Becker Designed AR 3201 - Manual (Page 29)

3.6 LC display blinking
As soon as the operating voltage for the transceiver drops to a value of 10.5 V to 11 V, the display
starts blinking to signalize, e.g. in battery operation that the batteries need recharging. The display will
start blinking in transmitter operation since this situation involves the highest current drain.
Since the discharge curves of batteries greatly depend on the type of batteries involved, e.g. lead-acid
or nickel batteries and on the ambient temperature of the batteries, no accurate indication can be given
as to how long the transceiver will remain fully functional on commencement of LC display blinking.
After a few keying cycles, the batteries can be empty in transmitter operation. In receiver operation
the instrument will remain functional for approx. 1-2 hours from commencement of blinking.
At an operating voltage of 10 V, the transceiver remains fully functional, but at reduced output power.
3.7 IC operation
1. Switch on IC switch.
2. Carry out speech test.
3. IC volume can be adapted to the noise Ievel of the aircraft by means of the IC volume control see
(Fig. 2-7).
3.8 Optional temperature, voltage measurement
When the standard version is supplemented by optional temperature and voltage measurement
circuits, note:
Temperature of voltage is measured continuously, whereas display follows only after pressing the
external pushbutton for approx. 4 sec, after which the previously set channel frequency appears.
NOTE
Independent of the temperature or voltage measurement, transceiver operation is
available at the set channel frequency even when the instrument is displaying a tempe-
rature or voltage indication.
3.9 Auxiliary audio input (optional) (standard as of module No. 471)
Via the auxiliary audio input, other radio equipment (e.g.navigation receiver) can be monitored. When
the system is wired up for this application, the volume control of the remote equipment must be set so
that these inputs are intelligible and can be differentiated from each other.
During transmission the auxiliary input from the audio output amplifier is OFF.
3.10 No channel frequency storage
When the stored frequencies are lost when the transceiver is switched off, first measure the battery
voltage at the two button batteries which must be 2.4 V. These batteries are automatically charged
when the transceiver is switched on. When the unit is not switched on for a long time, or in lengthy
storage, the batteries may become discharged. To recharge the battery, it is sufficient to simply connect
the transceiver to the aircraft voltage for a couple of hours. The service life of a new battery is between
3 and 5 years.
AR 3201 - ( )
DV 28110.03/04 Issue 02/92 Page 3-5