TM 1–1520–238–T–3
20–27
20–69 SIGNAL NAME:
DOP LATITUDE VEL
MEMORY LOCATION: 000521 AND 00522
MEMORY DATA BIT(S):
16–4 AND 19–18
(SCALAR)
CONDITION:
Monitor HOD; digits 6, 5, 4, 3 and 2 should read 0.
SIGNAL FUNCTION:
Indicates Doppler latitude velocity.
REMARKS: From Doppler through CPG MRTU Type III to FCC.
PASS:
If CONDITION agrees with latitude velocity go to paragraph 20–70.
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).
20–70 SIGNAL NAME:
DOP 100 KM SQUARE
MEMORY LOCATION: 000523
MEMORY DATA BIT(S):
17–11 AND 10–4
(ASCII)
CONDITION:
Refer to Table 20–1 for ASCII code conversions.
SIGNAL FUNCTION:
Indicates Doppler 100 km square
REMARKS: From Doppler through CPG MRTU Type III to FCC.
PASS:
Location of fault if condition is met: go to paragraph 20–71.
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).
20–71 SIGNAL NAME:
DOP LONGITUDE VEL
MEMORY LOCATION: 000525
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 longitude velocity, go to paragraph 20–72.
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).
20–72 SIGNAL NAME:
DOP LONGITUDE VEL
MEMORY LOCATION: 000525 AND 000526
MEMORY DATA BIT(S):
16–4 AND 19–18
(SCALAR)
CONDITION:
Monitor HOD, digits 6, 5, 4, 3 and 2 should read 0
SIGNAL FUNCTION:
Indicates Doppler longitude velocity.
REMARKS: From Doppler through CPG MRTU Type III to FCC.
PASS:
If CONDITION agrees with longitude velocity, go to paragraph 20–73.
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).
