MD69BRX
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11.2 Normal Operation
In normal operation, the TRUE HEADING indicator (blue) and the MAGNETIC HEADING indicator
(yellow) are used to show the type of heading displayed.
If True Heading is being displayed then the TRUE HEADING indicator will be illuminated. If
Magnetic Heading is being displayed then the MAGNETIC HEADING indicator will be illuminated.
11.3 Illumination Control
The illumination level of the dials and indicators are adjusted using the rotary dimmer control
mounted in the repeater bowl or by an external remote dimmer connection.
The bowl mounted dimmer control includes a push button function (press the control knob) which
is used for Alert Acknowledge and Self Test functions,
Note: At the minimum illumination level, the dial illumination is fully extinguished. However, active
indicators remain lit at a very low level to allow reading of the indicators in total darkness.
11.4 Heading Type Indication
The type of heading being displayed depends on the received data. The respective TRUE
HEADING or MAGNETIC HEADING indicator will illuminate to indicate the type of heading being
displayed. If both heading types are available, the dial will default to TRUE.
11.5 Loss of Data Indication
The MD69BR repeater should be refreshed with data at least three times a second. If no valid
data is received, MD69BR will indicate this to the user by rotating the dial ±35° about the last
known valid heading.
11.6 Automatic Baud Rate Detection
If valid data is not received, then the MD69BRX will scan all available Baud rates to look for valid
data at an alternative rate. If valid data corresponding to the list of acceptable data sentences is
found, then the Baud rate of that data will be stored and used for future data reception. With this
feature there is no requirement to pre-select a Baud rate for data transmission.
