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3. INPT technical specifications
The key features of the National Shared Communications Infrastructure (INPT) are as follows:
frequency bands between 380 and 430 MHz ;
TETRAPOL technology from the V35 version;
modulation: GMSK (Gaussian Minimum Shift Keying) ;
channel spacing: 10 kHz ;
measured channel width: 10 kHz.
TETRAPOL is a digital radiocommunication standard, mainly implemented in equipment used by security forces, such as the ANTARES system used by civil protection, fire departments and emergency medical services.
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