TM 1–1520–238–T–320–1120–24 SIGNAL NAME:DOP GROUND SPEEDMEMORY LOCATION: 000463MEMORY DATA BIT(S):11–8(HEX)CONDITION:If second digit displayed on HOD is 0 or 1, and third digit is 0 or 4=0If second digit displayed on HOD is 2 or 3, and third digit is 0 or 4=1If second digit displayed on HOD is 4 or 5, and third digit is 0 or 4=2If second digit displayed on HOD is 6 or 7, and third digit is 0 or 4=3If second digit displayed on HOD is 0 or 1, and third digit is 2 or 5=4If second digit displayed on HOD is 2 or 3, and third digit is 1 or 5=5If second digit displayed on HOD is 4 or 5, and third digit is 1 or 5=6If second digit displayed on HOD is 6 or 7, and third digit is 1 or 5=7If second digit displayed on HOD is 0 or 1, and third digit is 2 or 6=8If second digit displayed on HOD is 2 or 3, and third digit is 2 or 6=9SIGNAL FUNCTION:Indicates tens field.REMARKS: From Doppler through CPG MRTU Type III to FCC.PASS:IF CONDITION agrees with ground speed, go to paragraph 20–25.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).20–25 SIGNAL NAME:DOP GROUND SPEEDMEMORY LOCATION: 000463MEMORY 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 4, 5, 6, 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:Location of fault if CONDITION agrees with ground speed: CPG MRTU Type III, wiring fromCPG 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).20–26 SIGNAL NAME:DOP SINE PITCHMEMORY LOCATION: 000465MEMORY DATA BIT(S):18–17(BINARY))CONDITION:If fifth digit displayed on HOD is 0 or 1=plus, north, west, upIf 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 detected If fifthdigit displayed on HOD is 6 or 7=minus, south, east, down, fromSIGNAL 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 20–27.FAIL: Location of fault: RTA, wiring from RTA to Doppler, Doppler. Troubleshoot wiring to isolate fault(TM 11–1520–238–23–2).

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