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HF Transceiver - Frequency Synthesizer Block Diagram
Figure 010
R 1EFF : 051-099, 106-149, 201-299, 301-399, 1 23-11-00Page 37 1401-499, 1Aug 01/05 1 1 1CES 1 These two loops utilize reference signals of 9.9 KHz and 10 KHz from the frequency standard.
(f) ARINC 429 message decoder selection (Ref. Fig. 011) The RMP controls the various operations which are transmitted to the transceiver by a numeric message in compliance with ARINC
429.
This message can be received by the port A or the port B of the
transceiver. The RMP performs the selection by a discrete.
The message can be made up of one word of 32 Bits or two words of
32 bits for the 100 Hz channel spacings or CW mode.
A microprocessor performs the decoding of the frequency and mode
(AM or USB).
The microprocessor checks the message from the RMP and controls
the system operation.
In case of failure, it controls the illumination of the lights
located on the face and/or acts on the transmitter.
R **ON A/C 001-049, 101-105, 151-199,
(g) Test Correct operation of the transceiver and the associated couple can be checked by means of the BITE (See Para. 8). A summary of the result is displayed on the three LEDs on front of the transceiver.
1 LRU FAIL red light (LED)
_
Failure within transceiver.
2 COUPLER FAIL red light (LED)
_ COUPLER FAIL red light comes on when a failure is detected in antenna circuit, such as:
-coupler failure
-
excessive tuning time
-
excessive antenna reactance
-lock of system due to PTT activation of neighbour system in dual system installation.
3 CONTROL INPUT FAIL red light (LED)
_ CONTROL INPUT FAIL red light comes on when there are serial message faults on the frequency control inputs such as:
-absence of label
-insufficient refresh rate
-message not valid.
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HF Transceiver - Serial Frequency Control
Figure 011
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4_ TEST pushbutton switch
When pressing the TEST pushbutton switch, all the lights come
on and the Built- in Test is started. Result of the test is
displayed on the LEDs and available in the BITE system (Ref.
Para. 8).
B. HF Antenna Coupler (Ref. Fig. 012)
(1) Description Antenna Coupler FK 516 transforms the antenna impedance automatically into the 50 ohms output impedance of 400 W HF Transceiver XK 516 D1. Throughout the specified frequency range, the unit is able to tune grounded rod antennas as well as grounded wire antennas to a VSWR of typical not more than 1.3:1. Antenna Coupler FK 516 can be used in a single or dual system. In this system one antenna is operating with two transceivers. While one Antenna Coupler FK 516 is tuning or in the transmit mode, the other Antenna Coupler FK 516 is interlocked. Antenna Coupler FK 516 is a hermetically sealed unit pressurized with 50 kPa (overpressure: 150 kPa absolute). The unit is provided with three connectors for external connections:
-Antenna connector
-Coaxial N-type male connector for RF, control and DC inputs from 400 W HF Transceiver XK 516 D1.
-Chassis connector (26-contacts) for interlock functions with another Antenna Coupler FK 516, test functions and 115-V Power Supply. The unit is of modular design and consists of RF Unit A1 with Test Board A11, Modem A2, Directional Coupler A5, Tuning Control A3, Relay Board A4, Isolation Amplifier A6 and Power Board A7. Only one RF cable is required for the electrical connection of 400 W HF Transceiver XK 516 D1 and antenna coupler FK 516. This cable is used for the transfer of the RF transmitter and receiver signals, the antenna coupler FK 516 supply voltage and the antenna coupler FK 516 control information. Also possible is an additional ARINC 719 wiring. But in conjunction with the R&S 400 W HF Transceiver XK 516 D1 only the 115 V supply voltage is used. No controls or indicators are located on Antenna Coupler FK 516. All settings and status messages are transferred via the RF cable in the form of serial telegrams from 400 W HF Transceiver XK 516 D1, or via test interface X42 in the case of test operation. At both interfaces the transfer takes the form of ASCII telegrams which can be generated or displayed and evaluated by means of a suitable terminal or PC with terminal program for both interfaces.
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