This product is no longer available and has been replaced by: TX321.
TX312 High Data Rate GOES Transmitter
Services Available
Repair No
Calibration No
Free Support No


The TX312 is a satellite transmitter that uses the GOES satellite system to provide one-way communications from a data collection platform (DCP) to a receiving station. The TX312 complies with the High Data Rate (HDR) specifications and supports transmission rates of 100, 300, and 1200 bps.

Note: Services and support are no longer available for the TX312. 

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Benefits and Features

  • NESDIS certification in process
  • Automatic GPS correction of clock and oscillator drift
  • Operates up to 28 days between GPS fixes
  • Independent self-timed and random data buffers
  • Diagnostics and status information can be sampled by the data logger and transmitted as part of the data stream
  • Available on GSA MAS Contract Number GS-25F-6042D
  • Readily added or retrofitted to existing Campbell Scientific systems
  • Non-volatile setups configured with Windows-based software


Detailed Description

The TX312 uses the GOES satellite system to provide one-way communications from a data collection platform (DCP) to a receiving station. This satellite transmitter complies with the High Data Rate (HDR) specifications. Supported transmission rates are 100, 300, and 1200 bps. Because clock accuracy is critically important for GOES satellite telemetry, the TX312 includes a robust, TCXO-based real-time clock and a GPS receiver. The TX312 is compatible with most of our data loggers. (See the Compatibility information.)

GOES System

The GOES system is administered by the National Environmental Satellite Data Information Service (NESDIS). NESDIS assigns addresses, uplink channels, and self-timed/random transmit time windows. Self-timed windows allow data transmission only during a predetermined time frame. Random windows are for applications of a critical nature (e.g., flood reporting) and allow transmission immediately after a threshold has been exceeded.

TX312 and SAT HDR GOES Comparison

The TX312 replaced the SAT HDR GOES in 2005. The TX312 provides the following advantages over its predecessor, the SAT HDR GOES:
  • Up to 28 days of operation between GPS fixes
  • Every unit tested by Campbell Scientific in an environmental chamber to ensure the unit operates within specifications
  • Additional LEDs that indicate transmitter’s operation
  • Easier to use Windows-based software for configuring the non-volatile setups


Operating Voltage Range 10.8 to 16 Vdc
Supply Current @ 12 Vdc
  • 5 mA (at idle)
  • 2.6 A (during transmission)
Transmission Data Rates 100, 300, and 1200 bps
Channel Bandwidth
  • 1.5 kHz (@ 100 bps transmission rate)
  • 1.5 kHz (@ 300 bps transmission rate)
  • 3.0 kHz (@ 1200 bps transmission rate)
Output Power Complies with NESDIS DCPRS Certification Standards, Section 4. For 1200 bps, it has a nominal EIRP of 51 dBm and a maximum EIRP of 53 dBm, assuming appropriate antenna. For 100/300 bps, it has a nominal EIRP of 48 dBm and a maximum EIRP of 50 dBm, assuming appropriate antenna.
Frequency Range 401.7 MHz to 402.1 MHz
Dimensions 27.7 x 5.3 x 16.2 cm (10.9 x 2.1 x 6.38 in.)
Weight 0.95 kg (2.1 lb)


Setting Accuracy ±100 µs (synchronized to GPS)
Drift ±10 msec/day (over -40º to +60ºC)
GPS Schedule 1 fix at power up, 1 fix per day afterwards
Transmission Continuation without GPS Fix 28 days

Frequency Stability

Initial Accuracy ±20 Hz disciplined to GPS
GPS Schedule 1 fix at power up, 1 fix per day afterward
Short-Term Drift ±0.04 Hz/seconds
Aging ±0.1 PPM/year
Vcc + Temperature ±0.1 PPM


Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.

Data Loggers

Product Compatible Note
21X (retired)
CR10 (retired) The CR10 requires a special PROM.
CR1000 (retired)
CR10X (retired)
CR200 (retired)
CR200X (retired)
CR205 (retired)
CR206 (retired)
CR206X (retired)
CR210 (retired)
CR211 (retired)
CR211X (retired)
CR215 (retired)
CR216 (retired)
CR216X (retired)
CR23X (retired)
CR295 (retired)
CR295X (retired)
CR3000 (retired)
CR500 (retired)
CR5000 (retired)
CR510 (retired)
CR800 (retired)
CR850 (retired)
CR9000 (retired)
CR9000X (retired)

Additional Compatibility Information

Environmental Enclosure

The TX312 transmitter should be housed in an ENC16/18 environmental enclosure. Customers can order the 19332 and 19336 Antenna Cable/Bulkhead accessories to have Campbell Scientific punch a special bulkhead hole in the enclosure and install 17” cables for the Yagi and GPS antennas.

Power Supply

Typical power supply is a BP12 12 Ahr or BP24 24 Ahr battery, CH100 regulator, and an SP10 or SP20 solar panel. A user-supplied deep-cycle rechargeable battery should be used when it is difficult to replace the batteries or the system's power requirements are large. The deep-cycle rechargeable battery should have at least a 60 Ahr capacity, and be trickle-charged with an 20 W solar panel.


Sat Commander v.11.3.8 (3.78 MB) 03-08-2011

TX312 Support Software.

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