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TM 11-5820-695-35
2-64.1 Functioning of Relay Assembly 1A15A18
Relay assembly 1A15A18 monitors summary alarm
a. Operating voltage (+28 Vdc from 1A15TB3-13)
signals from Transmitter, Radio T-1054(P)A/GRC-
is applied to relays K1, K2 and K3 through 1A15A18E1.
144(V), Receiver, Radio R-1467 (P) A/GRC-144 (V) and
The status of the monitored signals at 1A15A18E2, E5
Converter-Multiplier Assembly CV-3633/GRC-144 (V) .
and Ell then determines whether a relay is energized or
The summary alarm signals are applied to relays
not. The sources of these signals are indicated in the
1A15A18K1, K2 and K3 and output signals from these
figures.  Refer to paragraph 2-87 for the signal at
relays are routed to the OCU and to alarm monitor
3A7J2-C in figure 2-35. The chart below lists the three
circuits in orderwire assembly 1A13.  Relay 1A18K4
inputs and shows the corresponding status of each relay
monitors status signals from the waveguide switches.
for normal and for fault condition.  The relay output
Output signals from K4 are routed to WAVEGUIDE SW
signal are routed to the OCU and to orderwire assembly
indicator at meter panel 1A15A8. The input connectors
k13. The chart shows output signal status for normal
are shown in figure 2-29 for AN/GRC-144(V) 3 and in
and fault conditions and signal routing. Chart data is
figures 2-30 and 2-31 for AN/GRC-144(V)4. These are
applicable to both AN/GRC-144(V) 3 and AN/GRC-
simplified  schematic  diagrams;  for  the  complete
144(V)4, except for relay K1.  In AN/GRC-144(V)3,
schematic diagram of relay assembly 1A15A18 see
there is no input at 1A15A18E2, K1 is always
figure 5-15.1 (sheet 1).
deenergized and the output signals at 1A15A18E3 is
always open circuit.
Relay Assembly 1A15A18 Alarm Signal Data
Change 6
2-108.1


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