Were developed in 1940 for the British army and covered the frequency range 1.2MHz. to 17.5MHz.
Both units could be used together, individually, or with other sets.
The army specified the transmitters range as 15 miles using RT or MCW. or 60 miles using CW.
The transmitter pictured was manufactured
before May 1941 and was used as the
photographic model for all the wartime WS12 manuals.
Over 2600 sets were manufactured
The transmitter was not working when I got it and some
modifications by a previous owner had to be removed.
was in May 1941.
replacing. A good modern copy was used and after this the remaining old wiring was neatened up.
The transmitter now works well on all frequencies but the power output is a bit low above 12MHz. This could be
faulty decoupling capacitors or the long interconnecting wires used in this set. Or maybe all 12 sets just give less
output at the higher frequencies.
The WS12 transmitter could be remote
controlled from more than a mile away
over a telephone cable and this is the
box that did it.
parts; valves were easily broken so
this tin kept the transmitter valves safe.
A similar box was used for the receiver valves.
Some R107 receiver like the one below
had a spare set of valves inside their case.
This receiver has a high serial number of over 18000
so was probably manufactured after 1943.
I have done nothing to this receiver apart from replacing
the missing
vibrator pack. All the capacitors and resistors
are original. The set works very well.
As well as its many other roles all this equipment was
designed to fit snugly into the back
of a 15 cwt
wireless truck.
This is the inside of my Morris commercial CS8
15 cwt
wireless truck, the new home for this radio equipment.
R107 Receiver and to the right will be the WS12 Sender.
This picture from 1941
shows an
early R107 (serial No 15)
and WS12 (serial No 10). The WS12 and R107 came
with a kit of all the items required to install them in a
Morris 15 cwt truck this included nuts, bolts,
aerial poles,
generator set, storage bins.
Even instructions for removing
the old
roof
aerial
number 2
and fitting the newer roof
aerial number 5.Total station weight
was 3/4 of a ton.
Not
including the truck.
Links VMARS host the following manuals and many more.
R107 Reception set Manual PDF 4.9Mb
WS12 Sender Manual PDF 8.5Mb
Wireless Set No 19 Group This site has 100s of
fantastic
manuals
but is a little painful to use.