Operation - Honeywell KHF 1050 System Installation Manual

Preliminary - Subject to Change Without Notice
5.D.(1)(f) Narrow/Wide Freq Range - (J10531-100) NAR/W FREQ RNG
Revision 0
10640I00.SLK
KHF 1050 SYSTEM INSTALLATION MANUAL
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, or when both the LEFT
SIDE and RIGHT SIDE discrete inputs are asserted:
• The KRX 1053 Receiver/Exciter does not accept ARINC
429 data.
• The KRX 1053 Receiver/Exciter sets the SDI field of
all ARINC 429 transmitted messages to 00B, and it
sets bits 30 and 31 (status field) of all messages
except that with label 351 to 11B, indicating an
invalid condition shall set bits 30 and 31 (status
field) of the label 351 Maintenance Status message
to 00B, indicating a fault condition. It is intended
that at least one of these discrete inputs, but not
both, be asserted.
The KRX 1053 Receiver/Exciter processor samples the
state of these discrete inputs only at initial power
application. The state of these discretes are assumed
to not change during operation.
When the NARROW/WIDE FREQ RANGE discrete input is
asserted, the KRX 1053 Receiver/Exciter restricts
operations to the frequency range from 2.0000 MHz
through 22.9999 MHz, and clears bit 18 of the
Receiver/Exciter Output Label 037, Word ID #1 (Control
Status) word to logic 0.
When the NARROW/WIDE FREQ RANGE discrete input is not
asserted, the KRX 1053 Receiver/Exciter operates over
the full frequency range from 2.0000 MHz through
29.9999 Mhz.
If the NARROW/WIDE FREQ RANGE discrete input is
asserted and the HF controller commands a transmit or
receive frequency below 2.0000 MHz or above 22.9999
MHz, the receiver/exciter sets bits 30 and 31 of all
transmitted Frequency/Control Status words (label 037)
to 11B, indicating an invalid condition.
N
23-10-09
Page 2031
Mar/2003