L-3 Communications SKYWATCH HP SKY899 Series, Installation Manual, Page: 130 / 184

SKY899
Installation Manual
Page A-6 - Appendix A 009-11900-001
July 18, 2013 Revision F
SIGNAL CHARACTERISTICS
Heading Input These connections from the aircraft heading source (ARINC 407 & 407-1
(XYZ Synchro) Synchro System Manual) allow the unit to rotate the displayed data as
the aircraft turns. See Heading Flag in this appendix for flag input
specifications.
X(S1), Y(S3), Z(S2)
FREQUENCY Min: 50 Hz
Max: 1500 Hz
VOLTAGE Min: 5.0 V ac rms (w/reduced angular resolution.)
Max: 14.0 V ac rms (external padding required for
higher levels.)
INPUT IMPEDANCE >50 k
Ω
Heading Input CONNECTION Connector-Pin Signal Name
(XYZ Synchro) P1-46 HEADING_X
(Continued) P1-47 HEADING_Y
P1-48 HEADING_Z
CABLE See paragraph 2.6.4.
H and C (high and low reference - 400 Hz)
FREQUENCY Min: 320 Hz
Max: 480 Hz
VOLTAGE Min: 3 V ac rms
Max: 35 V ac rms
INPUT IMPEDANCE >50 k
Ω
CONNECTION
Connector-Pin Signal Name
P1-49 HEADING_H
P1-50 HEADING_C
CABLE See paragraph 2.6.4.
Heading Valid Indicates that the heading source is providing valid heading information.
The status of the heading valid signal can be none, active low, or active
high and must be selected during system setup via the service menu.
CONNECTION
Connector-Pin Signal Name
P1-51 HEADING_FLG
CABLE See paragraph 2.6.4.
VOLTAGE None: Open or no connection
Active Low: (ref. to aircraft electrical ground)
Valid signal: -5 V dc to +2.5 V dc
Invalid signal: +9 V dc to +32 V dc
or open
Active High: (ref. to aircraft electrical ground)
Valid signal: +9 V dc to +32 V dc
Invalid signal: -5 V dc to +2.5 V dc
or open
INPUT IMPEDANCE >2 k
Ω
INPUT CURRENT Active: Min: 1 mA Max: 15 mA
The document reference is online, please check the correspondence between the online documentation and the printed version.