Having seen so many products where the electrical performance has been limited by poor pcb layout design, I always include the lay-out as part of my work..…

Summary  Thirty years continuous experience in the design and development of HF, VHF/UHF and microwave radio circuitry, usually as part of a small development team. I prefer taking a product from concept right through to production and beyond where possible, and most of my previous work has reflected this. I tend to be 'hands on' and approachable, and am still driven by my basic enthusiasm for radio engineering.

Eastern analog and rf Ltd (1999 - ) My own company, set up after taking redundancy from Simoco. Work is two thirds consultancy

• Occasional Artevea visits to resolve RF issues on their Tetra Base terminals
• Occasional Eltek visits to resolve RF issues on their wireless data-loggers
  
• 2 months characterisation testing of development UWB chip at Artimi
  
• Design of DRM MW transmitters to replace the current low power AM variants that my company sells in small quantities.
  
• 18 months GIS Ltd. Hardware design and software-liason of a discrete 2.4 GHz RFID reader following major short-comings of the initial development chip-set
• 6 months Pi research, resolving poor spurious performance of their 3 /4.5GHz motorcar data/speech link
• 6 months Pi research, synth redesign on 800MHz tyre pressure transmitter, to improve microphony performance
• 1 month Simoco propagation dept, quantifying Tetra base station transmit intermod issues.
• 3 months Simoco propagation dept, quantifying Tetra receive interference and multipath propagation problems/issues
• Occasional Simoco visits to resolve issues on the PRF10 FM Base station. Also provide talks for the training school on this product
• I design/manufacture and supply medium wave transmitters and antennas for low power Hospital/Student radio systems.
• Rebanded the PRF10 Tx for 300MHz for MOD customer SERCO. Then had to redesigned synth loop, and add mod symmetry cct!
• Design of assorted 860 MHz RF amps up to 30W and masthead pre-amps for same
• Hardware design/software liason of RDS encoder
• Additionally, I have produced low noise front ends for Radio Astronomy, including front-ends at 408/1420MHz for the 18m ‘one mile array’ dishes at the Mullard observatory, and low cost 11GHz interferometry schemes using modified satellite tv LNBs and dishes. I monitor propagation at 10 GHz, producing the equipment to do this, including PA's up to 4W. With a colleague, give talks/demonstrations on things such as radio astronomy/seti/tesla coils. Designed and built the Cambridge 10 GHz beacon.
  
I have an extensive range of Test equipment, and also share pcb production equipment, and via Easy-PC can produce immediate development boards on material from FR4 to RF-35/RO 4003 microwave dielectric.

Simoco Europe Ltd (formerly Philips/Pye Telecom) unless otherwise stated (1979 /1999)

• TETRA Base station Tx (1999). Produced design study for high efficiency linear transmitter power amplifier

• MAP VHF/UHF mobile transceiver (1997-1998) Designed the transmitter power amplifier, antenna filter and PIN diode antenna switching circuit for all bands 68-512MHz. of this SRP8000 portable derived product. Controlled the internal mechanical layout and was responsible for the overall pcb layout of all RF areas.

• PRF10 series VHF/UHF FM Base Station (1992-1999) One of 4 person electrical design team. Also laid down and controlled the mechanical concept. Product uses boards from an existing high volume mobile design. Was responsible for the design of the unique RF boards required for duplex operation (Tx VCO, isolator, Rx antenna filter) plus the SMPSU regulator and overall PSU concept. Duplexers are bought-in items, so responsible for their use, but not design. From 1995/1999 continued to look after and develop the product onward on my own. This period covers the design of:
• 50W power amp variant.
• PIN diode control of integrated duplexer/simplex variant (for MOD)
• Band II wideband FM broadcast audio quality transmitter only variant for 25W RSL use
• Various band wideband FM broadcast/talkback link variants for commercial radio outside broadcast use
• Quasi-sync variant (ie design of Hi stability PLL board and general purpose interface framework)
• Trunking protocol community repeater variant (but using existing trunking control boards)
• Various minor options boards (DTMF controlled RFW, Rx call tone, RSSI conversion, telephone controller interface)

• FX5000 and FR5000 VHF/UHF FM Base stations (1988-1992) Designed the Tx power amplifier modules and UHF synthesisereceiver module. Designed the isolator ancillary.
• MX295 Band III mobile (1987-1988) Rebanded the transmitter power amplifier to 225MHz.
• F490 series VHF/UHF AM and FM series Base Station (1984-1988) Included the design of a VHF 25W AM Tx PA pcb.
• SSB200 100W HF ssb transceiver (1979-1984) Designed the Tx PA, and the switched antenna filters. Produced a teleradio unit

  Racal Telecom Ltd (1975-1979)

  Development of valve 500W HF power amplifier, its solid state driver and 1kW ATU product

  Bolton Institute of Technology (1972 – 1975) Obtained BSc in electronics and communication engineering

• Please contact me if you would like more detail on any of the items above

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