Northern Airborne Technology NT4xx - Manual (Page 13)

SM04 Rev 4.00 UHF Transceiver Manual
Nov 27, 2003 Page 2-3
ENG-FORM: 805-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.3.4 Mechanical
Mounting
2.3.4.1 Tray mounting
Transceiver mounting is accomplished via a flat rack assembly, which must be securely
attached to existing structure with AN3 or larger bolts with suitable locking hardware
and washers. Note that the non-weight reduced radio is secured to the tray using a
"TORX" (or six-sided spline) screw to reduce tampering with equipment.
Shock mounting of the tray is not required except in extraordinary circumstances where
airframe vibration is very severe.
Insure that the unit is securely mounted before any flight is attempted.
Do not mount the transceiver in the path of any hot air exhaust, dripping condensation,
or oil leak.
Try to mount the transceiver close to the intended antenna location, as long cable runs
will dramatically increase losses to the antenna.
2.3.4.2 Cabling
Installation cabling MUST allow the unit to be easily withdrawn for removal. Insure an
adequate service loop is allowed in the routing of the cable. Do NOT bundle the RF
coax cable with the channeling wires.
Ground the transceiver with as short a ground wire as practical, and ensure the ground
connection is clean, and of good quality.
2.3.4.3 Control
Head
Do not mount the Tac/Com control head adjacent to, or bundle the cables with, a panel
mounted ADF, or faint 'birdies', (RF noise) may result on the ADF from the control
head's computer.
Insure that the unit is securely mounted before any flight is attempted.
Note that the case is grounded, but it should be attached to a grounded surface for RFI
shielding. A pin is provided for grounding the case and this must be connected via ITS
OWN WIRE to a suitable ground, not jumpered to the power ground wire connection.