Ramsey Electronics FM10C, Руководство пользователя

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FM10A 6
RF Oscillator
This oscillator consists of U1, C19, C20, L4, and C18. The setting of L4 and
the value of C18 sets the RF Carrier frequency that is received by a standard
FM radio.
RF Amp
C22 is a coupling capacitor that allows the RF output at U1 pin 7 to be passed
to the transistor Q1. R11 sets the bias or operating point of Q1. R12 is the
collector load resistor that develops the output signal and brings in DC power.
RF Output
C23 couples the RF output signal to the on-board whip antenna if used (not
used if external output jack is used.
C24 couples the RF signal to the RF output jack J4. L5 clamps the DC level
from the antenna to the ground plane of the circuit board. R13 helps prevent
static discharges from damaging the RF amp.