DGPS Systems


SC Series

The SC Series Reference Station Transmitter combines the reliability and cost effectiveness of low frequency radio transmitters with third-party DGPS equipment to transmit Differential GPS correction data.

The SC Series transmitter amplifies signals generated by an external GPS Receiver and Reference Station. The SC Series Reference Station also incorporates an integrity monitor that allows external monitoring and control of the system and associated electronics.

The transmitter uses switching technology in the power amplifiers and modulator/regulator modules resulting in a highly efficient system. No additional software is required to monitor the SC Transmitter over the Ethernet.

Southern Avionics currently offers three models of the SC Series DGPS systems. Click below for more details.

DGPs-edit

SC1000A DGPS

Carrier power adjustable from 50 to 1000 Watts
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SC500 DGPS

Carrier power adjustable from 50 to 500 Watts
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SC200 DGPS

Carrier power adjustable from 10 to 200 Watts
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SC1000A

Features

  • RSIM/Transfer Control System
  • Meets FCC & USCG requirements
  • Built-in Battery Standby
  • 24 Binary Control States
  • 40 Binary Monitor States

The SC1000A Differential GPS transmitter allows carrier power adjustment from 50 to 1000 Watts. The transmitter uses switching technology in the power amplifiers and modulator regulator resulting in a highly efficient system in a relatively small package.

The exciter portion of the transmitter consists of an MSK Interface board which accepts a 283.5 kHz to 325 kHz sine wave input signal ranging from 0 to 15 dBm.  The MSK Interface board squares, monitors and distributes this signal to the power amplifiers.

The completely redundant RF power sections of each drawer consists of independent 1000 Watt assemblies. Each 500 Watt sub-assembly has an output filter, a switching power amplifier, and switching modulator/regulator. The RF output of each sub assembly is combined to provide a 1000 Watt signal to the Antenna Coupler.

The SC1000A also contains a Renesas microprocessor controlled Automatic Transfer Unit / RIM Controller, Interface I/O panel and an RF output panel housed in a single 19-inch rack cabinet.

The RIM Controller uses RSIM commands which allow the unit to control up to 24 external devices, through relay contacts, monitor up to 40 external devices such as intrusion alarms, temperature and humidity sensors, log Built In Test Equipment data and communicate with a Reference Station using an Ethernet ready interface.

The RIM Controller provides continuous monitoring of critical parameters to the Reference Station such as Forward and Reflected Power, VSWR, Antenna Current and system faults.

The SC1000A works in conjunction with the PV1000 Antenna Coupler to provide a near perfect Resistive Match and Series Resonant Tune point for the antenna system utilized.  As antenna system resistance changes throughout the day, the SC1000A and PV1000 work together to maintain a constant field strength output from the antenna, when the transmitter is set to Automatic Level Control mode.

How does the SC1000A differ from previous versions? 

 

1. We significantly improved the RSIM drawer:

SC1000 (pre 2010) SC1000A (current)
Large quantity of plug-in PCB’s RSIM motherboard now incorporates all control relays, monitor state isolators, transmitter metering and system calibration. The microprocessor, a powerful MC16C series Renesas platform, is mounted on a separate PCB.  No extender cards required
Microprocessor, 68HC11 series, must be removed from system to upgrade firmware Master Controller PCB allows for firmware upgrades without the need to remove the microprocessor.
No visual monitoring of RSIM commands or system parameters. Contains no BITE information 4 line by 40 character LCD makes setup and monitoring of system BITE information easy to view
All system adjustments, i.e. RF Power, Low Power shutdown level and VSWR shutdown level, require entry into transmitter via  manual adjustment System functions such as power level adjustment are carried out on the front panel’s keypad
External communication on RS422/RS232 only Communication is accomplished with an internal RS485 to Ethernet converter making the transmitter “Network Ready” for ease of interface and control
ATU communication analog only RS485 port added to allow communication with a modern “Intelligent ATU”
Power level fluctuations due to line voltage and environmental changes Added Automatic Level Control  (ALC) provides a stable power level when used with SAC’s Intelligent ATU and ALC is engaged
ATU setup and adjustments made at ATU Intelligent ATU can be adjusted using the transmitter’s front panel keypad controls

 

2. We improved several other features overall:

SC1000 (pre 2010) SC1000A (current)

Housed in a fixed 30 Rack Unit Cabinet.

Only 9 Rack Units available for customer equipment

Housed in a 36 Rack Unit Cabinet with casters for easy movement and installation

18 Rack Units Available for Customer’s DGNSS Equipment

24 VDC battery stack needed as well as 144 VDC battery stack

Only 144 VDC battery stack is needed

Requires 144VDC inverter and Load Center

DC Inverter and Load Center Eliminated

Large open power relays for AC/DC control and RF transfer

More reliable Solid State relays used to control AC

Internal point to point RSIM to Transmitter drawer wiring

Internal RSIM to Transmitter drawer wiring changed to DB25 style cables providing improved maintenance capability

 

3. The SC1000A works with our new PV1000 Intelligent ATU

PC1Kilo USCG ATU PV1000 Intelligent ATU

Automatically compensates only for a change in antenna capacitance

Can compensate for changes in antenna capacitance and ground resistance

Changes in resistance made manually with jumpers in fixed Impedance Tap steps

Resistance changes are adjusted for automatically using SAC’s “L Match” technology. This technology allows for continuously variable resistance compensation

Only a spark gap is available for lightning protection

Adjustable spark balls, 1 to 1 isolation transformer and I/O surge protection board comes standard

No solar loading prevention mechanism available

ATU comes standard with mounting holes for an optional top mounted solar shield

SC500

Features

  • RSIM/Transfer Control System
  • Meets FCC & USCG requirements
  • Built-in Battery Standby
  • 24 Binary Control States
  • 40 Binary Monitor States

This Differential GPS transmitter has carrier power adjustable from 50 to 500 watts. The transmitter uses switching technology in the power amplifiers and modulator/regulator modules resulting in a highly efficient system in a relatively small package.

The exciter portion consists of an interface for a 283.5 to 325 kHz input signal 0-15 dBm and a monitor circuit.

The power portion of each transmitter consists of an independent 500 watt system. Each system has an output filter, a switching power amplifier, and switching modulator/regulator.

The SC500 has the ability to operate with dual antennas and ATU’s. Antenna selection is either done locally or through a RSIM command.

The SC500 Dual consists of two independent SC500 transmitters and an Automatic Transfer Unit / RSIM Controller designed for mounting in a standard 19 inch rack cabinet.

For use with the PV1000 Antenna Tuning Unit

Also, below is the list of SC200 / 500 attributes that are improvements over the SC1000…

The new SC has a number of features: 

  • Universal Input power supply. No setting jumpers for different parts of the world.
  • New switching power supplies make the new SC much lighter than the old SC
  • The front panel LCD gives the customers immediate feedback on the operation of the transmitter
  • Ethernet helps the customer monitor and control the system from multiple remote terminals or virtually any computer in the world using Internet.
  • New shielded RF assemblies and coaxial relays help the new SC meet more stringent requirements.
  • New sealed membrane keyboard with 10,000,000 key-press capability replaces old keys that got dirty.
  • New external Analog Inputs gives customers access to external signal monitoring at transmitter site.
  • New microprocessor “heartbeat circuit” monitors system operation to comply with CAP670 requirements
  • More powerful Renesas Microcontroller gives customers greater flexibility on operations
  • New modern indoor enclosure has greater EMC capability and smoked glass front door
 
 

SC200

Features

  • RSIM/Transfer Control System
  • Meets FCC & USCG requirements
  • Built-in Battery Standby
  • 24 Binary Control States
  • 40 Binary Monitor States

This Differential GPS transmitter has carrier power adjustable from 10 to 200 Watts. The transmitter uses switching technology in the power amplifiers and modulator/regulator modules resulting in a highly efficient system in a small package.

The exciter portion consists of an interface for a 283.5 to 325 kHz input signal 0-15 dBm and a monitor circuit.

The power portion of each transmitter consists of an independent 200 watt system. Each system has an output filter, a switching power amplifier, and switching modulator/regulator.

The SC200 has the ability to operate with dual antennas and ATU’s. Antenna selection is either done locally or through a RSIM command.

The SC200 Dual consists of two independent SC200 transmitters and an Automatic Transfer Unit / RSIM Controller designed for mounting in a standard 19-inch rack cabinet.

Also, below is the list of SC200 / 500 attributes that are improvements over the SC1000…

For use with the PC1000C/3 Antenna Tuning Unit.

img_productdetail-sc200-dgps-b
img_productdetail-sc200-dgps-c

The new SC has a number of features: 

  • Universal Input power supply. No setting jumpers for different parts of the world.
  • New switching power supplies make the new SC much lighter than the old SC
  • The front panel LCD gives the customers immediate feedback on the operation of the transmitter
  • Ethernet helps the customer monitor and control the system from multiple remote terminals or virtually any computer in the world using Internet.
  • New shielded RF assemblies and coaxial relays help the new SC meet more stringent requirements.
  • New sealed membrane keyboard with 10,000,000 key-press capability replaces old keys that got dirty.
  • New external Analog Inputs gives customers access to external signal monitoring at transmitter site.
  • New microprocessor “heartbeat circuit” monitors system operation to comply with CAP670 requirements
  • More powerful Renesas Microcontroller gives customers greater flexibility on operations
  • New modern indoor enclosure has greater EMC capability and smoked glass front door
img_productdetail-sc200-dgps-a

 Phone

Direct: 409-842-1717
Fax: 409-842-2987

 Email

Sales Inquries: sales@southernavionics.com 

Technical Inquries:  techdept@southernavionics.com