TM 1–1520–238–T–3
20–23
20–57 SIGNAL NAME:
DOP BITE 1
MEMORY LOCATION: 000511
MEMORY DATA BIT(S):
19–4
(HEX)
CONDITION:
125252 should be displayed on HOD.
SIGNAL FUNCTION:
Monitors Doppler.
REMARKS: From Doppler through CPG MRTU Type III to FCC.
PASS:
If CONDITION has been met, go to paragraph 20–58.
FAIL: Location of fault: Doppler, wiring from Doppler to CPG MRTU Type III, CPG MRTU Type III.
Troubleshoot wiring to isolate fault (TM 11–1520–238–23–2).
20–58 SIGNAL NAME:
DOP BITE 2
MEMORY LOCATION: 000512
MEMORY DATA BIT(S):
19–4
(HEX)
CONDITION:
146314 should be displayed on HOD.
SIGNAL FUNCTION:
Monitors Doppler.
REMARKS: From Doppler through CPG MRTU Type III to FCC.
PASS:
If CONDITION has been met, go to paragraph 20–59.
FAIL: Location of fault: Doppler, wiring from Doppler to CPG MRTU Type III, CPG MRTU Type III.
Troubleshoot wiring to isolate fault (TM 11–1520–238–23–2).
20–59 SIGNAL NAME:
DOP BEARING TO DESTINATION
MEMORY LOCATION: 000513
MEMORY DATA BIT(S):
18–17
(BINARY)
CONDITION:
If fifth digit displayed on HOD is 2 or 3=failure warning
If fifth digit displayed on HOD is 4 or 5=no computed data and no failure detected
If fifth digit displayed on HOD is 6 or 7=minus, south, east, down, from
SIGNAL FUNCTION:
Indicates sine/status of Doppler.
REMARKS: From Doppler through CPG MRTU Type III to FCC.
PASS:
If CONDITION agrees with bearing, go to paragraph 20–60.
FAIL: Location of fault: Doppler, wiring from Doppler to CPG MRTU Type III, CPG MRTU Type III.
Troubleshoot wiring to isolate fault (TM 11–1520–238–23–2).
20–60 SIGNAL NAME:
DOP BEARING TO DESTINATION
MEMORY LOCATION: 000513 AND 000514
MEMORY DATA BIT(S):
16–4 AND 19–18
(SCALAR)
CONDITION:
(–180/+180 degrees)
SIGNAL FUNCTION:
Indicates bearing to destination
REMARKS: From Doppler through CPG MRTU Type III to FCC.
PASS:
Location of fault if CONDITION agrees with bearing, go to paragraph 20–61.
FAIL: Location of fault: Doppler, wiring from Doppler to CPG MRTU Type III, CPG MRTU Type III.
Troubleshoot wiring to isolate fault (TM 11–1520–238–23–2).
