Telephonics Corporation
R
A D A R
S
Y S T E M S
D
I V I S I O N
2-30
TM113806 (3/10)
• Side lobes with levels in the range of -21 to -25 dB with respect to the main beam with the
radome installed should not have been increased by more than 3 dB of the levels measured
with the radome NOT installed.
• Side lobes with energy levels below -25 dB, with respect to the main beam, may not be
increased.
4 Boresight
Errors
Boresight errors caused by the radome should not exceed 0.25 degrees.
If in doubt of the quality of radome material, a flight test may be performed that evaluates
performance over the anticipated ranges and tilt angles that are desired for the type of aircraft.
Refer to Advisory Circular AC No. 43-14 for additional radome information.
2.5.2 RT-1501A
Receiver-Transmitter
The receiver-transmitter may be installed in any convenient location within the limits imposed by the
waveguide lengths and environmental criteria. The mounting tray for the receiver-transmitter is
designed for front loading. A mounting tray equipped with vibration isolators is available as an option.
Clean all mounting surfaces before installing the mounting tray to ensure a good electrical bond to the
airframe.
The total mounting space required can be determined from dimensional information contained in the
R-T unit mounting tray outline drawing, Figure 2.4.1-4. At least 3 inches of free space must be allowed
between the cooling hole areas, on the top and right-hand side of the R-T unit, and other objects.
2.5.3 IU-1707
Interface
Unit
The interface unit should be installed in a location convenient for easy maintenance. It should also be
rather centrally located with respect to the other system LRUs, since it is electrically connected to all of
them (control unit, indicator, R-T unit, and antenna). The area should be free of excessive vibration,
heat, and noise-generating sources. The mounting tray for the interface unit is designed for front
loading. A mounting tray equipped with vibration isolators is available as an option. Clean all
mounting surfaces before installing the mounting tray to ensure a good electrical bond to the airframe.
Dimensions for locating the mounting holes and the total mounting space required can be determined
from the dimensional information contained on the mounting tray outline drawing, Figure 2.4.1-6.
When locating the mounting tray having vibration isolators in the aircraft, allow sway space at the top
and sides of the interface unit as called for on the outline drawing.
2.5.4
Installation of Waveguide and Cables
2.5.4.1 Cabling
The cables should be supported firmly enough to prevent movement. They should be carefully
protected wherever one may chafe against another, or against some other object. Extra protection
should be provided in all locations where the cables may be subject to abuse. Shields on shielded wires
should be grounded as shown on the system inter-wiring diagram, Figure 2.4.1-11.
The document reference is online, please check the correspondence between the online documentation and the printed version.
