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KHF 1050 SYSTEM INSTALLATION MANUAL
Page 2034
Revison 2 23-10-09 Apr/2006
When the BURST/CONTINUOUS TUNING MODE discrete input is
asserted, the KRX 1053 Receiver/Exciter operates by receiving bursts of
ARINC 429 tuning data.
In a system consisting of two external HF controllers, with one controller
connected to HF CONTROLLER INPUT #1 data bus and the other
connected to HF CONTROLLER INPUT #2 data bus, this tuning and control
mode allows the receiver/exciter to automatically accept tuning/control data
bursts from either controller.
In either the BURST or CONTINUOUS mode, the receiver/exciter sends
continuous data to the controller.
The KRX 1053 Receiver/Exciter processor samples the state of this discrete
input only at initial power application. The state of this discrete is assumed
to not change during operation.
5.D.(1)(d) Left Side (J10531-98) L SIDE and Right Side (J10531-13)
When the LEFT SIDE discrete input is asserted (grounded) and the RIGHT
SIDE discrete input is not asserted, the KRX 1053 Receiver/Exciter accepts
ARINC 429 data in which the SDI field is set to 10B, 00B, or 11B. (SDI field
00B identifies an “all call” message and SDI field 11B identifies a “tune both”
message.)
Additionally, the KRX 1053 Receiver/Exciter sets the SDI field of all ARINC
429 transmitted messages to 01B (bit 9 = 1, bit 10 = 0). This condition
identifies the system as HF #1.
When the RIGHT SIDE discrete input is asserted (grounded) and the LEFT
SIDE discrete input is not asserted, the KRX 1050 Receiver/Exciter accepts
ARINC 429 data in which the SDI field is set to 01B, 00B, or 11B.
(SDI field 00B identifies an “all call” message and SDI field 11B identifies a
“tune both” message.)
Additionally, the KRX 1053 Receiver/Exciter sets the SDI field of all ARINC
429 transmitted messages to 10B (bit 9 = 0, bit 10 = 1). This condition
identifies the system as HF #2.
When neither the LEFT SIDE discrete input nor the RIGHT SIDE discrete
input is asserted (grounded), or when both the LEFT SIDE and RIGHT SIDE
discrete inputs are asserted:
• The KRX 1053 Receiver/Exciter does not accept ARINC 429 data.
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