Station Video Mux: Difference between revisions
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Dummy User (talk | contribs) (Controller PIC been replaced) |
Dummy User (talk | contribs) (→32 x 4 replacement: I've just found the data on the tuners on distel's site still!) |
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An increase was made to 32 inputs and 4 outputs, along with controller box. | An increase was made to 32 inputs and 4 outputs, along with controller box. | ||
It included two NICAM stereo terrestrial tuners from [http://www.distel.co.uk/ Display Electronics] which could be retuned under computer control, this was key to the scheduling system and was also intended to make use of the recently upgraded AV network which was stereo capable. | It included two [http://www.distel.co.uk/data_my00.htm NICAM stereo terrestrial tuners] from [http://www.distel.co.uk/ Display Electronics] which could be retuned under computer control, this was key to the scheduling system and was also intended to make use of the recently upgraded AV network which was stereo capable. | ||
The new mux was briefly installed for a weekend for testing in {{unsure|2002}} and later withdrawn for minor hardware alterations - it was carried back to Cambridge by train, which included a brief section sliding round in the back of a coach as a derailment had meant trains had to skip part of the journey to Peterborough, making it the most travelled mux in history. | The new mux was briefly installed for a weekend for testing in {{unsure|2002}} and later withdrawn for minor hardware alterations - it was carried back to Cambridge by train, which included a brief section sliding round in the back of a coach as a derailment had meant trains had to skip part of the journey to Peterborough, making it the most travelled mux in history. | ||
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All the parts were sourced as free samples from [http://www.maxim-ic.com/ Maxim] under various psuedonyms since the MAX458 crosspoints were actually worth about £40 each. | All the parts were sourced as free samples from [http://www.maxim-ic.com/ Maxim] under various psuedonyms since the MAX458 crosspoints were actually worth about £40 each. | ||
To avoid the obsolescence problem that the Breaker 88 unit suffered, there are | To avoid the obsolescence problem that the Breaker 88 unit suffered, there are in fact two muxes. A spare circuit board and set of 4 chips are in storage in case of failure, and the controller is made using a cheap reprogrammable micro controller. Some 885 lines of assembler code are all that were required in the micro to perform all of its control functions. | ||
==Today== | ==Today== | ||