Wulfsberg Electronics Division NTX403 User Manual
NTX Series Remote Mount FM Transceivers Manual
SM28 Rev. 2.10
2.3.2 Cautions
Severe degradation of audio installations may result from incorrect wiring and shielding.
This could cause much higher cross-talk, hum, and ground-loop interference.
2.3.3 Notes
This could cause much higher cross-talk, hum, and ground-loop interference.
2.3.3 Notes
For maximum resistance to low frequency interference, electrically ground the case of
the NTX Series Transceiver.
2.3.4
the NTX Series Transceiver.
2.3.4
Cable and Wiring
All wires should be in accordance with MIL-W-22759 unless otherwise specified. All
cables should be in accordance with MIL-C-27500 unless otherwise specified. Use
solder sleeves (for shielded terminations) to make the most compact and easy to
terminate interconnects. Follow the wiring diagrams in Section 2.5 as required.
To provide easy installation of the hood, allow 3 inches from the end of the wire to the
shield termination. Note: Install the hood after the wiring is complete.
Installation cabling must allow the NTX Series transceiver to be easily withdrawn for
disconnection and field service adjustments. Ensure an adequate service loop in the
routing of the cables.
All wiring should be 22 AWG, except power and ground connections, which must be
18 AWG or larger, as indicated on the installation drawings. Ensure that the ground
connection is clean and well secured. To prevent inadvertent system failure, supply
power to this system from a separate breaker or fuse not connected to any other
device. NAT recommends a 5 A fuse or breaker (28 Vdc Source).
Coaxial cable should be in accordance with MIL-C-17 unless otherwise specified. Do
not use coax with PVC insulation. NAT recommends Teflon dielectric cable at or above
VHF frequencies or where cable runs exceed 8 feet. Note that at VHF frequencies,
cable losses due to long cable runs and tight bends may cut the ERP (Effective
Radiated Power) to less than 50% of specification.
To prevent RF interference between similar systems, NAT recommends that VHF FM
coax runs be widely separated, or be made using triaxial cable. Bond the outer shield
to the airframe at the transceiver end only.
In communication intensive applications, bad cable routing and shielding may drastically
compromise over-all system performance. Symptoms will be spurious squelch opening,
RFI (Radio-Frequency Interference), and garbled reception.
Neatly terminate RF cables (solder or crimp) and test for shorts prior to system check-
out (not while connected to the radio!!). Keep cable bends to a minimum at the antenna.
cables should be in accordance with MIL-C-27500 unless otherwise specified. Use
solder sleeves (for shielded terminations) to make the most compact and easy to
terminate interconnects. Follow the wiring diagrams in Section 2.5 as required.
To provide easy installation of the hood, allow 3 inches from the end of the wire to the
shield termination. Note: Install the hood after the wiring is complete.
Installation cabling must allow the NTX Series transceiver to be easily withdrawn for
disconnection and field service adjustments. Ensure an adequate service loop in the
routing of the cables.
All wiring should be 22 AWG, except power and ground connections, which must be
18 AWG or larger, as indicated on the installation drawings. Ensure that the ground
connection is clean and well secured. To prevent inadvertent system failure, supply
power to this system from a separate breaker or fuse not connected to any other
device. NAT recommends a 5 A fuse or breaker (28 Vdc Source).
Coaxial cable should be in accordance with MIL-C-17 unless otherwise specified. Do
not use coax with PVC insulation. NAT recommends Teflon dielectric cable at or above
VHF frequencies or where cable runs exceed 8 feet. Note that at VHF frequencies,
cable losses due to long cable runs and tight bends may cut the ERP (Effective
Radiated Power) to less than 50% of specification.
To prevent RF interference between similar systems, NAT recommends that VHF FM
coax runs be widely separated, or be made using triaxial cable. Bond the outer shield
to the airframe at the transceiver end only.
In communication intensive applications, bad cable routing and shielding may drastically
compromise over-all system performance. Symptoms will be spurious squelch opening,
RFI (Radio-Frequency Interference), and garbled reception.
Neatly terminate RF cables (solder or crimp) and test for shorts prior to system check-
out (not while connected to the radio!!). Keep cable bends to a minimum at the antenna.
Page 2-2
Oct 25, 2002
ENG-FORM: 805-0104.DOT
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