TEMPE, Arizona, April 16, 2007 – Comtech EF Data Corporation announced today that it completed operational testing in conjunction with L-3 Communications NARDA Satellite Networks (NSN) and XTAR, LLC.  The testing was conducted at the Joint Interoperability Test Command (JITC) in Indian Head, Maryland, and encompassed Comtech EF Data’s SLM-5650 Satellite Modem, L-3 Communications’ (NSN) Ground Multi-band Terminal (GMT) System and 3.9 Meter Transit-Case Quad-Band Antenna utilized by the armed forces, and XTAR, LLC’s high power X-band satellite system.

The SLM-5650 Satellite Modem operated effectively at 155 Mbps with 7/8 rate Turbo Product Coding forward error correction and 8-PSK modulation over XTAR’s XTAR-LANT satellite, located at 30° West, utilizing both 2.4 and 3.9 meter antennas.

Based on the success of the testing at the JITC, the Air Force's Air Combat Command requested similar testing of the SLM-5650 at Langley Air Force Base.  This testing produced similar results to those at Indian Head.

“These operational tests confirmed the SLM-5650’s ability to support high data rate applications in a variety of military environments, including fixed, at-the-pause and on-the-move,” said Daniel Enns, senior vice president strategic marketing and business development, Comtech EF Data.

L3 Communications’ (NSN) GMT System and 3.9 Meter Transit-Case Quad-Band Antenna is capable of operating over the commercial C- / Ku-band frequencies, X- / Ka military frequencies, the XTAR X-band satellite and the Government’s Defense Satellite Communications Systems (DSCS).  The GMT terminal including the 2.4 Meter High Wind Antenna and 3.9 Meter Lightweight Medium Aperture Antenna (LMAA) equipment kits is contained in weatherproof transit cases when packaged for transit.  The terminal is designed for repeated worldwide tactical deployment.

XTAR, LLC is the world’s first satellite system designed specifically to provide commercial X-band services exclusively to government users.  The XTAR system’s high-powered steerable beams provide much-needed X-band capacity and flexibility to U.S. and Allied forces in theaters of operation.  XTAR service is also backwards compatible with existing X-band terminals and infrastructure.  XTAR’s high power transponders allow all users, including those with small and/or legacy terminals to receive and transmit data at demonstrably higher rates than previous X-band capacity.

Comtech EF Data’s SLM-5650 Satellite Modem complies with the strict requirements of the DSCS defined in Military Standard (MIL-STD)-188-165A, modem types I, II, IV, V and VI.  This high-speed modem supports data rates up to 155 Mbps, and offers flexible interfaces including Gigabit Ethernet, advanced forward error correction and higher order modulation.  It is compact and rugged, ideally suited for many government and military applications.

About L-3 Communications

Headquartered in New York City, L-3 Communications employs over 63,000 people worldwide and is a prime system contractor in aircraft modernization and maintenance, C3ISR (Command, Control, Communication, Intelligence, Surveillance and Reconnaissance) systems and government services. L-3 is also a leading provider of high technology products, subsystems and systems. The company reported 2006 sales of $12.5 billion. To learn more about L-3, please visit www.L-3Com.com.

About XTAR, LLC

XTAR, LLC is a private, U.S owned and operated company selling X-band services to support both U.S. and Allied government users. The high-powered global, fixed and steerable beams on XTAR’s two satellite payloads provide essential, flexible, real-time X-band capacity with coverage anywhere from Denver east to Singapore. XTAR’s satellites offer “on-the-move” capability for mobile command posts, security and disaster response, as well as small ships and airborne relayed sensor data. Visit www.xtarllc.com for more information.

About Comtech EF Data Corporation

Certain information in this press release contains statements that are forward-looking in nature and involve certain significant risks and uncertainties. Actual results could differ materially from such forward-looking information. The Company's Securities and Exchange Commission filings identify many such risks and uncertainties. Any forward-looking information in this press release is qualified in its entirety by the risks and uncertainties described in such Securities and Exchange Commission filings.

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Media Contact:
Sue Wilcox
Comtech EF Data
Voice: 480.333.2200
Fax: 480.333.2540
swilcox@comtechefdata.com