Stevens SatComm

The Stevens SatComm GOES transmitter sends data via the GOES Data Collection System (DCS) at both 300 and 1200 baud data rates. It can operate with any data logger capable of exporting data packets through a serial port in any format designated by the logger and permitted by NOAA/NESDIS.

For even simpler and more cost-effective remote GOES-based monitoring stations, Stevens SatComm is also available with an optional internal data logger, adding the ability for sensors to be directly connected for data collection, storage and transmission with a single low-power device.

  • NESDIS CS2/v2.0 certified
  • Compatible with most 3rd party data loggers
  • Two data logger input modes:
    • Continuous listen to data logger mode
    • Trigger mode using CTS “clear to send”, with programmable advance turn-on time
  • Two-way communication port
  • Available with integrated data logger (4 analog, 1 pulse and 12 SDI-12 sensor inputs, 1 control output)
  • VSWR measurement ensures proper antenna connection after installation, and alerts you of potential problems proactively

Stevens SatComm is fully compatible with most 3rd-party data loggers (connection via standard RS-232 port) or can be configured with an optional integrated data logger, allowing for basic data collection tasks and data transmission to be performed within one compact unit.

RELIABILITY for your most critical data

Stevens SatComm uses a TCXO (temperature compensated crystal oscillator) to provide exceptional power efficiency, minimal frequency aging and unsurpassed longevity.

Unlike OCXOs (oven-controlled crystal oscillator) typically used, a TCXO:

  • reduces the overall power consumption by eliminating a high current oven, eliminating the time and need for warm-up
  • is not vulnerable to breaking due to power cycling
  • maintains frequency over time without drift
  • minimizes the risk of station failure due to constant power-cycling, and ensures that transmissions always occurs within assigned timeslot.

User-selectable station health status information can be prepended to each transmission (battery voltage, message number, lat/long, VSWR, internal temperature, etc.), allowing remote alerting of potential problem conditions.

Data redundancy allows previous data set to accompany the current data set, increasing the chance of data retrieval even if a transmission is lost.

Two secondary COM ports (Touchscreen port and DCP Command port) allow dual telemetry (cellular, Inmarsat, Orbcomm, Iridium, etc.) for redundancy and 2-way remote station configuration and diagnosis.

VERIFY ANTENNA SIGNAL QUALITY, BEFORE YOU LEAVE THE SITE

VSWR measurement ensures good connection and signal path from the SatComm’s RF output to the antenna before the technician leaves the remote station. VSWR is continuously monitored as well, to protect expensive equipment in the event of damage to the RF connections, cabling, or antenna.

Technical Specifications

Power requirements

Input voltage range 10.5 to 16 VDC
Quiescent
During GPS acquisition 350 mA
300 BPS transmission 2.4 A (3 W max. with V2TH antenna)
1200 BPS transmission 3.5 A (10 W max. with V2TH antenna)

Maximum output power

300 BPS transmission 34.77 dBm (3 W max.)
1200 BPS transmission 40.0 dBm (10 W max.)

External interfaces

Computer interface USB type-B
External logger DB9-m connector interface
External touchscreen DB9-f connector interface
DCP command DB9-f connector interface
LED indicators Transmit, receive, failsafe, power, GPS lock status, built in self test (BIST)

Timekeeping

Transmission timing accuracy Meets NESDIS specifications
GPS time accuracy Within 0.01 s (10 ms) UTC

Certified antennas

Stevens V2TH +5.5 dBic gain, RHCP
Stevens V4TH +10 dBic gain, RHCP
Stevens Yagi +11 dBic gain, RHCP

Data transmission

Reporting Self-timed or random reporting
Format ASCII or pseudo binary

Physical

Temperature -40° F to +149° F (-40° C to +65° C)
Humidity 0 - 95% relative humidity non-condensing
Dimensions (W x L x H) 4.625” x 8.81” x 2.096” (11.75 x 22.38 x 5.32 cm)
Length Including mounting plate 7.169”, face-to-face

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