Long-distance option for communication
Overview
The RF321 is a 400.5 to 416.5 MHz radio. Campbell Scientific’s RF320-series narrowband UHF/VHF radio transceivers provide a long-distance telemetry option for communicating with remote measurement stations. Each radio includes a configured Ritron DTX-L radio, a mounting bracket, and a cable for connecting the radio to a radio modem. The different models vary by the frequency ranges they support.
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Detailed Description
The RF321 is programmed by Campbell Scientific to the frequency that was assigned by the Federal Communications Commission (FCC). This frequency must be specified at time of order so that it can be programmed into the radio.
A user-supplied antenna is required for each radio; contact Campbell Scientific for more information about selecting the antenna and cable. Each radio must also be connected to an RF500M or RF310M radio modem.
Specifications
| Ritron Module | DTX-445 |
| FCC ID | AIERIT17-445 |
| Industry Canada ID | 1084A-RIT17445 |
| FCC Rule Parts | 90 |
| Industry Canada Rule Parts | RSS-119 |
| Frequency Range | 400.5 to 416.5 MHz |
| RF Channels | 8 independent Tx/Rx frequencies |
| Synthesizer Step | 6.25 kHz |
| Channel Spacing | 12.5 kHz |
| Frequency Stability | ±1.5 PPM (-30° to +60°C) |
| Input Voltage | 9 to 17 Vdc |
| Antenna Connector | BNC socket (female) |
| Dimensions | 14.5 x 7.6 x 3.5 cm (5.7 x 3 x 1.375 in.) |
| Weight | 0.2 kg (7.3 oz) |
Current Drain @ 12.5 Vdc |
|
| Receive Standby | 25 mA |
| Transmitter |
|
Receiver |
|
| Receiver Type | 12.5 kHz narrowband |
| Sensitivity | 0.25 μV (12 dB SINAD) |
| Adjacent Channel | -60 dB |
| Receiver Attack Time | < 10 ms (Tx to Rx) |
| Noise Squelch Sensitivity | PC adjustable (factory set for -121 dBm) |
Transmitter |
|
| RF Power Output | 2 W or 5 W (@ 12.5 Vdc) |
| Duty Cycle | 50% (< 13.5 V, 5 W output, 25°C) |
| Voice Emissions Designator | 10K0F3E |
| Data Emissions Designator | 9K8F1D, 11K0F2D, 11K0F3D |
| Transmitter Attack Time | < 10 ms |
Compatibility
Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.
Data Loggers
| Product | Compatible | Note |
|---|---|---|
| 21X (retired) | This data logger is only compatible if the RF500M radio modem is used. | |
| CR10 (retired) | This data logger is only compatible if the RF500M radio modem is used. | |
| CR1000 (retired) | This data logger is only compatible if the RF500M radio modem is used. | |
| CR1000X | This data logger is only compatible if the RF500M radio modem is used. | |
| CR10X (retired) | This data logger is only compatible if the RF500M radio modem is used. | |
| CR200X (retired) | The CR200X-series dataloggers are only compatible if the RF500M radio modem is used. | |
| CR206X (retired) | The CR200X-series dataloggers are only compatible if the RF500M radio modem is used. | |
| CR211X (retired) | The CR200X-series dataloggers are only compatible if the RF500M radio modem is used. | |
| CR216X (retired) | The CR200X-series dataloggers are only compatible if the RF500M radio modem is used. | |
| CR23X (retired) | This data logger is only compatible if the RF500M radio modem is used. | |
| CR295X (retired) | The CR200X-series dataloggers are only compatible if the RF500M radio modem is used. | |
| CR300 | This data logger is only compatible if the RF500M radio modem is used. | |
| CR3000 (retired) | This data logger is only compatible if the RF500M radio modem is used. | |
| CR310 | This data logger is only compatible if the RF500M radio modem is used. | |
| CR350 | This data logger is only compatible if the RF500M radio modem is used. | |
| CR500 (retired) | This data logger is only compatible if the RF500M radio modem is used. | |
| CR5000 (retired) | ||
| CR510 (retired) | This data logger is only compatible if the RF500M radio modem is used. | |
| CR6 | This data logger is only compatible if the RF500M radio modem is used. | |
| CR800 (retired) | This data logger is only compatible if the RF500M radio modem is used. | |
| CR850 (retired) | This data logger is only compatible if the RF500M radio modem is used. | |
| CR9000 (retired) | ||
| CR9000X (retired) |
Documents
Frequently Asked Questions
Number of FAQs related to RF321: 2
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No. The RF500M cannot be directly interfaced with a GPS receiver. However, most Campbell Scientific data loggers can be interfaced with the output from a GPS receiver and programmed to extract the positional information. This information can then be accessed via an RF500M/RF320 RF link.
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It is possible to connect two antennas to a single radio via a properly specified (operating frequency and power handling capability) two-way, 50 ohm RF power divider. One example of this type of power divider is offered by Pasternack. Note that using a device like this will induce additional losses into the system (3 to 4 dB, typically).
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