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SAC Blog

Southern Avionics Navigation Blog

In-Band Frequency Change: SA vs SE Series

Posted by Tara Trevino on Wed, Dec 18, 2013 @ 08:00 AM

With the introduction of the SE Series NDB Transmitters there have been some questions about how the new series compares with the older SA Series.

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Topics: NDB, Non-Directional Beacon, Aircraft Navigation, Beacon, SE Series, NDB transmitter

NDB Improvements: SA vs. SE

Posted by Tara Trevino on Wed, Aug 01, 2012 @ 12:46 PM

Southern Avionics is committed to continually improving our products and services. We have recently added an Online Store, a new Client Support Site with numerous resources for our customers and we added a new NAVTEX product line and extended our DGPS transmitter line. SAC is also moving on to our next generation of Non-Directional Beacon Transmitters, the SE Series.

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Topics: NDB, Non-Directional Beacon, Aircraft Navigation, Beacon, SE Series, NDB transmitter

NDB System Training with our Visitors from Indonesia

Posted by Tara Trevino on Thu, Dec 01, 2011 @ 11:32 AM

Over the Thanksgiving holidays, we had 13 visitors from Indonesia visit our headquarters here in Beaumont, TX. We gave them a small tour of Southeast Texas and had a great time!

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Topics: NDB, Non-Directional Beacon

NDBs: Why You Should Invest in SAC's Products (Part 2)

Posted by Tara Trevino on Mon, Oct 24, 2011 @ 09:38 AM

Welcome back to Part 2 of this blog on why you should invest in SAC's NDBs and related equipment.

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Topics: NDB, Non-Directional Beacon, Navigation

NDBs: Why You Should Invest in SAC's Products (Part 1)

Posted by Tara Trevino on Mon, Oct 10, 2011 @ 03:25 PM


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Topics: NDB, Non-Directional Beacon, Aircraft Navigation

Product Spotlight: SE Series NDB Transmitters

Posted by Tara Trevino on Mon, Sep 26, 2011 @ 08:34 AM

Latest and Greatest from SAC:

SE Series 125-Watt NDB Transmitter

The SAC Team would like to introduce to our blog readers one of our most prized possessions. Here is the SE125  NDB Transmitter from the SE Series!

Here is a quick run down of its features:
  • 125-Watt carrier powerProgrammable for any frequency from 190-650 KHz
  • Optionally Programmable from 650 to 1250 kHz and 1500 to 1800 kHz

  • Operations can easily be controlled at the front panel without the use of a computer

What makes the SE Series standout from our competitors?

Ethernet Control and Monitoring Option:
  • Local and Remore operation using a PC

  • Embedded web server - NO SOFTWARE TO LOAD

  • Server or User Definable IP address accessible by local PC or Ethernet connection

The SE transmitter also includes a comprehensive Built-In Test Equipment (BITE) section. From the comfort of the customer's computer terminal, troubleshooting the SE series of NDB's has never been easier. By using the technical manual provided with the NDB, a problem can be diagnosed to module level.

These facts combined with the quality and customer service reputation of SAC are what makes this non-directional beacon transmitter the NEW INDUSTRY STANDARD.

See our website for specsbrochures, and additional options available to you and your company. 

Connect with us! or email for more information on this and other products.

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Topics: NDB, Non-Directional Beacon, NDB transmitter

What is an NDB or Non-Directional Beacon?

Posted by Brooks Goodhue on Thu, Apr 28, 2011 @ 03:34 PM

What is an NDB?

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Topics: NDB, Non-Directional Beacon, Marine Navigation, Aircraft Navigation

What is DGPS or Differential GPS?

Posted by Brooks Goodhue on Wed, Mar 09, 2011 @ 03:28 PM

What is Differential GPS (DGPS) and why could it be important to you?

GPS systems have created the most accurate positioning systems in human history.  The system in  your car knows when you come to the corner and which way to turn. But even with that precision, there are applications that would benefit from even more exact positioning measurements. For example, a trucking company might like to know on which side of the street their vehicle is parked. That is where DGPS comes in.

Why is there variation anyway? It works out that small errors creep into the measurement and the resulting calculation. GPS systems measure the time it takes for a signal to travel from a satellite to a target ground unit. In order to get a completely accurate reading four satellites are used for the positioning measurement and the results are triangulated to get the exact position of the target.     

GPS satellites are approximately 12,500 above the earth’s surface, and the signal must pass through some atmospheric levels, particularly the ionosphere and troposphere, that introduce very minor variations in the time to send data from the targeted ground unit to the satellite. Because the signals travel at the speed of light, and the speed of light is over 186,000 miles per second, small errors can create huge discrepancies. For example, a delay of one millionth of a second would result in a mistake in
positioning of about 300 meters. DGPS adjusts for that error.

DGPS addresses this issue by placing a DGPS ground reference station transmitter in a precisely known position. The DGPS system then calculates the difference between the GPS calculated position for the ground reference station and the actual position of the ground reference station. This difference is then applied to any target in the neighborhood where you wish to measure a more accurate position.

The accuracy of the DGPS receivers will degrade as the ground reference station is further from the target you are measuring. However, if the DGPS ground reference station is within even 150 miles of the target you are measuring, it is close enough to refine the measured position of the target.  
Depending on how timely the positioning requirement is, DGPS can be real time, calculated as the system measures the position of the target or it can be done after the fact by correcting the positions of one or more targets.     

As the use of DGPS systems becomes more prevalent and less expensive, they become more valuable to every day users. Clearly the military requires very precise measurements across their battle scene.  The DGPS receiver system run by the US and Canadian Coast Guards that guides shipping, especially in harbor as they maneuver. But other private users can find the increased accuracy useful as well.     

As these DGPS beacon systems become even more accurate and available to the general public, they will affect many things. Imagine your car driving itself because your DGPS knows how close the adjacent cars are.

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Topics: DGPS, Differential GPS Reference Station, dgps beacon, dgps receiver, marine dgps, aircraft dgps

Welcome to the Southern Avionics NDB and DGPS Blog

Posted by Brooks Goodhue on Fri, Feb 25, 2011 @ 11:56 AM

Welcome to the Southern Avionics Company corporate blog.  Southern Avionics is a recognized leader in the field of navigational transmitters such as low frequency Non-Directional Radio Beacons and DGPS Reference Station Transmitters.

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Topics: NDB, Non-Directional Beacon, DGPS, Marine Navigation, Differential GPS Reference Station, Aircraft Navigation

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