TM 1–1520–238–T–320–1520–35 SIGNAL NAME:DOP DESIRED TRACK (–180/+180 DEGREES)MEMORY LOCATION: 000473MEMORY 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,toIf sixth digit displayed on HOD is 0, and fifth digit is 4, 5, 6, or 7=failure warningIf sixth digit displayed on HOD is 1, and fifth digit is 0, 1, 2, or 3=no computed data andno failure detectedIf sixth digit displayed on HOD is 1, and fifth digit is 4, 5, 6, or 7=minus, south, east,down, and fromSIGNAL FUNCTION:Indicates sine/status of Doppler.REMARKS: From Doppler through CPG MRTU Type III to FCC.PASS:If CONDITION agrees with track, go to paragraph 20–36.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).20–36 SIGNAL NAME:DOP DESIRED TRACKMEMORY LOCATION: 000473MEMORY DATA BIT(S):17–16(BINARY)CONDITION:If fifth digit displayed on HOD is 0 or 4=0If fifth digit displayed on HOD is 1 or 5=1If fifth digit displayed on HOD is 2 or 6=2If fifth digit displayed on HOD is 3 or 7=3SIGNAL FUNCTION:Indicates hundreds field.REMARKS: From Doppler through CPG MRTU Type III to FCC.PASS:If CONDITION agrees with track, go to paragraph 20–37.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).20–37 SIGNAL NAME:DOP DESIRED TRACKMEMORY LOCATION: 000473MEMORY DATA BIT(S):15–12(HEX)CONDITION:If third digit displayed on HOD is 0, 1, 2, or 3, and fourth digit is 0=0If third digit displayed on HOD is 4, 5, 6, or 7, and fourth digit is 0=1If third digit displayed on HOD is 0, 1, 2, or 3, and fourth digit is 1=2If third digit displayed on HOD is 4, 5, 6, or 7, and fourth digit is 1=3If third digit displayed on HOD is 0, 1, 2, or 3, and fourth digit is 2=4If third digit displayed on HOD is 4, 5, 6, or 7, and fourth digit is 2=5If third digit displayed on HOD is 0, 1, 2, or 3, and fourth digit is 3=6If third digit displayed on HOD is 4, 5, 6, or 7, and fourth digit is 3=7If third digit displayed on HOD is 0, 1, 2, or 3, and fourth digit is 4=8If third digit displayed on HOD is 4, 5, 6, or 7, and fourth digit is 4=9SIGNAL FUNCTION:Indicates tens field.REMARKS: From Doppler through CPG MRTU Type III to FCC.PASS:If CONDITION agrees with track, go to paragraph 20–38.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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