similar circuit can be used wi1h Fairchild MT-4500, FMT-4005, or equivalent newer stripline-type transistors.RFC1 is 3 turns and RFC2 is 5 turns, air-wound with No. 26 enamel by using No. 52 drill as mandrel. Coupling strips on base and collector of transistor are 0.25-mm brass shim stock. Article gives construction and tune-up details, along with altemate design for HP-35821E and HP-35862E transistors using coupling loops. 10K pot is used only during tune-up.-N. J. Foot, Nanow-Band Solid-State 2304-MHz Preampli-fiers, Ham Radio, July 1974, p 6-11.



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