Casella CEL Nomad portable weather station - Manual (Page 59)

Number of RF channels 17
Channel Separation 25 kHz / 12 kHz
Modulation F3D
Receiver Sensitivity 0.3 µV for 10 dB SINAD
Antenna Connector BNC/TNC
8.3.2 High Power Radio Modem Specification
Interface Baud Rate
(standard) 19200, 9600; 4800, 2400, 1200
(extended) 600, 300, 150
Data Word 8 bits
Parity Odd, even, none
Stop Bits 1
Modulation Gaussian minimum shift keying
Interface RS232/RS422
Transmission speed 10 kbits/sec, 5 kbits/sec
8.3.3 High Power Radio General Specification
DC Supply Voltage 8.5 V to 14 V (12 V nominal)
DC Supply Current
Transmitting 330 mA
Receiving 80 mA
Stand By 0.1 mA
Size without base plate 114 mm x 65 mm x 26 mm
Size overall 140 mm x 65 mm x 26 mm
Operating Temperature -10 to +55
o
C
8.3.4 High Power Radio LED Indicators
Three LEDS on the front of the modem indicate the following states:
TX Green On when modem is transmitting data.
RX Green On when an RF carrier of greater than
0.9
µV is detected by the modem.
This threshold can be adjusted by a
potentiometer inside the modem.
POWER Red On when power is applied to the modem.
8.3.5 High Power Radio Standard Settings
The radio modem is supplied pre-configured with the following settings:
Baud Rate 9600
Parity None
Stop bits 1
Local Echo
Repeater mode OFF
XON /XOFF OFF
RTS/CTS OFF (no handshake)
Error Correction OFF
Address Mode OFF
Transmitter Test Mode OFF
Transmission speed SLOW (5K bits/sec)
RF Frequency (UK) 458.925MHz
RF Power 500 mW
8.4 Low Power Radio Link
Casella CEL can supply a Low Power Radio link that communicates between
Nomad and PC over a line-of site range up to 2 km (1.2 miles). It allows only
Communication
Page 59 of 68
NOMAD Portable Weather Station
Users Handbook