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NPX138 Panel Mount Radio Manual
2.3.6
Mechanical Mounting
Installation of the transceiver should be in accordance with AC 43.13-1A chapter 2,
section 3, and AC 43.13-2A, chapter 2. Pr 35 Dzus rail or equivalent may be used.
Mounting the NPX138 requires a Dzus rail assembly with an opening width of 127 mm
(5 inches) and a front clearance width of 146.1 mm (5.75 inches). Height requirement is
47.6 mm (1.875 inches).
specifications to determine proper clearance dimensions.
clearance is allowed for the cable connections to each unit.
2.3.7
Post-Installation Checks
2.3.7.1
Voltage/resistance checks
Do not attach the NPX138 until the following conditions are met.
Check the following:
a)
P101 pins <12> and <13> for +28 Vdc relative to ground.
P101 pins <22>, <23>, <24> and <25> for continuity to ground (below 0.5 Ω).
b)
c)
Light voltage as per table below.
Ensure that the antenna is disconnected for the following test or erroneous
readings may be obtained
d)
Radio coax connector for continuity to the antenna coax connector (shield and
center conductor), and for open circuit from the center conductor to ground and
open circuit from the center conductor to the shield.
Page 2-4
ENG-FORM: 805-0104.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Refer to the mounting drawings and unit mechanical
P101 Pin #
28 Volt Models
14 Volt Models
5 Volt Models
Light Voltage
Be sure that adequate
Voltage
11
28 Vdc
10
14 Vdc
10
5 Vdc
SM41 Rev. 4.00
Nov 10, 2003
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