Spread-Spectrum Radios Minimize noise and interference from RF sources

Communications / Spread-Spectrum Radios

About Spread-Spectrum Radios

Spread-spectrum radios are very popular for creating wireless communication links to and between dataloggers. These low-cost devices provide robust links ranging in speeds from 10 to 200 kbps and distances of 3 to 50 miles, depending on the radio model and operating conditions. These radios consume little power and are easy to install and maintain, as they have been designed for low-power, non-licensed operation. Spread-spectrum radios spread the normally narrow-band information signal over a relatively wide band of frequencies. This allows the communication to be highly immune to noise and interference from RF (radio-frequency) sources.

Retired Products

Product Line

	Frequency	Operating Temperature Range	Communication Ports	Radio Type	Dimensions	Current Required	Power Output	Data Rate	Antenna Connector
RF416 2.4 GHz Spread-Spectrum Radio	2.450 to 2.482 GHz	-25° to +50°C	RS-232 9-pin D female (4 wire: Tx, Rx, CTS, GND) CS I/O 9-pin D male (Newer data loggers provide power to the radio on this connector. Data loggers purchased before December 1997 require the pn 14291 Field Power Cable.)	Frequency Hopping Spread Spectrum (FHSS)	11.4 x 7.0 x 2.9 cm (4.5 x 2.8 x 1.1 in.)	—	50 mW (nominal)	10 kbps	Reverse Polarity SMA (RPSMA)

Other Considerations

	Frequency	Operating Temperature Range	Communication Ports	Radio Type	Dimensions	Current Required	Power Output	Data Rate	Antenna Connector
RF427 905 MHz + 920 MHz Spread-Spectrum Radio	905/920 MHz	-40° to +70°C	RS-232 9-pin D female CS I/O 9-pin D male USB Type B jack	Frequency Hopping Spread Spectrum (FHSS)	11.1 x 6.9 x 2.7 cm (4.4 x 2.7 x 1.1 in.) Dimension are from the tip of the antenna connector to the other side of the case, and from the bottom of the case to the top of the DB9 connector jack screw. The width includes the thickness of the screw heads on the screws that hold the case together.	Average Transmit: < 80 mA (250 mW TX Power) Receive: 15 mA Sleep: 0.5 mA (depending on power-saving mode)	5 to 250 mW (user-selectable)	200 kbps	Reverse Polarity SMA (RPSMA) jack