Specifications
probe rf preamplifier is fed through
coupling capacitor C7901 and attenuating
resistor R7911 to the 5.65-mc amplifier.
The rectified output of the 5.65-mc am-
plifier is applied to the Schmitt trigger
circuit. If the signal voltage is above the
minimum limit, GREEN indicator DS7902
will light. If the signal voltage is below the
minimum limit, insufficient voltage will
be applied to the Schmitt trigger circuit,
and RED indicator D67901 will light. Op-
erating voltage for the 5.65-mc amplifier
and Schmitt trigger circuit is supplied
from the +16-voIt dc regulated line. Op-
erating voltage for the test probe rf pre-
amplifier is supplied from the +16-volt dc
regulated line through diode CR7403 and rf
choke L7501.
26. Selector Switch Positions 16 and 17
(D, fig. 10)
a. Position 16. When the selector
switch is in position 16, the 5.65-mc output
of module A3400 can be tested. The oper-
ation is similar to that of position 15 (para
25) except that R7913, which has a resis-
tance of 113 ohms, is used in place
of R7911.
b. Position 17. When the selector
switch is in position 17, the 5.65-mc output
of module A3500 or the 5.65-mc input to
module A3600 can be tested. The operation
is similar to that of position 15 (para 25)
except that R7914, which has a resistance
of 200 ohms, is used in place of R7911.
27. Selector Switch Position 18
(E, fig. 10)
When the selector switch is in position
18, the output of assembly A1000 can be
tested. The signal from the test probe rf
preamplifier is fed through coupling ca-
pacitor C7901 to the 47.0-mc amplifier.
The rectified output of the 47.0-mc ampli-
fier is applied to the Schmitt trigger
circuit. If the signal voltage is above the
minimum limit, GREEN indicator DS7902
will light. If the signal voltage is below the
minimum limit, insufficient voltage will be
applied to the Schmitt trigger circuit, and
RED indicator DS7901 will light. Operating
voltage for the 47.0-mc amplifier and
Schmitt trigger circuit is supplied from the
+16-volt dc regulated line. Operating volt-
age for the test probe rf preamplifier is
supplied from the +16-volt dc regulated
line through diode CR7401 and rf choke
L7501.
16