The TX325 is a GOES satellite data transmitter and is the successor to the TX321. In the Western Hemisphere, it is compatible for use with NOAA’s GOES DCS with a coverage range including Canada, the United States of America, and Mexico—as well as most countries in Central America and many South American countries.
The TX325 is the telemetry backbone for many data collection platforms (DCP) that utilize GOES satellites. The satellite transmitter can be integrated with a number of Campbell Scientific data loggers and is an available communications option for many of our systems, serving a wide range of applications.
The TX325 transmitter can transmit either self-timed or random GOES messages to the GOES West and GOES East satellites. In a typical configuration, the TX325 is connected to a data logger via an RS-232 serial connection. The data logger makes measurements, then formats those values to create a data packet which is then transferred to the TX325. The TX325 then buffers the message until its transmission window (or random transmission time), when it will then transmit the data at either 300 or 1200 bps.
Extremely accurate timing is obtained from the integrated GPS receiver (±100 μs), and the internal clock is capable of maintaining accurate time for a minimum of 20 days. If the TX325 finds itself without an accurate time, it suspends data transmissions until an accurate time is obtained.
Detailed diagnostic information about the radio is also available for the field technician and various diagnostic uses. These diagnostic parameters include the following:
|Transmit RF Out Connector||Type N jack|
|Operating Temperature Range||-40° to +55°C|
|Storage Temperature Range||-55° to +75°C|
|Certifications||NOAA/NESDIS GOES High Data Rate Certification Standard V2 Certification #12142012|
|Case Dimensions||15.88 x 12.7 x 4.57 cm (6.25 x 5 x 1.8 in.) not including connectors|
|Maximum Dimensions||15.88 x 14.99 x 4.57 cm (6.25 x 5.9 x 1.8 in.) including connectors|
|Weight||0.77 kg (1.7 lb)|
|Supply Voltage Range||10.5 to 16 Vdc|
|Typical Current Drain||
|Connector||2-pin screw terminal, 0.2 in. pitch|
Up to 23.1 V (reverse polarity and overvoltage)
Total system current is fused at 5 A with replaceable fuse
|Baud Rates||300 and 1200 bps|
|Transmit Power (300 baud)||
|Transmit Power (1200 baud)||
|Frequency Range||401.701 to 402.09925 MHz|
|Initial Frequency Stability||±20 Hz disciplined to GPS (GPS fix occurs after power up and once per day thereafter.)|
|Receiver Type||3.3 V active|
|Connector Type||SMA jack|
|Initial Accuracy||±100 μs (synchronized to GPS)|
|Drift||±40 ms/day (without GPS)|
|GPS Schedule||1 fix at power up (updated at roughly an 11-hour rate)|
|Transmission Continuation without GPS Fix||6 days|
|RS-232||DB9, DB9 F, DCE, 3-wire RS-232|
|Satellite RF Transmit Out||Type N jack|
|Power||2-pin screw terminal, 0.2 in. pitch|
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
|CR1000X||Requires OS version 4 or greater.|
|CR300||Requires OS version 10 or greater.|
|CR3000||Requires OS version 32.04 or greater.|
|CR310||Requires OS version 10 or greater.|
|CR6||Requires OS version 10 or greater.|
|CR800||Requires OS version 32.04 or greater.|
|CR850||Requires OS version 32.04 or greater.|
CR3000, CR1000, or CR800-series data logger program for the TX325 that sets up self-timed and random transmissions and reads diagnostic information. Another TX325 program is available for the GRANITE-series, CR6, CR1000X, or CR300-series data loggers because they are programmed differently.
GRANITE-series, CR6, CR1000X, or CR300-series data logger program for the TX326 and TX325 that sets up self-timed and random transmissions and reads diagnostic information. Another program is available for the TX325 with the CR3000, CR1000, or CR800-series data loggers because they are programmed differently.