F. DME suppression
If required, connnect the suppression in/out of transponder (pin 10 of unit con-
nector P8) with the corresponding pin of the DME unit with type RG 178 B/U cable.
5. Installing the transponder antenna
A. The transponder antenna is fitted to the underside of the aircraft fuselage at a
horizontal, flat location in the longitudinal direction. This location should not be
in the "shadow" of aircraft structure items. The highest range is achievied when
the antenna is located at the low point on the aircraft fuselage.
B. The installation dimensions of the transponder antennas are shown in Fig. 2-3
to Fig. 2-5.
CAUTION :
• Tranponder antenna DMNI 70-1 is provided with a cork gasket which
must be interposed between the skin of the aircraft and the anten-
na. To mount the antenna use only stainless screws in conjunction
with lock washers.
• The transponder antenna ANT 2000 is provided with a silicone rub-
ber gasket which must also be interposed between the skin of the
aircraft and the antenna.
• In aircraft having a wooden or plastic airframe an electric counter-
weight plate or panel must be located within the fuselage at the an-
tenna location with minimum dimension 40 x 40 cm.
(1) Antenna cable
Use type RG 58 C/U coaxial cable when a length of 3 m or less is requi-
red. Use type RG 213/U when the length exceeds 3 m.
CAUTION :Keep the antenna cable as short as possible so that as little
power is dissipated in the cable as possible.
INSTALLATION AND OPERATION
ATC 3401 - (1) - R
Page 2-6
34-50-03 June 15/96
UNCONTROLLED COPY IF PRINTED
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