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FM Broadcast Case Histories
As one of the world's leading manufactures of high-power FM Broadcast transmitters and support equipment, we're constantly pushing the limits to provide better and more reliable performance. Learn about how once again, we've covered new ground for our broadcast clients.

 
  Case Histories
You'll be surprsed to learn about the ways we've used RF technology to innovate some very impressive accomplishments:

FM Broadcast Case Histories
Shortwave Case Histories
LF Case Histories / VLF Case Histories
Science/Industry Case Histories
  Continental History
Long before founding Continental Electronics in 1946, our Founder J.O. Weldon was a leader in the RF industry. Over the ensuing 7-decades, Continental has continued to show the way. Learn how our work has literally defined the science and applications of RF technology.
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FM Broadcast Case Histories

 

802D FM Exciter

When introduced in 1997 Continental's 802D FM Digital Exciter leapfrogged the digital FM competition. The 802D produced an FM broadcast signal using digital signal processing (DSP) technology, but that was just the beginning. An industry standard PC motherboard was the foundation of the 802D. Use of the generic PC topology provided an open system architecture, expandability, and ease of use. The PC operating system controlled PC operation, diagnostics, user interface, and other background tasks but the 802D exciter firmware would continue to operate in the event of a motherboard failure!

The 802D used a powerful floating point DSP board, incorporating four Analog Devices SHARC tm (Super Harvard Architecture Computer) chips. The SHARCs performed the actual signal processing - FM generation, interpolation, stereo generation, pre-emphasis, composite processing, audio processing, SCA generation and filtering, etc. The use of floating point processors enabled the 802D1 to maintain high precision accuracy regardless of audio level. Due to truncation, conventional fixed point (integer) DSP chips would lose precision as a function of dynamic range.

The Continental 802D truly was a step beyond any other FM exciter at the time and the same innovation and design team that developed the 802D1 developed Continentals 802E and 802Ex digital FM & HD Exciters.

 

816HD Series Transmitters

Upon its introduction at the 2005 NAB Show the 816HD analog and IBOC single transmitter system was hailed as a “game changer” in digital broadcast development. Using low-level combining of analog and IBOC signals to eliminate the wasted heat generated by high-level combining techniques the first 816HD transmitter systems demonstrated Continentals focus on efficiency and a reduced system footprint. The first 816HD transmitters utilized the 4CX20000E tetrode and were designed for analog powers up to 22kW and 1% (-20dBc) HD power.
The 816HD-25 transmitter followed in 2007. Using the 4CX25000C tetrode, for improved cooling and higher analog power, the 816HD-25 can deliver up to 27.5kW of analog power with 1% HD.

 

816HD-28L Liquid Cooled FM/HD Transmitter

The 816HD-28L is a unique FM transmitter system that uses liquid cooling instead of forced air. As a result the transmitter can deliver more analog and HD power and still be quiet enough that you could have a softly spoken discussion in front of it. Water is the primary cooling liquid used in the cooling systems deployed to date because the systems are located either indoors or at warm enough latitudes to allow single stage systems. In cooler climates a dual heat exchanger system would be required to allow for distilled water to cool the tube and a glycol mix to transfer heat to an external heat exchanger.

 


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