It is possible to use high speed UHF Radio Modems instead of cable to make point-to-point connection between the control room and the Field Communication Unit (FCU). Communication is completely transparent so the radio modems work just like a cable connection.
The radio modem can be connected to the serial port on the TankMaster PC / Host Computer or to the group bus port of an FCU.
In case there is a need to extend the coverage, a radio modem can be used as a repeater.
Depending on topographical conditions as well as gain and installation height of the antenna, the operating range is up to 40 km (25 miles).
Technical Data
Frequency range:
380 to 470 MHz, Half-Duplex.
Frequency stability:
< ± 1.5 kHz
Channel spacing:
12.5 / 25 kHz
Number of channels:
160 / 80
Transmitter:
Carrier power: 10 mW to 1 W / 50 O
Carrier power stability: +2 dB / -3 dB
Adjacent channel power: according to EN 300 220-1 / ETS 300 113
Spurious radiation: according to EN 300 220-1 /
ETS 300 113
Receiver:
Sensitivity: -116 to -110 dBm (BER 10-3)
Co-channel rejection: > -12 dB
Adjacent channel selectivity: > 60 dB / > 70 dB
Intermodulation attenuation: > 65 dB
Spurious radiation: < 2 nW
Modem:
Interface: RS232, RS422 or RS485
Interface connector: D15, female
Data speed of RS interface: 300 to 38400 bps
Data speed of radio interface: 19200 bps (25 kHz channel),
9600 bps (12.5 kHz channel)
Data formats:
Asynchronous data.
Ex Approval:
None.
Operating voltage:
9 to 30 VDC.
Power consumption:
1.8 VA typical (receive)
6.0 VA typical (transmit)
Temperature range:
-25 to + 55 °C (-13 to 131 °F).
Antenna connector:
TNC, 50 Ω, female.
Size (HxWxD):
137x67x29 mm (5.4x2.6x1.1 in.).
Weight:
250 g (0.6 lbs).