Galaxy G1
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§2.3 External Radio
§2.3.1 Radio features:
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 RTKGPS
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
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
