IP Access is a young, fast-moving company based in Cambridge.  Formed in 1999, the company is a wholly-owned subsidiary of TTP Com with a focus to provide GSM over IP coverage solutions.

• RF Design of GSM radio solutions or DCS-1800 and PCS-1900 systems
• Prototype Designs for new GSM Access Point
• Type Approval and EMC Testing

Artimi Ltd is a fabless semiconductor company developing silicon solutions for high bandwidth wireless connectivity based on Ultra Wideband (UWB) technologies.

• System design and mathematical modelling
• Design and manufacture of system components 3-10GHz
• Design of various ultra wideband components
• Antenna Design

Airspec is committed to supplying systems that prevent runway incursions and to reduce runway occupancy time.  Braymill was instrumental in the writing the specification and development of the Ground Marker System as used by the Federal Aviation Administration.  The system is currently undergoing shake-down by the Surface Technology Assessment Product Team AND520 at the FAA's William J. Hughes Technical Center near Atlantic City.  Deployment of the system is planned mid 2003 at Concord (CCR) Airport in California.

• Performed a full technical appraisal of the Ground Marker concept
• Put forward a proposal including technical, program and financial aspects
• Managed development project including sub-contractors
• Produced Design Specification
• Developed prototypes on time within a short timeframe and within budget
• Software design and coding using high-level language
• Digital design using flash PIC, coding using high-level language
• Ongoing development includes 5GHz Telemetry Link

activeRF's product range includes location systems for personnel and other items in security applications.

• Performed a comprehensive study into the existing system, specifically the impact of the radio on overall performance
• Made recommendations and completed a detailed technical specification for a new FSK radio system including low cost transmitter and high performance receiver. This technical solution would give significantly improved performance in terms of range, immunity to blocking & interference such as from mobile telephones and provides a flexible radio architecture for the company's future product base
• Completed an initial design of an 868MHz FM Tx and high performance Rx
• Developed a DSP PC application written in C to receive and demodulate the AM RF signal from an existing tag at 433MHz. It measured various parameters such as power, frequency error and data-rate

ATR's product range include radio remote metering transmitters/receivers for the water, electricity and gas utility markets.

• Developed a DSP PC application written in C to receive and demodulate the FM RF signal from a tag, measure various parameters such as power, frequency error, data-rate and lock-time. This product proved invaluable in both a development and production environments.
• Mathematical modelling of system parameters to determine optimum battery-life and drive-by velocity 
• Defined performance requirements for a new product for the US market
• Performed a design appraisal for the 920MHz antenna matching circuit including Monte-Carlo analysis

Tality, formerly a division of Cadence Design Systems, are a global design centre with offices in Cambridge.  We were involved with one of their major projects developing an EDGE 2.5G metrosite base-station for GSM use.

• Designed & Developed an Advanced Transmitter Tester for GSM GMSK/EDGE Base Stations. This significant work package involved both RF and software design. The unit measured such parameters as Intermodulation Attenuation, noise and spurious levels to 12.75GHz. Two such systems was built, validated and commissioned. 
• Performed a complete design appraisal of the transmitter IF stages and made recommendations to improve performance 
• Matching & evaluation of Surface Acoustic Wave IF filters from various manufacturers 
• Modelled EVM performance of IF circuits using Agilent ADS simulation software
• Performed comprehensive testing over voltage & temperature extremes
• Documentation including Design and Test Reports

This client is a pioneer in the delivery of terrestrial  wireless broadband solutions.

• Completed a comprehensive suite of documentation for the UNII (5GHz), MMDS (2.5GHz) and WLL (3.5GHz) products.  This included overall system and module design and test specifications. This significant work package involved liaison with various departments including marketing, system design, DSP and production test
• Modelled system phase noise to determine the rms phase error contribution from two phase locked loops
• Investigated the system performance trade-offs between adjacent channel rejection and fade margin
• Design of 3.5GHz radio front-end for a wireless local-loop application (WLL) including antenna diversity switches, power amplifier and low noise receiver amplifiers
• Performed PCB layout using PADS software

Braymill Associates has been involved in various projects with Plextek; Europe's largest independent electronics design consultancy and specialising in communications. These projects include:

• Developed a strategy and a mathematical model (visual basic application) for cell planning for a VHF wireless remote metering system 
• Design of 5GHz frequency converters and synthesisers for use in a novel milli-metric broadband access system for Radiant Networks.  These designs was first modelled using Seranade, built and tested.  Two systems were built, one used continuously for system trials, the other for channel sounding
• Design of both transmitter and receiver IF circuits from 35MHz to 4GHz for use in a broadband access system
• Performed the system design for the IF circuits (750MHz) of an SDH modem for a large multi-national client Responsible also for the detailed design of the frequency selective diplexer, parts of the receiver chain and synthesisers
• Investigated suitability of existing radio technology for use in the Millennium Homes project

Navstar are now part of the Parthus group and provide GPS solutions.  Braymill Associates was asked to manage the Timetrack project which involved the design of an innovative tracking system with applications in commercial sporting events, tracking people, containers and even military training.  The system used three different radio technologies, GPS, UHF telemetry and VHF location tags.

• Project Management, including chairing weekly custom meetings, minutes and financial reporting to management, extensive use of MS Project
• Responsible for the design specification
• Instrumental in the introduction of all project drawings, BOMS etc
• System Design including trade-off between number of tags FDMA, TDMA, CDMA
• Mathematical modelling of the tag channel propagation, tag performance

Braymill Associates and its sister company Longbray Systems have been involved with various projects with companies in the Racal group including Bracknell, Washington DC (US) and Reading.

• Addressed several areas of the design of the Bowman VHF man-pack radio including receiver sensitivity, self-blocked channels and third order intercept performance
• Designed a 100Watt VHF harmonic Filter for use on the Bowman project
• Scopeshield; provided support in the UK and US for the design of a V/UHF handheld radio for the US Air Force and Military Police
• Developed a strategy for efficiently calibrating radio parameters in production test
• Design of a GPIB computer controlled system that allowed up to 48 hand-held radios to be simultaneously environmentally tested.

Working within the Electronic Warfare and Tactical Division of the Command Information Systems sector (DRA Malvern).  The work is of a classified nature, but involved RF design on sophisticated communications systems including:

• System definition including DDS and a broadband 200W PA, high power combiners
• Design of a fast, broadband 50W harmonic rejection filter with PIN diode switching
• Signal switching circuits
• System configuration software using parallel-C