Stonex S900
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GNSS Receiver – User Manual 13
3.5.1.1 UHF Radio
S900
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can have two different radio modules:
• TRM101 as default, with a working frequency between 410MHz and 470MHz
• TRM121 as optional, with two frequency bands: standard 410-470MHz and hopping 902.4-928MHz
For the 410-470MHz band, 8 channels with pre-set frequencies are available for quick configurations, the
frequency values can be edited and saved.
The channel detection function allows one to check if the channel frequencies in the area are already used for
transmission. In the example below it’s possible to see a transmission on frequency 440.125 MHz, while the
other frequencies are unused.
To receive the RTK corrections from the base, select the same frequency, radio protocol, spacing, and FEC. Be
sure to connect a UHF antenna to adapt to the frequency of the transmission. For hopping frequencies is
necessary to match the channel instead of the frequency.
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