VOR Operations
Enter a NAV frequency (108.000 MHz to 117.950 MHz) by using either manual
frequency selection or frequency search. The frequency selection is done in the same
manner used to select a COMM frequency. As usual, the selected frequency will appear
in the lower right-hand side of the screen.
If a VOR signal is not received on the selected frequency, the screen will display the
selected frequency only and nothing else. This is similar to the flag on a panel-mounted
NAV display. When a VOR signal is received, a screen similar to the following will be
displayed.
The Course Deviation Indicator (CDI) is on the top line of the screen. The CDI will
always be initially centered when a VOR signal is first acquired. When receiving a VOR
signal, each division on the CDI (starting with the edge of the center circle) represents a
two degree deviation. Therefore, the CDI on the JD-200 has the ability to display up to a
10 degree deviation to the right or left in VOR mode. The following example shows a 6
degree deviation to the right if your desired course is flying to the station on the 90
degree radial (fly left towards the needle to be on course).
The three digits in the lower left-hand side of the screen are the Omni Bearing Selector
(OBS) setting. Whenever the CDI needle is centered, such as when a VOR signal is first
received, the OBS setting represents your bearing to or radial from the selected VOR
station. The T or F following the OBS setting specifies whether the OBS setting is a
bearing to (T) or a radial from (F) the VOR.
The Clear Key may be pressed to toggle the OBS between To and From indications. In
the previous diagram, the OBS setting was 090T. By pressing the Clear Key, the
following OBS setting of 270F is obtained.
The OBS setting will remain set to the initial bearing or radial until otherwise changed.
The CDI needle will continuously update to show the deviation from the selected radial
or bearing as the aircraft moves.
To enter a desired bearing or radial, press the OBS Key. The OBS setting will begin to
flash. Enter the desired three digit radial or bearing using the Numeric Keypad. For
example, OBS 0 3 0 will enter 30 degrees as the OBS setting. The CDI will
automatically display the deviation from the selected bearing or radial. This process may
