10 power considerations, Antennas, 1 antennas for the rf450 series – Campbell Scientific RF450 Spread Spectrum Radio User Manual
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RF450 Spread Spectrum Radio
3.10 Power Considerations
The RF450 radio requires 6 to 30 VDC power. This may be supplied through
either a wall charger (CSI part number 15966) connected to the DC power jack
on the side of the radio or through the datalogger via the CS I/O port.
Networks configured in multi-point mode take advantage of the low power
mode of the Slave radios at the datalogger site. This reduces the required
power at remote sites from about 75mA to less than 10 mA in most
applications. Power savings occur only when the Slave is not transmitting
data. Also, low power mode is of little value when a Slave has a constant, high
throughput. Master and repeater radios do not go into a low power mode.
RF450 power requirements in the various states of operation are listed in Table
3.10-1.
For help with determining a power budget and solar panel sizes for remote
sites, see the Campbell Scientific Application Note titled “Power Supplies”
available from our web site:
TABLE 3.10-1. Power Requirements at 12 VDC
Transmit current, for 1 W power at 100% duty cycle 500 mA
Receive current
75 mA
Idle current
21 mA
Sleep current
6 mA
4. Antennas
4.1 Antennas for the RF450 Series
Several antennas are offered to satisfy the needs for various Master and Slave
requirements. These antennas have been tested at an authorized FCC open-
field test site and are certified to be in compliance with FCC emissions limits.
The use of an unauthorized antenna could cause transmitted field strengths in
excess of FCC rules, interfere with licensed services, and result in FCC
sanctions against user.
An FCC authorized antenna is a REQUIRED component. You
must pick one of the antennas listed below.
NOTE
Omnidirectional antennas are normally used at the base station and nearby
stations. Yagi antennas are needed at distant stations or other special cases.
Call one of our Applications Engineers for help in choosing an antenna. Only
the following FCC approved antennas can be used.
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