Specifications

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. Operat-
ing voltages are supplied to the 11.5-mc
amplifier and Schmitt trigger circuit from
the +16-volt dc regulated line. Operating
voltage is supplied to the test probe rf
preamplifier from the +16-volt dc reg-
ulated line through diode CR7402 and rf
choke L7501.
18. Selector Switch Position 8
(A, fig. 10)
When the selector switch is in position
8, a. +12-volt dc point on assembly A8000
can be tested. The tested voltage is con-
nected through rf choke L7301 to
the voltage supply limits sensing circuit.
The output from the voltage supply limb
sensing circuit is applied to the Schmitt
trigger circuit. If the tested voltage is
within limits, GREEN indicator DS7902
will light. If the tested voltage is not be-
tween minimum and maximum limits, in-
sufficient voltage will be applied to the
Schmitt trigger circuit, and RED indicator
DS7901 will light. Operating voltages are
supplied to the voltage supply limits
sensing and Schmitt trigger circuits from
the +16-volt dc regulated line.
19. Selector Switch Position 9
(D, fig. 9)
When the selector switch is in position 9,
the ll.5-mc output of module A8100 can
be tested. The operation is similar to
that of position 7 (para 17) except that
resistor R7908, which has a resistance
of 475 ohms, is used in place of R7907.
20. Selector Switch Position 10
(c, fig. 9)
When the selector switch is in position
10, the audio input to module A5100 can
be tested. The operation is similar to that
of position 3 (para 15) except that R7903
is not used (shorted).
21. Selector Switch Position 11
(c, fig. 9)
When the selector switch is in position
11, the high-level audio output from module
A5100 can be tested. The operation is sim-
ilar to that of position 3 (para 15) except
-
that resistor R7909, which has a resis-
tance of 243K, is used in place of R7903.
22. Selector Switch Position 12
(C, fig. 10)
When the selector switch is in position
12, the 5.65-mc output of module A3500
can be tested. The signal from the test
probe rf preamplifier is fed through
coupling capacitor C7901 and 5.65-mc
filter FL7501 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 DS7901 will light.
Operating voltage for the 5.65-mc ampli-
fier and Schmitt trigger circuit is supplied
from the +16-volt de regulated line. Oper-
ating voltage for the test probe rf pream-
plifier is supplied from the +16-volt dc
regulated line through diode CR7403 and rf
choke L7501.
23. Selector Switch Position 13
(D, fig. 9)
When the selector l switch is in position
13, the limited 11.5-mc output of module
A4200 can be tested. The operation is
similar to that of position 7 (para 17)
except that resistor R7901, which has a
resistance of 845 ohms, is used in place of
R7907.
24. Selector Switch Position 14
(D, fig. 9)
When the selector switch is in position
14, the output of module A3100 can be
tested. The operation is similar to that of
position 7 (para 17) except that R7907 is
not used (shorted).
25. Selector Switch Position 15
(D, fig. 10)
When the selector switch is in position
15, the 5.65-mc output of module A3500
can be tested. The signal from the test
14