Install Manual Part 3

SKY497
Installation Manual
A-2
Rev. C
SIGNAL CHARACTERISTICS
Antenna Top Directional SUM (SIGMA) Port (Blue)
CONNECTION TRC J9, TNC connector.
CABLE Cable attenuation must not exceed 2.5 dB, VSWR
1.5:1. Refer to para 2.6.1.
Impedance: 50 Ω
Antenna Top Directional BIT PROBE Port (Black)
CONNECTION TRC J10, BNC connector.
CABLE Cable attenuation must not exceed 6 dB, VSWR
1.5:1. Refer to para 2.6.1.
Impedance: 50 Ω
Antenna Top Directional DIFFERENCE (DELTA) Port (Red)
CONNECTION TRC J11, TNC connector.
CABLE Cable attenuation must not exceed 2.5 dB, VSWR
1.5:1. Refer to para 2.6.1.
Impedance: 50 Ω
ARINC 429 External Interface The SKY497 has two ARINC 429 receivers and one transmitter (see para
2.6.5). The receivers operate at either low speed (12.5 kHz) or high speed
(100 kHz). The transmitter operates only at high speed (100 kHz).
The ARINC 429 transmitter is intended to provide the capability to
interface with alternate display devices other than the WX-1000/SKY497
display.
The two ARINC 429 receivers can be used to input data from other
avionics systems. The following labels are supported:
LABEL FUNCTION
164 Radio Altimeter (See note 1 & 3.)
203 Barometric Altitude (Uncorrected - see note 3.)
320 Magnetic Heading (See note 2 & 3.)
NOTES
1. The radio altimeter must provide full range output between 0
and 2500 feet. Not all altimeters provide this full range output.
The full range output can sometimes be obtained as a mod to
the radio altimeter . Check with the specific altimeter
manufacturer for compatibility and availability of modification,
if necessary.
2. When using 429 input for heading, the HEADING FLAG
SENSE (P1-68 - see para 2.6.2) should remain open (i.e., not
jumpered to configuration ground).
3. The TRC can only accept Radio Altimeter input from ARINC 429
source. The Barometric Altitude (uncorrected) can be ARINC 429 or
Gilham Code. The Magnetic Heading can be ARINC 429, Synchro
(XYZ) or Stepper depending on the configuration pins and
interconnect wiring. (See figure 2-2 or 2-3.)