Viva Series, Instrument connections - All other connections, Cntrl.. Key 421
19.3 Radios for GPS Real-Time
Description For radios the channels on which the radio broadcasts can be changed. Changing channels
changes the frequency at which the radio operates. Not all radios support channel changing.
Changing radio channels is of interest in three cases.
Requirements for
channel changing
)
Channel changing may contravene radio broadcasting regulations in certain countries.
Before operating with radios, check the regulations in force in the working area.
)
The number of channels available and the frequency spacing between channels depends on
the radio used.
Case 1: Two real-time base stations are set up at two locations, each broadcasting
on a different channel.
If the signal from one base station is jammed, the channel can be changed
and the other base can be used.
Case 2: Set up as in case 1.
Two separate fixes for each point can be obtained, providing redundancy for
future least squares adjustment operations.
Case 3: One real-time base and one real-time rover are being used.
If the signal is blocked due to radio interference, the channel at the base and
the rover can be changed in order to work on a different frequency.
Pacific Crest radios: • channel changing must be activated by a Pacific Crest dealer.
• A special licence might be required.
Satelline radios: The radio must be in programming mode. This mode can be set by
a Satelline dealer.
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