It's clear that Sinclair Technologies synchronizes its business around telecommunications technologies. The company manufactures a variety of components, including fixed and mobile wireless network antennas, filters, receiver multicouplers, and transmitter combiners for more than 1,500 customers. Its products are used for mobile radio, public safety, military, cellular, and transportation applications. Sinclair Radio Laboratories was founded in 1951 by George Sinclair, an engineering professor at the University of Toronto; in the 1960s the firm designed antennas used on Gemini spacecraft. The company is owned by the three daughters of the founder, who died in 1993. It became Sinclair Technologies in 1995.

SK Telecom, a member of the SK Group chaebol, is the #1 wireless communication services provider in South Korea in terms of subscribers. The company serves about 24 million mobile customers (50% of the domestic market share). In addition to cellular and wireless data services, the company provides broadband Internet access through a controlling stake in the #2 South Korean alternative local-exchange carrier and ISP SK Broadband. It also offers international, long distance, computer, and business telephony services (SK Telink); mobile satellite video broadcasting (TU Media); and it operates Internet portal NATE.com. SK Telecom has international offices in Beijing, Ho Chi Minh City, Jakarta, London, and Tokyo.

SkyCross makes sure that wireless signals don't get crossed. The company designs and makes antennas for a wide range of wireless applications, including cellular phones, wireless broadband (UWB), wireless LANs, and global positioning systems (GPS). The firm uses Meander Line Antenna (MLA) technology originally developed for military applications by BAE Systems. SkyCross has offices in China, South Korea, and the US. The company was founded in 2000.

SkyCross makes sure that wireless signals don't get crossed. The company designs and makes antennas for a wide range of wireless applications, including cellular phones, wireless broadband (UWB), wireless LANs, and global positioning systems (GPS). The firm uses Meander Line Antenna (MLA) technology originally developed for military applications by BAE Systems. SkyCross has offices in China, South Korea, and the US. The company was founded in 2000.

SkyFiber takes data up, up and away. The company (formerly Dominion Lasercom) develops wireless telecommunications technology that uses a line-of-sight system to optically send and receive data by means of infrared LEDs or lasers, photo detectors, and optic lenses. This method of data transmission is intended to enable the construction of communications networks in instances where building traditional infrastructure requiring cell towers or underground cabling is cost- or time-prohibitive. SkyFiber targets customers in the telecom, defense, education, and health care markets among others. Applications include corporate or educational campus communications networks.

SOFTBANK MOBILE is one of the leading wireless carriers in Japan where industry stalwarts NTT DoCoMo and KDDI preside in the mobile space. The mobile communications company provides wireless voice, data, and Internet services under the White and S! brands to about 20 million subscribers throughout the island nation. It also serves about 16 million customers with wireless Internet connections. SOFTBANK MOBILE distributes wireless handsets and accessories made by a range of mobile device manufacturers including Nokia, Panasonic, and Toshiba. The company is a subsidiary of investment firm SOFTBANK CORP which owns stakes in about 60 companies.

SOMA Networks knows that the communications industry doesn't sleep. The company is a manufacturer of WiMAX wireless networking equipment used by local telephone companies and Internet service providers. SOMA's products include network base stations, wireless modems, and software products that enable carriers to connect residential and business broadband subscribers to their networks. The company has sales agreements with communications products integrators including Cadmus and Zentek. SOMA, founded in 1998, counts Mizuho, Daiwa Securities, Ridgeway Capital Partners, and Sharp Corporation among its investors.

Sonim Technologies makes products that make mobile voice- over-IP communications better. The company manufactures servers and software that allow mobile wireless carriers to provide features like push-to-talk (walkie-talkie) and direct voice messaging. The company has also produced a rugged GSM mobile phone designed for use in harsh environments. Founded in 1999, the company is headquartered in San Mateo, California, and has additional offices in India, Italy, Sweden, and the UK. It has also acquired a software development center in Bangalore, India. Investors include 3i, Accel Partners, Apax Partners, and BV Capital.

Sony Ericsson Mobile Communications wants to build a better voice trap. The joint venture between Japan-based consumer electronics maker Sony and Sweden-based Ericsson combines the cell phone operations of both companies. It was established to draw on the wireless technology of Ericsson, the world's leading maker of wireless network equipment, and Sony's expertise in developing popular consumer gadgetry; the companies phased out their separately-branded phones in favor of co-developed models. Sony Ericsson is squared off against such cell phone stalwarts as Nokia and Motorola, as well as Samsung. Sony and Ericsson each own half of the venture, which was founded in 2001.

Spectrum Signal Processing's devices and software address a spectrum of signal processing needs. The company offers signal processing subsystems and software-defined radio transceiver devices used in a variety of applications, including cellular base stations, signals intelligence, military communications, and test and measurement equipment. Spectrum discontinued its line of voice-over-packet products, which were designed for telecommunications functions. Top customers include Agilent, General Dynamics, Lockheed Martin, Raytheon, and the US Department of Defense. The company has offices in Canada, the UK, and the US. Spectrum Signal Processing is a unit of Vecima Networks.

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