Wulfsberg Electronics Division NTX403 User Manual
NTX Series Remote Mount FM Transceivers Manual
SM28 Rev. 2.10
The NTX Series Transceiver may be mounted in any attitude, but upright (mounting
hook at the bottom) is preferred for access and condensation drainage.
2.3.7 Post-Installation
Checks
2.3.7.1 Voltage/resistance
checks
Do not attach the NTX Series Transceiver until the following conditions are met.
Check the following:
a) P101
pins
<5> and <6> for +28 Vdc relative to ground.
b) P101
pins
<8> and <20> for continuity to ground (below 0.5
Ω).
Ensure that the antenna is disconnected for the following test or erroneous
readings may be obtained.
c)
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.
center conductor) and for open circuit from the center conductor to ground and
open circuit from the center conductor to the shield.
2.3.7.2
Power On checks
a)
Install the NTX Series Transceiver and power up the ship’s systems. Turn on the
control head. Check the operation of all front panel controls. Adjust brightness
and volume levels as required.
control head. 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 keying the radio to transmit and amber when receiving.
lights green when keying the radio 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,
set the tones to OFF (via the Status Edit mode) during scanning so that all
channels will be heard.
audio if the tones do not match those set in the radio. To avoid any confusion,
set the tones to OFF (via the Status Edit mode) during scanning so that all
channels will be heard.
e)
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.
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.
Page 2-4
Oct 25, 2002
ENG-FORM: 805-0104.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.