TM 1–1520–238–T–3
20–3
MULTIPLEX READ CODE INTERPRETATIONS
20–1 SIGNAL NAME:
DOP DRIFT VEL BCD 1 –999.9/ +999.9 KM/HR (–200/ +200)
MEMORY LOCATION: 000447
MEMORY DATA BIT(S):
19–18
(BINARY)
CONDITION:
If sixth digit displayed on HOD is 0, and fifth digit is 0, 1, 2, or 3=plus, north,
west, up,
If sixth digit displayed on HOD is 0, and fifth digit is 4, 5, 6, or 7=failure
warning
If sixth digit displayed on HOD is 1, and fifth digit is 0, 1, 2, or 3=no computed data and
no failure detected
If sixth digit displayed on HOD is 1, and fifth digit is 4, 5, 6, or 7=minus, south, east,
down, from
SIGNAL FUNCTION:
Indicates sign/status of Doppler.
REMARKS: From Doppler through CPG MRTU Type III to FCC.
PASS:
If CONDITION agrees with Doppler drift, go to paragraph 20–2.
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).
20–2 SIGNAL NAME:
DOP DRIFT VEL BCD 1
MEMORY LOCATION: 000447
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
SIGNAL FUNCTION:
Indicates hundreds field.
REMARKS: From Doppler through CPG MRTU Type III to FCC.
PASS:
If CONDITION agrees with drift velocity, go to paragraph 20–3.
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).
20–3 SIGNAL NAME:
DOP DRIFT VEL BCD 1
MEMORY LOCATION: 000447
MEMORY DATA BIT(S):
11–8
(HEX)
CONDITION:
If second digit displayed on HOD is 0 or 1, and third digit is 0 or 4=0
If second digit displayed on HOD is 2 or 3, and third digit is 0 or 4=1
If second digit displayed on HOD is 4 or 5, and third digit is 0 or 4=2
If second digit displayed on HOD is 6 or 7, and third digit is 0 or 4=3
If second digit displayed on HOD is 0 or 1, and third digit is 1 or 5=4
If second digit displayed on HOD is 2 or 3, and third digit is 1 or 5=5
If second digit displayed on HOD is 4 or 5, and third digit is 1 or 5=6
If second digit displayed on HOD is 6 or 7, and third digit is 1 or 5=7
If second digit displayed on HOD is 0 or 1, and third digit is 2 or 6=8
If second digit displayed on HOD is 2 or 3, and third digit is 2 or 6=9
SIGNAL FUNCTION:
Indicates tens field.
REMARKS: From Doppler through CPG MRTU Type III to FCC.
PASS:
If CONDITION agrees with drift velocity, go to paragraph 20–4.
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).
