Ramsey Electronics PR40 Guia de Resolução de Problemas descarregar pdf (Página 3)

PR40—3

CIRCUIT DESCRIPTION

L1 and C2 form a tuned input filter for the preamp to reject out-of-band signals. The 3 db

bandwidth of this filter is 24MHz. L1 is adjustable for peak performance. The 2SC2498

transistor is a bipolar silicon NPN low noise UHF/VHF amplifier in a TO-92 case suitable for

service up to 5 Ghz, with maximum device dissipation of 600 milliwatts. Q1 has a very low

noise figure, determined by the bias established by R1 and R2. The actual circuit is about

as simple as they come. Maximum gain and freedom from oscillation are accomplished by

the quality of workmanship in parts installation and I/O connector wiring.

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Ramsey Electronics PR40 Guia de Resolução de Problemas Página 3