Maximus R&D
About Pieter Hooijmans
About Maximus-R&D
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Technology History
Piet Hooijmans 1918 - 2006
Piet's Home-built Television pt1
EQ40 and EQ80
TV Tuner history pt1
History as always been one of my main interests, covering the entire period from pre-history to modern times. As long it is covering an interesting period and well written - and with maps and good illustrations! - I read everything. As an engineer technology history has a special place, especially when it has links with my own interests or activities. So here you will find a few results of my digging up stories. I started with those where my father and his 1947 home-built TV were involved, but gradually grew into the history of early Phikips TVs and finally the history of the Philips TV tuner.
Piet Hooijmans 1918-2006
The career of my father in engineering and the surprising technologies he worked on. This is also the trigger for the more detailed stories on early television development, including my father's home-built television from 1947, as well as the EQ40/80 and tuner history.
Piet's Home-built Television, or how Philips developed television, part 1 1946-1949
Triggered by the 1948 home-built television of my father, I've tried to reconstruct the early developments that lead to the first television sets. It covers activities of Philips Research, the Radiobuizen Lab and the Apparaten Lab. Includes the story of the Philips 567-line standard development and the PET experimental transmissions from Eindhoven.
The 2nd part of the story, starting with the new 625-line TV standard and covering the first five generations of TV sets, as well as the build-up of the valve, picture tube and television factories. Includes analysis of the innovation steps in each successive set, the struggle with the many different standards across Europe and the story on the Protelgram back-projection TV's.
The EQ40/EQ80 enneode
The development, principles and applications of this unique 9-electrode valve on which my father worked as a young engineer and that was also used in his home-built TV receiver. Includes the overview of all known applications of the EQ40 and EQ80, in FM radio, television and professional applications.
Philips tuner history pt1: valve-based VHF tuners
Detailed description of the evolution of the television channel selector, or tuner, from the first 1947 post-war televisions to the mass-produced 12-channel drum tuners towards the end of the 1950s. Contains overviews of circuit evolution, the types produced, their application linked to the simultaneously evolving TV standards, as well as sections on tuner RF reception theory.
Philips tuner history pt2: introduction of UHF
UHF tuners, covering the 470-860MHz band, were a real challenge around 1960, requiring mass-producible modules operating at unprecedentedly high frequencies. In parallel the VHF tuners continued to evolve, driven by the new frame grid valves. And major effort was put into more user friendly channel selection and tuning mechanisms, including such advanced solutions as motor controlled tuning.
Philips tuner history pt3: transistors, varicaps and a bit of colour
In 1963 the first transistorized UHF tuners appear, followed a year later by the VHF transistor tuner. All based on germanium transistors, that would remain the dominant component until replaced by the silicon transistor in the mid 1970s. In the meantime another important key component was introduced: the variable capacitor or varicap, allowing electronic tuning. This in turn supported much innovation in the way channel selection was performed, introducing pre-set channels, touch buttons and finally digital control. All this in parallel with the emergence of colour TV.
Philips tuner history pt4: IC-tuners, frontends and modulators
With the UV400 family the first integrated circuits (ICs) were introduced inside the tuner: pre-scalers. Over 20 years this would extend to the mixer-oscillator, PLL and MOPLL. In parallel the tin can Front End came up for high end sets: tuner and IF in a single module. Other RF modules in consumer electronics were the video recorder modulator and the satellite front end. All this against the background of many take-overs, aggressive Japanese competition and a Philips management that was rapidly loosing its strategic focus.
Philips tuner history pt5:
Tuners become a commodity, with enormous price erosion, further strengthened by the introduction of World Standard Pinning. Integration continues with the MOPLL, while digital television introduction creates both opportunities and uncertainties. Continuous cost cutting and reorganising sets in, bringing both the TV and the Tuner business in an unstoppable negative spiral. A Research and Semiconductors project makes the silicon tuner finally a reality, although that will not stop the decline.
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