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