Modem Radio Spread-Spectrum 900 MHz Campbell Scientific RF401A

Thương hiệu: Campbell Scientific | Tình trạng: Còn hàng
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RF401A 900 MHz Spread-Spectrum Radio

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Modem Radio Spread-Spectrum 900 MHz Campbell Scientific RF401A


The RF401A is a 900 MHz radio designed for license-free use in several countries, including the United States and Canada. It provides a hassle-free way to create long-distance wireless links between your computer, dataloggers, and measurement devices. The RF401A has a 910 to 918 MHz operating-frequency range and a configurable transmit-power output of 5 to 250 mW.

Campbell Scientific recommends the RF401A radios for existing installations that require compatibility with products such as the RF401, CR206X, CR211X, AVW206, and AVW211. For new installations, Campbell Scientific recommends using the RF407 or RF451.

Note: The image depicts the RF401A with an attached antenna. The antenna is sold separately.

Benefits and Features

  • Rugged, low-cost transceivers

  • Can be used in the field as a transceiver or in the office as the base station

  • Individual FCC license not required

  • Transmits up to one mile with omnidirectional antenna; up to 10 miles with higher gain directional antennas at ideal conditions

  • Settings stored in non-volatile memory

  • Frequency-hops over 25 channels avoids interference from other spread spectrum radios

  • Optional extended temperature testing

  • Faster communication due to elimination of some small "link state packets"

  • Ability to have stand-alone RF router/repeaters (up to 8 repeaters)

  • Greater immunity to interference and RF collisions by using RF retries

  • Reduced power consumption by the datalogger, as the radios perform "packet address filtering"

  • Designed for use in PakBus networks

  • Built-in setup menus allow access to advanced functionality

Detailed Description

The RF401A is a frequency hopping spread spectrum radio designed for 900 MHz license-free ISM band operation. It has a 910 to 918 MHz operating-frequency range and a configurable transmit power output of 5 to 250 mW. It provides one of three selectable active connections including CS I/O, RS-232, and USB. It has a reverse polarity SMA (RPSMA) antenna jack connection. It is over the air compatible with legacy 9XStream products including the RF400, RF401, RF430, CR205, CR206(X), and AVW206.


Radio Type

Frequency Hopping Spread Spectrum (FHSS)


910 to 918 MHz

Power Output

5 to 250 mW (software-selectable)

Receiver Sensitivity

-109 dBm

Channel Capacity

7 hop sequences share 25 frequencies.

RF Throughput Data Rate

9.6 kbps

Data Rate

10 kbps

Antenna Connector

Reverse Polarity SMA (RPSMA) jack


Power on, Tx, Rx

RS-232 Baud Rate

1200 to 115200 bps

CS I/O Modes

SDC 7, 8, 10, 11, and ME master


9 to 16 Vdc

Power Connector

2.5 mm DC power jack

Operating Temperature Range

  • -25° to +50°C (standard)

  • -40° to +85°C (extended)

Current Required

  • Transmit: 80 mA (250 mW TX power)

  • Receive: 15 mA

  • Sleep: 0.5 mA (depending on power-saving mode)

Communication Ports

  • RS-232 9 pin D female

  • CS I/O 9 pin D male

  • USB Type B jack


11.1 x 6.9 x 2.7 cm (4.4 x 2.7 x 1.1 in.)
Dimension are from the tip of antenna connector to other side of case, and from the bottom of case to the top of DB9 connector jack screw. The width includes the thickness of the screw heads on the screws that hold the case together.


  • 136 g (4.8 oz) without "Ships With" items

  • 283.5 g (10 oz) with "Ships With" items


United States (FCC Part 15.247)


Industry Canada (IC)




RF401A and RF411A 900 MHz, 250 mW, Spread Spectrum Radios


RF401A-Series Spread Spectrum Radios

Technical Papers

Line of Sight Obstruction

The Link Budget and Fade Margin


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