TM 1–1520–238–T–3
20–22
20–54 SIGNAL NAME:
DOP DISTANCE TO GO
MEMORY LOCATION: 000504
MEMORY DATA BIT(S):
15–12
(HEX)
CONDITION:
If third digit displayed on HOD is 0, 1, 2, or 3, and fourth digit is 0=0
If third digit displayed on HOD is 4, 5, 6, or 7, and fourth digit is 0=1
If third digit displayed on HOD is 0, 1, 2, or 3, and fourth digit is 1=2
If third digit displayed on HOD is 4, 5, 6, or 7, and fourth digit is 1=3
If third digit displayed on HOD is 0, 1, 2, or 3, and fourth digit is 2=4
If third digit displayed on HOD is 4, 5, 6, or 7, and fourth digit is 2=5
If third digit displayed on HOD is 0, 1, 2, or 3, and fourth digit is 3=6
If third digit displayed on HOD is 4, 5, 6, or 7, and fourth digit is 3=7
If third digit displayed on HOD is 0, 1, 2, or 3, and fourth digit is 4=8
If third digit displayed on HOD is 4, 5, 6, or 7, and fourth digit is 4=9
SIGNAL FUNCTION:
Indicates hundredths field.
REMARKS: From Doppler through CPG MRTU Type III to FCC.
PASS:
Location of fault if CONDITION agrees with distance to go: CPG MRTU Type III, wiring from
CPG MRTU Type III to Doppler, and Doppler. Troubleshoot wiring to isolate fault
(TM 9–1230–476–20–1).
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).
20–55 SIGNAL NAME:
DOP SINE TRUE HEADING
MEMORY LOCATION: 000505
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, and from
SIGNAL FUNCTION:
Indicates sine/status of Doppler.
REMARKS: From Doppler through CPG MRTU Type III to FCC.
PASS:
If CONDITION agrees with heading, go to paragraph 20–56.
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).
20–56 SIGNAL NAME:
DOP SINE TRUE HEADING
MEMORY LOCATION: 000505 AND 000506
MEMORY DATA BIT(S):
16–4 AND 19–18
(SCALAR)
CONDITION:
Monitor HOD; memory location response should indicate a positive from 0 to
180 degrees or a negative from 181 to 359 degrees.
SIGNAL FUNCTION:
Indicates Doppler sine true heading.
REMARKS: From Doppler through CPG MRTU Type III to FCC.
PASS:
If CONDITION agrees with heading, go to paragraph 20–57.
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).
