On the left is the Engineering Managers desk, it has the 15 line manual telephone exchange. The outgoing sound lines and good talkback facilities.
On the right is the Sound desk. It has 20 channels divided into 3 groups, provision is made for PA outputs and extensive monitoring. There is no provision for equalisation, it is a flat response mixer. In case of power failure the whole sound chain of the MCR reverted to battery operation. The Engineering Managers desk had the manual telephone exchange and good talkback facilities.
This picture was taken during construction at Pye's factory
MCR21's Monitor Stack
Just seven monitors were deemed to be sufficient, one for each camera, two for engineering and production previews and in the centre the 17 inch transmission monitor. Associated with each 14 inch monitor is a BBC designed waveform monitor.
Top centre is an Optical PPM, also a BBC design. The idea being that the sound super visor can see the PPM in the same eye line as the transmission monitor. To either side are the clock and the dual standard off air check receiver.
This receiver with 405 line VHF and 625 line UHF was installed in advance ready for the start of the 625 line the following year.
MCR21 had 4 Pye Mk6 cameras and these are the Operational Control Panels (OCP) for them. Two desks are provided each with a bench seat, seating two engineers each.
From left to right:- Vision supervisors control panel and two OCPs for cameras 1 & 2. The Tektronix 515 oscilloscope in the middle. On the right, OCPs for cameras 3 & 4, at the end is a blank panel for a future caption scanner OCP. Each Camera has a dedicated picture monitor and waveform monitor.
This is one of series of pictures taken by Pye to promote their ability to produce a complex, yet flexible outside broadcast van to a detailed BBC specification.
Pye made ten of these, they were known by Pye as “Main Fleet Scanners”. Finishing with MCR28 they were the last of the line of BBC monochrome OB Vans.
They were significantly more advanced than earlier OB vans. Many new innovations were used for the first time, laying the ground work for the colour installations that were to come in just a few years time.
I was there – it was known as “Operation Vague One” and involved the RAF participation in the repatriation of the body of the Duke of Windsor to England. I think that the actual date of the live event was 31/5/1972. https://youtu.be/Eurv2p8TvdQI have no idea whether the pictures in the YouTube link are those from Lo21. The Duke of Windsor was formerly Edward VIII, King of the UK and Emperor of India from 20th Jan 1936 until his abdication on 11th Dec of the same year. He died on 28th May 1972 in Paris, so the 29th would fit in with a rapid deployment of Lo21 to RAF Benson.