TM 1–1520–238–T–320–420–4 SIGNAL NAME:DOP DRIFT VEL BCD 1MEMORY LOCATION: 000447MEMORY DATA BIT(S):7–4(HEX)CONDITION:If first digit displayed on HOD is 0, and second digit is 0, 2, 4, or 6=0If first digit displayed on HOD is 1, and second digit is 0, 2, 4, or 6=1If first digit displayed on HOD is 2, and second digit is 0, 2, 4, or 6=2If first digit displayed on HOD is 3, and second digit is 0. 2. 4, or 6=3If first digit displayed on HOD is 4, and second digit is 0, 2, 4, or 6=4If first digit displayed on HOD is 5, and second digit is 0, 2, 4, or 6=5If first digit displayed on HOD is 6, and second digit is 0, 2, 4, or 6=6If first digit displayed on HOD is 7, and second digit is 0, 2, 4, or 6=7If first digit displayed on HOD is 0, and second digit is 1, 3, 5, or 7=8If first digit displayed on HOD is 1, and second digit is 1, 3, 5, or 7=9SIGNAL FUNCTION:Indicates ones field.REMARKS: From Doppler through CPG MRTU Type III to FCC.PASS:If CONDITION agrees with drift velocity, go to paragraph 20–5.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).20–5 SIGNAL NAME:DOP DRIFT VEL BCD 2MEMORY LOCATION: 000450MEMORY DATA BIT(S):19–16(HEX)CONDITION:If fifth digit displayed on HOD is 0, and sixth digit is 0=0If fifth digit displayed on HOD is 1, and sixth digit is 0=1If fifth digit displayed on HOD is 2, and sixth digit is 0=2If fifth digit displayed on HOD is 3, and sixth digit is 0=3If fifth digit displayed on HOD is 4, and sixth digit is 0=4If fifth digit displayed on HOD is 5, and sixth digit is 0=5If fifth digit displayed on HOD is 6, and sixth digit is 0=6If fifth digit displayed on HOD is 7, and sixth digit is 0=7If fifth digit displayed on HOD is 0, and sixth digit is 1=8If fifth digit displayed on HOD is 1, and sixth digit is 1=9SIGNAL FUNCTION:Indicates tenths field.REMARKS: From Doppler through CPG MRTU Type III to FCC.PASS:If CONDITION agrees with drift velocity, go to paragraph 20–6.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).20–6 SIGNAL NAME:DOP DRIFT VEL 1MEMORY LOCATION: 000451MEMORY DATA BIT(S):18–17(BINARY)CONDITION:If fifth digit displayed on HOD is 0 or 1=plus, north, west, up, If fifth digit displayed on HOD is 2 or 3=failure warningIf fifth digit displayed on HOD is 4 or 5=no computed data and no failure detectedIf fifth digit displayed on HOD is 6 or 7=minus, south, east, down, fromSIGNAL FUNCTION:Indicates sign/status of Doppler.REMARKS: From Doppler through CPG MRTU Type III to FCC.PASS:If CONDITION agrees with drift, go to paragraph 20–7.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).

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