TX56/56A and TX57/57A Installation Manual
5 April 2022
01776-00-01
Issue AD
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Trig Avionics
Page 83
14. USB File Format
14.1 Introduction
The TX56/TX57 radio internal database that can store up to 255 airfield
frequencies and up to 255 navaid frequencies.
These database entries can be created, edited, and deleted from the front panel
of the radio. They can also be saved to and loaded from a USB stick.
The data file used on the USB stick is a standard format called Comma
Separated Values or CSV, and the USB stick itself uses the popular FAT32 file
system, which means that the file can also be edited on a desktop computer.
CSV files can be edited using a simple text editor, or they can be opened by
most spreadsheet software.
The Com radio database is always loaded from and stored to a file called
TRIGCOM.CSV. The Nav radio database is always loaded from and stored to
a file called TRIGNAV.CSV; both are located in the root directory of the USB
stick.
14.2 Com Frequencies
Airfield frequencies are stored as an identifier (up to 4 characters), a standard
facility designator, such as TWR or GND, and the station frequency.
Each database record is written to a single line of the file, and is in the
following format:
<AIRFIELD>,<FACILITY>,<FREQUENCY>
For example:
EGPH,TWR,118.705
The airfield name can be up to 4 characters long. If a file is loaded with
entries longer than 4 characters, the names will be truncated.
The facility is one of the following:
