Filser Electronic GmbH
Gewerbestraße 2
ATR 720 C Communications Transceiver
86875 Waal
page 11
2.2.5 Interphone Interconnection
For Interphone wiring see ATR Interconnect diagram. An external double-pole switch is recom-
mended.
2.3
ATR 720 INSTALLATION
Listed below are factors and suggestions to consider before installing jour ATR 720 C system.
Close adherence to these suggestions will assure more satisfactory performance from jour
equipment.
1. The ATR 720 C is mounted rigid in the aircraft panel. Determine that the location and in-
stallation of radio equipment provides sufficient visibility and handling of the controls for the
pilot in his normal position. Mark and cut the mounting holes as shown in Figure 2-3. The
purpose of the behind aircraft mount cutout is to allow a margin of error in cutout size and
prevent the mounting tray front edge from being visible. The mounting tray lip should ex-
tend through the mounting hole flush with the instrument panel to insure proper plug in en-
gagement.
2.Avoid mounting close to any high external heat source. If this is done, no blower or ram air
cooling will be required.
3.Remember to allow adequate space for installation of cables and connectors.
4.Secure the mounting rack to instrument panel per Figure 2-3. The rearward mounting holes
must be attached to a structural member of the panel by means of support brackets, in or-
der to avoid vibration.
5.Slide the ATR 720 C into the rack and secure by turning locking screw an the rear panel.
- Caution
Do not force locking tab screw.
6.The installing agency will supply and fabricate all external cables. The plugs required are
supplied.
2.4
PS-2814-Installation
1.Select the PS 2814 location considering good thermal conductivity to the airframe, conven-
ient cable routing, proximity to the ATR 720 C and separation other heat sources.
2.Refer to Figure 2-4 for the PS 2814 mounting dimensions.
3.Secure the PS 2814 firmly in place. Service
4.The installing agency will supply and fabricate external cables.
2.5
Antenna Installation
a. A conventional 50 ohm vertically polarized COMM antenna is required with the ATR 720.
Vertical bent whip antennas are not recommended. Wideband COMM antennas provide ef-
ficient operation over the COMM ban. Antennas should be installed per manufactures rec-
ommendations. Additional recommendations are as follows:
1.
Mount antenna on flat metal surface or install a ground plane at least 50 cm x 50 cm.
2.
The antenna should be well removed from any projections and the engine(s) and propeller.
3.
The COMM antenna should be well separated form any NAV Antenna to minimize COMM in-
terference to NAV while transmitting.
b. Refer to Figure 2-5 for the COMM antenna cable connector assembly.
