(b)
Only with NDB stations modulated in A1 mode (in automatic or manual mode) it is necessary to select the BFO function on the MCDU in order to hear clearly its Morse identification signal.
(c)
In emergency mode, the BFO function is selected on the RMP when :
-
you push the STBY NAV/ADF pushbutton switch
-
you push the STBY NAV/BFO pushbutton switch.
(d)
It is possible to select the broadcast station on the RMP and the MCDU (manual mode only). In this case, the BFO selection is not necessary.
(e)
With the ATIS message trasmission by the NDB station, with the BFO active : it is necessary to push the ON VOICE pushbutton switch on one ACP in order to hear clearly this information without Morse signal.
D. Warning
**ON A/C 001-049, 051-099, 101-105, 151-199,
(Ref. Fig. 004)
R **ON A/C 106-149, 201-299, 301-399, 401-499,
(Ref. Fig. 004A)
**ON A/C ALL
The warnings related to the ADF are only the local warnings shown on the
NDs.
The warnings are detected by the BITE function of the receiver.
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4. Power Supply
____________
**ON A/C 001-004, 051-060,
(Ref. Fig. 002) R **ON A/C 106-149, 201-299, 301-399, 401-499,
(Ref. Fig. 002A)
**ON A/C 001-049, 051-099, 101-105, 151-199,
Post SB 34-1147 For A/C 001-004,051-060,
(Ref. Fig. 002B)
**ON A/C ALL
Energization of the system is through 115VAC 400 Hz buses :
-115VAC SHED ESS BUS 801XP via circuit breaker 1RP1
-115VAC BUS 2 202XP via circuit breaker 1RP2 R **ON A/C 106-149, 201-299, 301-399, 401-499,
The 115VAC ESS BUS 401XP energizes the VOR/ADF/DME RMI via circuit breaker 12FN.
**ON A/C ALL
5. Component Description
_____________________
**ON A/C 001-049, 101-105, 151-199,
A. ADF Receiver
(1) Characteristics
-Frequency range : 150 to 1799 KHz in 0.5 KHz steps
-Electrical power supply: 115VAC, 400 Hz, 30 watts
-Tuning accuracy: selected frequency plus or minus 250 Hz
-ADF accuracy: plus or minus 2 deg.
-Sensivity: 30 % modulation
1EFF : ALL 1 34-53-00Page 16 1 1 Aug 01/05 1 1 1CES 1
-ADF mode: 50 microV/m field strength at 400 Hz for 6 dB signal to noise ratio.
(2) External description (Ref. Fig. 005) The face of the receiver is fitted with a handle, two attaching parts, two momentary pushbutton switches and a front panel Liquid Crystal Display (LCD). The LCD is used as a fault display and as an operator interface during certain modes. The front panel display also provides user interfaces for test and troubleshooting. The front panel contains two momentary pushbutton switches for interfacing with the LCD pages. An RS-232 maintenace access port is provided on the front panel. This port is compatible with RS-232 serial ports on Personal Computers (PC). The back is equipped with one ARINC 600 size one connector, which includes three plugs:
-Top Plug (TP): is not used
-Middle Plug (MP): used for aircraft connections ts
-Bottom Plug (BP): used for input power.
(a) Not Applicable
R **ON A/C 051-051, 053-099, 106-149, 201-299, 301-399, 401-499,
A. ADF Receiver
(1)
Characteristics
-Frequency range : 190 to 1799 KHz in 0.5 KHz steps
-Electrical power supply: 115VAC, 400 Hz, 45 VA
-Tuning accuracy: selected frequency plus or minus 250 Hz
-ADF accuracy: plus or minus 2 deg.
-Sensivity: 30 % modulation
-ADF mode: 50 microV/m field strength at 400 Hz for 6 dB signal to noise ratio.
(2)
External description The ADF receiver conforms with the ARINC specification 600. The case size is 2MCU.
(a) Receiver face (Ref. Fig. 005A) The face of the receiver is fitted with a handle, one lug, a TEST pushbutton switch and two LEDs. The name, color and function of the two LEDs are as follows:
R 1EFF : 001-049, 051-051, 053-099, 101-149, 1 34-53-00Page 17 1151-199, 201-299, 301-399, 401-499, 1Aug 01/05 1 1 1CES 1
ADF - Receiver Figure 005 (SHEET 1)
R 1EFF : 001-049, 101-105, 151-199, 1 34-53-00Page 18 1 1 May 01/05 1 1 1CES 1
ADF - Receiver Figure 005 (SHEET 2)
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ADF - Receiver
Figure 005A
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