Honeywell
COMPONENT MAINTENANCE MANUAL
PART NUMBER 964-0452
1I.B.1516A Page 4
Mar 30/01
23-12-01
B. Electrical
The XK516D1 HF Transceiver mode of operation (SSB or AM voice, data, etc.) is controlled
via 2 ARINC 429 serial ports, which are connected on the aircraft to the radio management
panel. The Transceiver is configured for control via ARINC 429 words, both with label 037,
and words with label 205, 206, 207 (installation dependent).
The Transceiver can be connected by means of 2 additional ARINC 429 ports (receive and
transmit) to an on-board central fault display system (CFDS) according to ARINC 604 or to a
central maintenance computer (CMC). There are 3 input discretes (CFDS type programming
pins) that are available in the rear connector to identify the type of aircraft maintenance sys-
tem. The Transceiver automatically detects which type of aircraft maintenance system (CFDS
or CMC) it is connected to if the CFDS Type input discretes are all open.
Part Number 964-0452-002, 012, and 022 Tranceivers can also be connected to 1 or 2
ACARS Management Units (MU) or Communications Management Units (CMU) by means
of 1 transmit and 2 receive ARINC 429 ports to provide the means to exchange data link
messages with compatible HF Data Link Ground Stations when the Transceiver is operating
in the internal HFDL Data mode. Refer to Fig. 3 for the HF Voice/Data Radio System Inter-
connect Diagram, showing all the possible connections to other aircraft systems.
The FK 516 Antenna Coupler (part of XK 516D HF Radio system) is connected to the Trans-
ceiver by a coaxial cable and a multiwire control cable. The coaxial cable carries the RF sig-
nal and control data for the coupler. The coupler control data consists of serial data messages
sent via the inner conductor of the coaxial cable.The multiwire control cable provides the cou-
pler with 115V/400Hz (single phase) power. The control cable also provides the interlock wir-
ing between couplers in dual HF installations. As an option, for single HF installations, the
multiwire control cable may not be used. In this case, the coaxial cable also carries the Cou-
pler power supply (+28V).
C. Equipment Specifications
The specifications for the XK516D1 HF Transceiver are listed in Fig. 4.
D. Operation of XK516D1 in Voice Mode
(1) To operate the XK516D1 in Voice Mode, the operator selects either SSB Mode or AM
Mode on the Radio Control Panel and selects the frequency.
(2) The radio tunes to the selected frequency, and the received audio can immediately be
heard on the Audio Management System.
(3) To initiate transmission, the microphone keyline (PTT) must be grounded while speaking
into the microphone.
E. Operation of XK516D1 in HF Data Link Mode
(1) To select HF Data Link Mode, the operator must select DATA mode on the Radio Control
Panel.
(2) When the HFDR is placed in data mode, the HFDR performs an automatic frequency
search from a list of frequencies assigned to HF Data Sync operation. Voice communi-
cation through this radio is not possible during this mode of operation.
(3) Based on the aircraft’s position and time of day, the HFDR prioritizes its list of possible
frequencies so that frequencies with the highest probability of propagation are tried first.
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