Becker Designed AR 3201 LC display blinking, IC operation, No channel frequency storage

AR 3201 - ( )

3.6LC 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.

3.7IC 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).

3.8Optional 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.

3.9Auxiliary 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.

3.10No 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.

DV 28110.03/04 Issue 02/92 Page 3-5