TX325

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.

This featured product was part of the Aconcagua expedition to install a weather station on South America’s tallest peak. Learn more about the expedition on our Extreme Application Series: Aconcagua page.

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/CR1000Xe RS-232/CPI port, select the 31056 as an accessory.
• To connect the TX325 to the COM (C, U) ports of a data logger, select the SC110 as an accessory.
• To connect the TX325 to the 9-pin RS-232 port of a data logger, select the 35688 as an accessory.