Front Panel - Javad ALPHA Operator's Manual

Introduction
Getting Acquainted
External Components
• If the REC LED is red, the receiver has run out of memory, has a hardware problem, or
contains an improper OAF (see "Option Authorization File (OAF)" on page 26 for more
information on OAFs).
• The REC LED blinks green or orange each time data is written to the internal receiver's
memory.
• Each time you turn off or on data recording, either a new file opens or data appends to a
particular file. See "Always Append to the File parameter" on page 36 and "Files Creation
Mode parameter" on page 36 for information on setting this function.
• Pressing the FN key for more than five and less than eight seconds will turn the baud rate
of serial port A to 9600. After about five seconds of pressing the FN key, the REC LED
becomes red. Release the FN key while the REC LED is red (during the next three
seconds).
• Pressing the FN key for more than eight seconds has no impact.
• After loading new firmware or clearing the receiver's NVRAM, the receiver checks its
internal file system. During this operation, the REC LED flashes orange, and the file
system is not accessible for CDU (control display unit) applications or for data recording.
This operation may require from fractions of a second to several minutes, depending on
the circumstances and the amount of internal memory.

Front Panel

The ALPHA receiver has the following ports (Figure 1-3):
• Power –used to connect the receiver to an external power source. This port can also be
used to charge the batteries.
• Serial – used for communication between the receiver and an external device.
• USB – used for high-speed data transfer and communication between the receiver and an
external device.
• The external antenna connects to the TNC external antenna connector.
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