Linearized VCO-based module is small, light, and frugal with power

Unique Narda dual-channel signal source digitally creates arbitrary waveforms, rapidly modifies their characteristics, and switches between channels in less than 15 ns

HAUPPAUGE, NY – April 28, 2008 - Narda, an L-3 Communications (NYSE: LLL) company, today introduced the Model 10512 programmable signal source that digitally creates frequency-modulated "noise" waveforms and applies them to a carrier whose center frequency can be varied +/-50 MHz in less than 100 ns. Its unique characteristics make it well suited for use as a fast-hopping signal generator, programmable noise source, or arbitrary signal generator.

Characteristics of the waveforms generated by the Model 10512, such as video bandwidth, dispersion bandwidth (to 400 MHz), and power level, can be programmed by the user or remotely by a host system. The waveforms include ramp, sinusoidal, triangle, square wave, and random, among others. The standard model operates to 3 GHz but much higher frequency ranges are available. It consumes only 11 W, measures 4 in. L x 4 in. W x 0.6 in., weighs less than 1 oz., and is rugged enough to meet military specifications for shock and vibration.

The Model 10512 employs two VCOs and a high-speed, PIN-diode-based single-pole, double-throw switch that allows it to change from one frequency to another at extremely high speed. One VCO can operate at one frequency in a band while the other is "staged" to operate at a higher frequency. By "ping-ponging" the two VCOs, it is possible to hop between frequencies much faster than by retuning a single VCO. While the tuning time for a single VCO is less than 100 ns, switching time between two retuned VCOs via the high-speed switch is less than 15 ns.

For adjusting signal amplitude, each channel utilizes a digitally-controlled attenuator (DCA) with 63 dB range that is controllable in 1-dB steps. The DCAs settle between any two states in less than 100 ns. The Model 10512 delivers +16 dBm RF output power with a 1-dB gain compression point of +21 dBm. The module exerts real-time control over all signal parameters, maintaining them within tight tolerances over a broad range of operating conditions.

The Model 10512 uses an FPGA to enable real-time temperature compensation and linearization. A linearization calibration table is stored for each of eight temperatures over the unit's operating range and a temperature sensor is read once per second. The FPGA performs tune count updates at 60 MSamples/s. The results are interpolated and applied to a digital-to-analog converter (DAC). This approach achieves ovenized-type temperature stability without the size and power consumption of an oven.

Generating the required modulation bandwidth typically requires a video filter whose output is scaled to achieve the required RF bandwidth. To accommodate numerous bandwidths, a switchable bank of filters is required, the output of each filter shaped to obtain uniform power spectral density. The Model 10512 uses a digital implementation of this approach. A pseudo-random number generator and linear feedback shift register (LFSR) generate a digital random sequence. The long LFSR output is passed through a digital low-pass filter bank and shaping is applied to create uniform distribution with a high-speed look-up table. A digital multiplier block provides programmable frequency excursions.

The standard Model 10512 has a frequency range of 2.8 to 3.2 GHz, but other frequencies can be accommodated well into the millimeter-wave region. Many other electrical and mechanical parameters can also be customized to meet the needs of customer requirements.

Please direct readers to Narda Microwave-East: www.nardamicrowave.com/east,
e-mail: nardaeast@L-3com.com, or (631) 231-1700 for more information.
Please note: The Model 10512 and many other examples of Narda's enhanced MIC capabilities will be displayed at IMS 2008.

About Narda Microwave-East

Narda Microwave-East is a division of L-3 Communications Company, a $14 billion electronics manufacturer serving the military and commercial communication markets. For over 50 years, Narda has developed and manufactured state-of-the-art RF and microwave components, microwave integrated circuits (MICs), multi-function assemblies, and subsystems in the frequency range from DC to 60 GHz for both commercial and military applications. Narda is also the world leader in RF safety products, and a leading manufacturer of fiber optic modulator drivers and oscillators for OC-192 and OC-768 applications. Narda maintains the world's largest inventory of RF and microwave components, many available from stock.

About L-3 Communications

Headquartered in New York City, L-3 Communications is a leading provider of Intelligence, Surveillance and Reconnaissance (ISR) systems, secure communications systems, aircraft modernization, training, and government services. The company is a leading merchant supplier of a broad array of high technology products, including guidance and navigation, sensors, scanners, fuzes, data links, propulsion systems, simulators, avionics, electro optics, satellite communications, electrical power equipment, encryption, intelligence systems, antennas and microwave components. L-3 also supports a variety of Homeland Security initiatives with products and services. Its customers include the Department of Defense, Department of Homeland Security, selected U.S. Government intelligence agencies and aerospace prime contractors.

SAFE HARBOR STATEMENT UNDER THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995

Except for historical information contained herein, the matters set forth in this news release are forward-looking statements. Statements that are predictive in nature, that depend upon or refer to events or conditions or that include words such as "expects," "anticipates," "intends," "plans," "believes," "estimates" and similar expressions are forward-looking statements. The forward-looking statements set forth above involve a number of risks and uncertainties that could cause actual results to differ materially from any such statement, including the risks and uncertainties discussed in the company's Safe Harbor Compliance Statement for Forward-looking Statements included in the company's recent filings, including Forms 10-K and 10-Q, with the Securities and Exchange Commission. The forward-looking statements speak only as of the date made, and the company undertakes no obligation to update these forward-looking statements.