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SIGNAL
Operational Mode Output
(optional)
Power Input (TRC)
Radio Altimeter (Analog)
Page A-8 - Appendix A
July 18, 2013
The document reference is online, please check the correspondence between the online documentation and the printed version.
SKY899
Installation Manual
CHARACTERISTICS
Operational mode output can drive a lamp annunciating when the system
is in operational mode. Output is switched to ground when system is in
operation mode. The lamp requires a separate dc source (constant or
dimming circuit). If lamp voltage is an ac source then an isolation relay
must be used.
CONNECTION
Connector-Pin
P1-31
CABLE
Minimum 22 AWG wire for lengths up to 30 ft.
VOLTAGE
ON: 0 V dc or Ground
OFF:
Maximum +32 V dc or open
CURRENT
Maximum current 300 mA.
18-32 V dc. A 5 A circuit breaker is required.
CONNECTION
Connector-Pin
P8-A
P8-B
CABLE
Use #16 AWG (min.) twisted shielded pair
cable (Beldon 83322, Alpha 2826/2, or
equivalent). Terminate shield to airframe at
sensor or power source.
VOLTAGE
18 to 32 V dc, 2.0 Amps (Maximum)
A radio altimeter enables ground intruder filtering, optimizes TA
sensitivity levels, and makes it possible to inhibit audio below 400 AGL.
Some analog radio altimeters utilize a discrete valid/invalid signal line to
indicate radio altitude validity, while others set the analog data input line
to a high out-of-range value for invalid altitude conditions. If a discrete
flag signal is not available leave RADIO_ALT_FLG (P1-14)
unconnected.
Some analog radio altimeters have multiple outputs (e.g., King model
KRA405), verify the output connected to matches the signal
characteristics listed in table A-1.
CONNECTION
CABLE
VOLTAGE
LOAD Z
MAX CAPACITANCE
Signal Name
OPER_MODE
Signal Name
+28V
+28V_RET
Connector-Pin
Signal Name
P1-6
RAD_ALT_IN_HI
P1-7
RAD_ALT_IN_LO
P1-14
RADIO_ALT_FLG
Minimum 22 AWG twisted shielded pair
cables for lengths up to 30 ft for signal input.
Minimum 22 AWG wire for lengths up to 30
ft for flag input.
0 to +35 V dc
>100 k Ohm
<20 pF per line.
009-11900-001
Revision F
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