USER MANUAL
— Aircraft Interface Device
Page 10 of 13
Rosemount Aerospace Inc. Model 8730L Series
D06429976 Revision 06
UTC AEROSPACE SYSTEMS PROPRIETARY
SUBJECT TO THE RESTRICTION ON THE TITLE OR COVER PAGE.
U.S. Export Classification: EAR: 7E994
The AID provides a chassis ground electrical bonding path through a metal surface contact around its mounting
holes. In addition, the AID bonds its connector shells to local chassis ground and provides a chassis ground pin
in connector J1. One or more of these points should be connected to the aircraft chassis ground through a low
impedance connection path.
2.4 Power Requirements
The AID requires 28 VDC aircraft power as defined in Table 3. Circuit breakers should be chosen based on max
current as shown.
Table 3: Power Supply
Power Characteristic
Value
Voltage
+28 VDC nominal (18 VDC
– 32.2 VDC range)
Current (typical)
0.71A @ 28VDC
Current (max continuous)
0.9A @ 28VDC
Inrush Current (max)
6A @ 28VDC (<100ms)
Power Consumption (typical idle)
20W
Power Consumption (max continuous)
25W
2.5 Wireless Antenna Recommendations
Attached cellular antennas should be Laird part number DBA6927C1-xxxxx. Alternate antennas with similar
performance may be suitable. Gain should not exceed 0.5 dBi at 698-960 MHz and 2.2 dBi at 1710-2700 MHz.
Cellular antennas must be connected through a coaxial cable of at least 20cm length. It is recommended that the
coaxial cable attenuation characteristic is similar or better than Times Microwave Systems Maxgain-200.
Attached Wi-Fi antenna should be Laird part number MAF94271. Alternate antennas with similar performance
may be suitable. Gain should not exceed 2.1 dBi at 2.45 GHz, 2.4 dBi at 4.9 GHz, 2.6 dBi at 5.25 GHz, and 3.4
dBi at 5.875 GHz. The Wi-Fi antenna can be placed directly on the AID, but remote locations through a high
performance coaxial cable may offer improved performance depending on location. Maxgain-200 or better cabling
is recommended.
Guidelines for placement of the antennas:
Antennas should be located in an area with apertures to allow transmission
– that is, not a fully enclosed
metal structure.
Maximizing spatial and orthogonal diversity is desired. Locate the antennas not near one another and
rotated 90° relative to one another.
Strive for at least 1 foot away from metal structure.
If a mounting bracket is used to retain the radiating element portion of the antenna(s), it should be non-
metallic and RF-transparent. Avoid carbon based dyes or paint that can hinder RF transmission.
Install antennas in a location where 20 cm is normal
ly maintained between the transmitter’s radiating
structures and the body of nearby persons.
