Schematics > RF circuit > Band 2 Preamplifier
Band 2 PreamplifierDescription:
This is a VHF amplifier for the Band 2 Radio Spectrum tuning approximately 88 -
108 Mhz.
Band 2 Preamplifier circuit
Notes:
The circuit uses two 2N3819 FET's in cascode configuration. The lower FET
operates in common source mode, while the upper FET, operates in common gate,
realising full high frequency gain. The bottom FET is tunable allowing a peak
for a particular station. Coil details follow:
L1 4 turns of 18swg air spaced with a 1cm diameter, the tap is one turn up from
earth end...
L2 4 turns of 18swg air spaced with 1 cm diameter. The coupling coil is 1 turn
interwound from the supply end. Enamel coated wire must be used.
Title: Band 2 Preamplifier
Source: unknown
Published on: 2006-01-15
Reads: 933
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