HF Antenna Coupler Figure 012 
R 1EFF : 1 1 1CES  001-049, 101-105, 151-199,  1 111 23-11-00 Page 41 May 01/05

 Antenna Coupler FK 516 provides up to 1500 presettable intelligent RF channels (learn mode). If a known frequency is called up, Antenna Coupler FK 516 locks in to the frequency within 20 ms. A new frequency is locked and learned within 1 s (typical value : < 7 s maximum).
 (a)
 Not Applicable

 (b)
 Not Applicable

R **ON A/C 051-099, 106-149, 201-299, 301-399, 401-499,
 (g) Test Correct operation of the transceiver can be checked by means of the various lights on its face.
 1 LRU FAIL red light (LED)
_ LRU FAIL red light comes on in the event of a transceiver warning such as: - output power drop
 -microprocessor failure
 -synthesizer failure.
 2 KEY INTERLOCK red light (LED)
_ KEY INTERLOCK red light comes on when a failure is detected in antenna circuit, such as:
 -coupler failure
 -
excessive tuning time

 -
excessive antenna reactance.

 3 CONTROL INPUT FAIL red light (LED)
_ CONTROL INPUT FAIL red light comes on when there are serial message faults such as:
 -abscence of label
 -insufficient refresh rate
 -message not valid.
 4 SQL/LAMP TEST pushbutton switch
_ When pressing the SQL/LAMP TEST pushbutton switch, all the lights come on, the squelch is disabled and causes background noise to be heard in the headset.
 1EFF : ALL 1 23-11-00Page 42 1 1 Aug 01/05 1 1 1CES 1 B. HF Antenna Coupler

 (1) Description The antenna coupler enables matching of the aircraft HF shunt-type antenna with the output circuit (50 ohms) of the HF transceiver. The coupler is a pressurized sealed box.
 (a)
 The face features:
 (Ref. Fig. 012A)

 -
a connector J1 for connection with the transmitter

 -
a coaxial connector J2 to connect the coaxial cable from the transmitter

 -
a connector J3 for test equipment connection

 -
a pressurizing valve

 -
a handle

 -an identification plate.

 (b)
 The back carries:

 -a connector providing connection between the coupler and the antenna.
 **ON A/C 001-049, 101-105, 151-199,
 (2) Operation

R **ON A/C 051-099, 106-149, 201-299, 301-399, 401-499,
 (2) Operation (Ref. Fig. 013A, 014, 015, 016) The coupler is tuned in six sequences: start, reception/standby, tune A, tune B, tune C and operational position. A sequence counter controls the six sequences. The counter starts the next sequence only when all the conditions related to the previous one are satisfied. If a failure is detected during the tuning phase, tuning is stopped. The tuning phase is initiated at HF system energization or when a new frequency is selected. The tune control line is then grounded. Servomotors controlled by servo-amplifiers place the tuning elements in start position.
 (a) Start sequence In this sequence capacitors C2, C3 and inductor L2 are positioned so that they present minimum impedance to signals. In addition, switch S4 disconnects inductor L2 from the circuit.
 1EFF : ALL 1 23-11-00Page 43 1 1 Aug 01/05 1 1 1CES 1

 HF Antenna Coupler
 Figure 012A

R 1EFF : 051-099, 106-149, 201-299, 301-399, 1 23-11-00Page 44 1401-499, 1Aug 01/05 1 1 1CES 1

 HF Antenna Coupler Operation - Block Diagram
 Figure 013

R 1EFF : 001-049, 101-105, 151-199, 1 23-11-00Page 45 1 1 May 01/05 1 1 1CES 1

 HF Antenna Coupler Operation - Block Diagram
 Figure 013A

R 1EFF : 051-099, 106-149, 201-299, 301-399, 1 23-11-00Page 46 1401-499, 1Aug 01/05 1 1 1CES 1

 HF Antenna Coupler - Flow Diagram (Sheet 1/3)
 Figure 014

R 1EFF : 051-099, 106-149, 201-299, 301-399, 1 23-11-00Page 47 1401-499, 1Aug 01/05 1 1 1CES 1

 HF Antenna Coupler - Flow Diagram (Sheet 2/3)
 Figure 015

R 1EFF : 051-099, 106-149, 201-299, 301-399, 1 23-11-00Page 48 1401-499, 1Aug 01/05 1 1 1CES 1

 HF Antenna Coupler - Flow Diagram (Sheet 3/3)
 Figure 016

R 1EFF : 051-099, 106-149, 201-299, 301-399, 1 23-11-00Page 49 1401-499, 1Aug 01/05 1 1 1CES 1 When all these conditions are satisfied, a pulse is applied to the sequence counter. The system is forced to the reception/standby phase.

 (b)
 Reception/standby sequence In this position, the coupler is in reception condition and ready for a tuning cycle. PTT control grounding causes interlocking of couplers (case of dual system). A pulse is applied to the sequence counter and the system is forced to the next tuning sequence: tune A.
　
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