Aeroflex 2948B Betriebsanleitung PDF herunterladen (Seite 257)

AVIONICS SYSTEM

B-12

Using the Bearing Left and Bearing Right facility

The [Bearing Left] and [Bearing Right] keys step the bearing in the selected direction through

each 10° point.

Using the Bearing To/From facility

VOR indicators can show the bearing to and from the beacon being received. Pressing the

[Bearing To/From] key cause the indication on the Service Monitor display to change by 180° and

show either

Bearing to Beacon or Bearing from Beacon as appropriate.

Using the Automatic Increment bearing facility

The Automatic Increment Bearing facility produces a changing signal that sweeps through 360°.

With

Bearing to Beacon selected, pressing the [Aut Inc Bearing] key will set the bearing to 0.0° and

then step up to 360.0° in 1° increments.

With

Bearing from beacon active, pressing the [Aut Inc Bearing] key will set the bearing to 360.0°

and then step down to 0.0° in 1° increments.

To stop the bearing incrementing, press the [Bearing] key.

Pressing any of the other bearing option soft keys will stop the bearing incrementing, but will also

perform their own function.

Using the VOR Ident facility

To simulate the VOR ident signal select the [Ident] key within the VOR menu. A tone of

approximately 1020 Hz is applied to the carrier frequency.

The depth of modulation can be changed by first pressing the [AM Depth] key and then entering

the required level using the data entry keys and the [%] terminator key or by adjusting the value

using the variable control. The VOR 30 Hz reference tone and 30 Hz subcarrier tone are both

disabled while producing the ident signal.

SELCAL

B5150

Fig. B-7 SELCAL screen and menu

Selecting the SELCAL function displays the SELCAL screen and menu. The tone sequence

currently set up is shown in the center of the display in large upper-case letters.

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Aeroflex 2948B Betriebsanleitung Seite 257