Casella-cel Nomad portable weather station Manual do Utilizador descarregar pdf (Página 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

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

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NOMAD Portable Weather Station

Users Handbook

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