Nat SM41, Installation And Operation Manual, Page: 29 / 68

SM41 Rev. 4.00 NPX138 Panel Mount Radio Manual
Nov 10, 2003 Page 2-5
ENG-FORM: 805-0104.DOT
Amendment #2 Aug 19, 2004
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.3.7.2 Power On Checks
a) Install the NPX138 and power up the ship’s systems. Turn on the radio. Check the
operation of all front panel controls. Adjust brightness and volume levels as required.
b)
Check all transmit and receive functions. Ensure the RX/TX status indicator
lights green when the radio is keyed to transmit and amber when receiving.
c)
Check the SCAN function. Note: you may be unable to hear the received
audio if the tones do not match those set in the radio. To avoid any confusion,
tones should be set to OFF (via the status edit mode) during scanning so that all
channels will be heard.
d)
Check the antenna feedline at the R/T with a through-line wattmeter and suitable
frequency elements to ensure correct antenna matching. Reflected power in
excess of 25% represents a serious problem, and should be investigated
carefully, or serious RFI and system interference as well as possible radio
damage may result. A VSWR measurement over 3.0:1 represents a significant
loss in signal power to the antenna. Check that forward power is to
specifications over the frequency band of the radio.
2.3.8 Post Installation EMI Test
The purpose of this test is to identify any interference that the NPX138 may cause with
existing aircraft systems. The NPX138 should be tested in accordance with the
Installation Approval Test Procedure (see section 2.5), and the test results documented
on the record sheets.
2.4 Continued Airworthiness
Maintenance of the NPX138 is ‘on condition’ only. Periodic maintenance of these
products is not required.
2.5 Installation Drawings
DRAWING REV. DESCRIPTION TYPE
NPX138\403-0 1.40 Panel Mount Radio Interconnect
NPX138\403-1 1.00 Panel Mount Radio Interconnect
NPX138\405-0 1.20 Panel Mount Radio Connector Map
NPX138\634-0 1.10 Post Installation EMI Test Installation Approval Test Procedure
NPX138\905-0 1.50 Panel Mount Radio Faceplate
NPX138\922-0 1.20 Panel Mount Radio Mechanical
Section 2.0 ends after these Drawings