The RF427 is a high-speed 900 MHz serial radio designed for unlicensed operation in Brazil. The RF427 is a frequency-hopping spread-spectrum radio with a configurable transmit-power output of 5 to 250 mW and user-selectable channel masking for improved RF interference immunity. This power-sipping, yet speedy, radio provides a cost-effective way to network data loggers.
The RF427 is part of the RF407 series of radios that includes:
|Type de radio||Frequency Hopping Spread Spectrum (FHSS)|
|Gamme de fréquence||905/920 MHz|
|Transmission Distance||-Note- Transmission distance assumes line-of-sight and appropriate antenna. Line-of-sight obstructions, RF interference, and antenna type will affect transmission distance.|
|Distance de transmission||Up to 1.61 km (1 mi) with omnidirectional antenna; up to 16.09 km (10 mi) with higher-gain directional antennas at ideal conditions|
|Puissance de sortie||5 to 250 mW (user-selectable)|
|Receiver Sensitivity||-101 dBm|
|Channel Capacity||Eight 25-channel hop sequences sharing 43 available channels|
|Vitesse de transmission||200 kbps|
|Link Throughput||105 kbps (maximum)|
|Connecteur d'antenne||Reverse Polarity SMA (RPSMA) jack|
|LEDs||Red TX/PWR and green RX|
|RS-232 Baud Rate||1200 to 115200 bps|
|CS I/O Modes||SDC 7, 8, 10, 11, and ME master|
|Température de fonctionnement||-40° to +70°C|
|Power||9 to 16 Vdc|
|Power Connector||2.5 mm DC power jack|
|Powered Over||CS I/O or barrel plug|
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.
|Brazil (ANATEL)||08335-17-10644 (standards in Resolution No. 506)|
The RF427 is over-the-air compatible with other RF427-based products. The RF427 can only communicate wirelessly with other RF427 radios and other Campbell Scientific products that have the "-RF427" option.
|Data Logger||RS-232||CS I/O|
|Mixed-array data loggers||**|
*Use a 18663 null modem cable.
**It is possible to connect a mixed-array data logger (e.g., CR10, CR10X, CR23X, 21X, CR7) by using an SC932A or SC105 between the data logger's CS I/O port and the RF427's RS-232 port.
Nombre de FAQ au sujet de(s) RF427: 1
If you have an RF401/RF401A/RF407/RF411A/RF412/RF427 network that has been working reliably for months and then suddenly fails with intermittent data collection, the site hasn’t changed, and there hasn’t been any new construction in the area, the issue may be caused by a piece of new equipment that was installed on the job site during the COVID-19 pandemic.
Because of the COVID-19 pandemic, some job sites implemented badge sensor technology for contact tracing and social distancing. Often, these devices operate on Wi-Fi or Bluetooth, but some of them operate in the 900 MHz range, which is used by our spread-spectrum radios and can, therefore, cause interference. Fortunately, you can resolve this issue using radio channel masking.
The following outlines the steps that were taken to correct this issue in one specific example:
For more detailed information about using radio channel masking, refer to your spread-spectrum radio manual. For example, the RF407-Series manual has a section devoted to this topic.