Wavecom W-SPECTRA (Automatic Monitoring System) V1.1.0 - Manual (Page 103)

WAVECOM Monitoring System W-SPECTRA, W-SPEED Manual V1.1.0 Transmission Modes

93
Frequency range Unlicensed: ETSI TS 102 490
446.100 - 446.200 MHz (CEPT ECC/DEC/(05)12)
149.01875 - 149.11875 MHz
Licensed: ETSI TS 102 658
Licensed PMR frequency bands
Operation modes FDMA, digital voice and data system
Modulation 4FSK (constant envelope FSK)
Symbol rate 2400 Bd
Receiver settings BW ≥ 6.25 kHz
Input format(s) IF
Additional Info Voice codec: AMBE+2 (3600 bps)
Bit rate: 4800 bps
Supported Modes
 dPMR446
 dPMR Mode 1
 dPMR Mode 2
TS 102 490 covers only license-free hand portable equipment operating in peer-to-peer mode. The radios
should have an integral antenna and are limited in their output power. The standard is also called as
dPMR446.
TS 102 658 uses the same air interface technology as in dPMR446 without the limitations of the license-
free counterpart. It supports different levels of functionality as listed below.
 Mode 1: Peer-to-peer direct network
 Mode 2: Conventional repeater network
 Mode 3: Managed centralized network
The current version of the dPMR decoder supports the Modes 1 and 2 as well as the license-free dPMR446
operation.
To use the mode set Offset to the IF output of the receiver. Decoded voice will be saved in a “.wav” file in
the default Data-Output directory. Use the Mute button to mute or un-mute live voice output to the
speaker. In the menu “Option -> Message Type” user can set decoder output to “Data & Voice Frames” or
“Bit Transparent”. With “Bit Transparent” option the frames are just output in bits and no protocol decod-
ing is made. This may be useful when the frames are coded in another way than according to the ETSI
standard.
DTMF
The entire call number is transmitted by consecutive tones in decade sequence.
Parameter Value
Frequency range VHF/UHF
Operation modes Analogue Selcal
Modulation FM, SUB Tones
Receiver settings FM, BW = 12 kHz
Input format(s) AF, IF
The entire call number is transmitted by consecutive tones in decade sequence.
In most systems the accuracy of the single frequencies has to be within +1/-1.5% of the nominal value.