TX325

Name: TX325
Brand: Campbell Scientific
SKU: 34948
Availability: InStock

Satellite Transmitter for GOES CS2/v2.0

TX325

Orderable

Satellite Transmitter for GOES CS2/v2.0

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Model:: TX325
Item Number:: 34948
Warranty:: 1 year

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.

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.

Key Advantages

New Standard for Reliability in GOES Transmitters
Smaller form factor, easy to use, and rugged

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/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.

Benefits

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

Specifications

Transmissions Supported: Timed
(Scheduled)
Random
Data Format: ASCII
(SHEF)
Pseudo Binary
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: < 2.5 A when transmitting
(typical 1.8 A at 12 Vdc)
< 5 mA standby
(typical 2.8 mA at 12 Vdc)
< 50 mA during GPS acquisition
(typical 25 mA at 12 Vdc)
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): 31 dBm maximum
Maximum EIRP is 41 dBm
(based on 11 dbm gain antenna and 1 dbm line loss)
Typical EIRP is 37 to 41 dBm.
Transmit Power (1200 baud): 37 dBm maximum
Maximum EIRP is 47 dBm
(based on a 11 dbm gain antenna with 1 dbm line loss)
Typical EIRP is 43 to 47 dBm.
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: 300 Baud 0.75 KHz
1200 Baud 2.25 KHz

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