TM 11591522613
CHAPTER 5
FUNCTIONING OF EQUIPMENT
is grounded. A standard power supply capaci-
5-1. General
tor input PI network filter circuit is used to de-
crease ripple present in the input, Zener diode
The F-1461/VRC is a powerline ripple filter in-
CR1 acts to clip voltage transients at 36 V dc
tended for use with Intercommunications Con-
+2 volts. Circuit breaker CB1 protects the cir-
trol Sets C-2297/VRC and C-2298/VRC as part
cuit at 1 ampere. Power indicator lamp DS1
of Intercommunication Set AN/VIC-1. Typical
lights when power is present at the input side of
uses are for tracked vehicle installation when
F-1461/VRC. Filtered output power of +25.5
audio and power cabling is routed through tur-
V dc +0 -15 V dc is presented at pin C of J71
ret sliprings. In addition to power line filtering
OUT.
of 25.5 V dc between AM-1780/VRC and
C-2297/VRC or C-2298/VRC it provides inter-
b. Pins B. D, E, F, H. J through N. P. and
connection facilities of signal/control circuits
between these units.
R through V of J72 IN carry signal and control
voltages from AM-1780/VRC through the tur-
5-2. Schematic Analysis
ret sliprings to respective pins of J71 OUT of
F-1461/VRC for connection to C-2297/VRC or
C-2298/VRC.
a. Input power of +25.5 V dc vehicular
source, is applied to pin C of J72 IN; terminal A
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