Local radio really came of age with the development of the
Mk III equipment. Whereas the first 20 stations had a conventional studio
and cubicle (or Ops. Room) with Mk III came the concept of the three-in-line
studio suite.
There was a desk in each end area (Cubicles 1A and 1B) and a common Studio
1 between them which could be controlled from either cubicle. With two identical
self-op areas the "hot seat change-over", which hadn't been a problem
until stations began continuous broadcasting for most of the day and not closing
down to a network for short periods, was avoided. A fourth smaller area was
provided for meeting and greeting guests before going on air and answering
incoming phone calls. A variation of this in-line arrangement was the four-square
layout adopted at Radio Merseyside which, while improving sight contact between
the areas, proved rather costly to build.
A further improvement over Mk II was the addition of a separate Apparatus
Room which serviced all the technical areas and handled all the lines and
communications which hitherto had been found in the Ops Room of the earlier
stations..
The Mk III desk is fully stereo and was designed specifically for local radio
by its engineers. It was built by Equipment Department at Avenue House, Chiswick.
It was designed for ease of use and very quickly found favour with presenters.
To the left are two Gram channels, four Outside Source channels selecting
from a 24 way OS mult. of, initially, BT music and control lines (now mostly
ISDN sources) and telephones and an RBR channel with a 10 way selector. Each
OS channel has a switch to select either cue or clean feed to its source together
with CL telephone answering and ringing provision (now little used). Above
the gram faders is the intercom LS and radio car talk-back control.
The centre section has the presenter's mic fader and two cubicle guest mics
for self op and two mics in Studio 1 next door. Above is the central comprehensive
metering, station intercom and Direct to Transmitter selector buttons.
To the right are the dual switchable input repro channels for tape and carts
whose second input has over the years been used for sources such as cassette
tapes, DAT recorders and Mini Discs. Most recently the primary inputs have
been used for the Radio Man computer playout system now almost universally
installed in the BBC's 39 local radio stations. In fact the ease with which
the desk has accommodated the digital revolution from which we all suffer
is testament to the versatility which was designed into it a quarter of a
century ago. The only modification with the arrival of Radio Man was to raise
the whole carcass by 40mm to allow the VDU screens to conform to current HSE
legislation!
Above the repro faders are the audio monitoring controls, compressor/limiter
switches, cue send selectors and five recording selectors for tape, cassette
or cart with their associated remote record start and indication, now largely
redundant since the advent of Radio Man.
All the units were part of Equipment Department's coded equipment scheme and
were thus immune from modification by the local engineers to enable interchangeablity
for maintenance. For this reason a separate panel was specifically provided
where local mods could be added to meet an individual station's requirements.
Usually a second conventional studio/ cubicle configuration (Studio 2) was
also provided elsewhere in the station. At Radio Leeds which had a very large
Studio 2 capable of seating about 150 people (the building was formerly a
church) a Mk IIIA was built which had 12 additional microphone channels which
could be activated by pushing an 'Overdrive' switch which took the installation
from a standard desk to a multi-mic mixer. This enabled large audience participation
and music sessions to be broadcast.
Among the innovations were Hytips which were used to connect the desk to the
outside world instead of soldered tag blocks. Initially a single equipment
bay was provided in each cubicle with PSUs , amps and a jackfield as in this
1979 picture of Cub 1B at Radio Leeds. At later stations the bay was dispensed
with as it was found that all the bay equipment could be tucked into the carcass
as in this 1981 picture, below, taken at Leicester.
In the late 70s a massive expansion of local radio was planned and Equipment
Department found itself unable to cope with producing many desks in a short
time. The Mk III design was given to an outside manufacturer who made desks
for a few stations. Unfortunately the power supplies had a tendency to burst
into flames and so they had to go. ED did manage to
manufacture some more Mk IIIs and one was finally withdrawn from service
at Lincoln in February, 2017 when the station converted to the new VILOR
format. Radio Lancashire was the last to lose its Mk III in 2018 ending
an era which started at Radio Cumbria and gave sterling and reliable
service for almost 45 years.
The final picture shows a preserved Mk III owned by Piers Bishop and still in
daily use.