FSG 70/FSG 71M
O
PERATION
M
ANUAL
Reprint July 1998
Page
3 - 13
W. Dittel GmbH
P303
JUMPER J303 ACROSS PIN 1 + 2: FACTORY SETTING
JUMPER J303 ACROSS PIN 2 + 3: AF-EXTERNAL
Fig. 3-10 Activating the AF EXTERNAL Input
Jumper J303 is accessible after opening the
upper cover.
At the
FSG 71M
the Memory P.C. Board has to be
removed first.
Changing the jumper may only be performed by
authorized personnel.
3.4.6
Illumination of the Frequency Display
All transceivers of the
FSG 70-System
are equipped with an illumination of the
frequency display. The lamp voltage is supplied via the aircraft's dimmer or directly
from the aircraft supply. The lamp voltage is stamped on the type plate. If a 14Vdc-
lighting should be connected to a 28Vdc aircraft supply, a 680 Ohm resistor (0.5 W) in
series is necessary.
IMPORTANT!
•
The illumination is not turned ON or OFF by the unit's ON/OFF switch.
To save energy we recommend a separate lighting switch if the unit is
battery powered.
3.4.7
Connection to 28Vdc aircraft bus
To connect the transceiver to a 28Vdc bus a suitable voltage regulator must be used.
Wiring refer to Installation Manual of the Voltage Regulator.