Smaller form factor, easy to use, and rugged
Overview
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.
Read MoreBenefits and Features
- NESDIS HDR V2 certified (certification number 12142012)
- ANATEL certified (certification number 07995-21-10644)
- Compatible with GOES DCS system
- Easy integration with Campbell Scientific data loggers
- Field tested and proven track record of reliability
- Embedded GPS receiver for stabilized internal time keeping and transmit frequency for long service intervals
- Low standby current consumption for battery-powered systems at remote DCP installation sites
- Quick assessment of radio health via monitoring of diagnostic data from the radio
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Technical Description
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:
- Latitude and longitude using the built-in GPS
- Current battery voltage
- Current temperature
- Battery voltage before last transmission
- Temperature before last transmission
- Battery voltage during last transmission
- Altitude of last GPS position
- Time of last GPS position
- Number of GPS fix misses
- Time of last missed GPS fix
- GPS receiver health and status
- Failsafe tripped indication
- Duration of last transmission
- Forward power of last transmission
- Reflect power on last transmission
- VSWR (voltage standing wave ratio) last transmission results
- Current transmission state
Cable Options
On the Ordering Information page of the website, ensure you order the correct cable option to meet your needs.
- To connect the TX325 to the CR6 or CR1000X RS-232/CPI port. select the -R option.
- To connect the TX325 to the COM (C, U) ports of a data logger, select the -C option.
- To connect the TX325 to the 9-pin RS-232 port of a data logger, select the -S option.
Specifications
| Transmissions Supported |
|
| Data Format |
|
| Transmit RF Out Connector | Type N jack |
| Radio Module | OmniSat-3 |
| Operating Temperature Range | -40° to +60°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 Power |
|
| Supply Voltage Range | 10.5 to 16 Vdc |
| Typical Current Drain |
|
| Connector | 2-pin screw terminal, 0.2 in. pitch |
| Power Protection |
Up to 23.1 V (reverse polarity and overvoltage) Total system current is fused at 5 A with replaceable fuse |
Satellite GOES |
|
| 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.) |
| Channel Bandwidth |
|
GPS Receiver |
|
| -NOTE- | The TX325 can source up to 19 mA at 2.7 V for an external GPS antenna. Campbell Scientific recommends a maximum antenna Low-Noise Amplifier (LNA) of 1.5 dB. |
| Maximum RF Input Gain | 25 dB |
| Receiver Type | 3.3 V active |
| Connector Type | SMA jack |
Timekeeping |
|
| 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 |
Interface Connectors |
|
| RS-232 | DB9, DB9 F, DCE, 3-wire RS-232 |
| Satellite RF Transmit Out | Type N jack |
| GPS | SMA jack |
| Power | 2-pin screw terminal, 0.2 in. pitch |
Compatibility
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
Dataloggers
| Product | Compatible | Note |
|---|---|---|
| CR1000 (retired) | Requires OS version 32.04 or greater. | |
| CR1000X | Requires OS version 4 or greater. | |
| CR300 | Requires OS version 10 or greater. | |
| CR3000 (retired) | Requires OS version 32.04 or greater. | |
| CR310 | Requires OS version 10 or greater. | |
| CR350 | Requires OS version 10 or greater. | |
| CR6 | Requires OS version 10 or greater. | |
| CR800 (retired) | Requires OS version 32.04 or greater. | |
| CR850 (retired) | Requires OS version 32.04 or greater. |
Miscellaneous
| Product | Compatible | Note |
|---|---|---|
| Granite 10 | Requires OS version 2 or greater | |
| Granite 6 | Requires OS version 2 or greater | |
| Granite 9 | Requires OS version 2 or greater |
Downloads
TX325 Program Example for CR3000, CR1000, or CR800 Data Logger v.5 (3 KB) 30-10-2020
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.
TX326 and TX325 Program Example for GRANITE, CR6, CR1000X, or CR300 Data Loggers v.6 (5 KB) 18-10-2021
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.