Galaxy G6
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Chapter
Ⅴ
External Radio
§5.1 Overview
The radio GDL20 is a high-speed semi-manual wireless data transmission radio, whose air
transfer rate can be up to 19200 bps and the RF transmitter power is larger, used in Southern
RTK measurement system.
Radio GDL20 adopts GMSK modulation, 19200bps transfer rate, low bit error rate. RF
frequency can cover 450-470MHz band. Data transmission mode of GDL20 is transparent mode,
that is, the received data is sent to the RTK GPS system unchanged.
Radio GDL20 data interface is a standard RS-232 interface, which can be connected to any
RS-232 terminal equipment for data exchange.
GDL20 digital radio research employs advanced radio frequency technology, digital signal
processing technology and baseband processing technology, carefully selected high quality
components to organize production, to ensure the long-term stable and reliable operation;
Have a forward error correction control, digital error correction function.
It has eight transmitting and receiving channels. Can be changed according to the actual use of
the channel frequency, transmit power adjustable interval is 0.5MHz.
§5.2 Frequency Table
Channel number
Frequency
450-470MHz
Channel 1
463.125
Channel 2
464.125
Channel 3
465.125
Channel 4
466.125
Channel 5
463.625
Channel 6
464.625
Channel 7
465.625
Channel 8
466.625
