Figure 2. Amplifier, 11.6-mc, schematic diagram.
b. The 5.65-mc amplifier uses tran-
6. Amplifier, 5.65-Mc
sistor Q7701 in a common-base stage
which provides about 15-db gain.
T h e 5.65-mc amplifier is a single-
(1) The attenuated signal is coupled to
stage if. amplifier which has a gain of
the emitter of transistor Q7701
about 15 db. Power, input, and output con-
through capacitor C7701. The out-
nections are made to the 5.65-mc ampli-
put signal of Q7701 is developed
fier when selector switch S7902 is inposi-
across a tuned circuit consisting
tion 12, 15, 16, or 17. The output from the
of coil L7704 and capacitor C7704.
amplifier is rectified and fed to the Schmitt
Resistor R7707 reduces the Q of
trigger circuit.
the tuned circuit to obtain the
a. The input signal from the test probe
proper bandwidth.
rf preamplifier is fed to the input atten-
(2) Resistors R7705 and R7706 form a
uation pad consisting of resistors R7701,
voltage divider which provides the
R7702, and R7703. The pad reduces the rf
fixed-biasing portion of emitter-
s i g n a l level and isolates the 5.65-mc
b a s e bias for Q7701. Resistor
amplifier from the test probe rf preampli-
R7704 establishes the self-biasing
fier.
5
