||J and JB Types
||10 cwt Area Radio Investigation Vehicle,
type 1 (Morris)
||Radio Investigation duties
|Fleet Number Ranges
17110 (2 PGO) 1954
U82516 to U82560 (YXF 1 - 45) 1960 (JB)
|Date of picture
This style of vehicle was the Morris Commercial J or JB Type. The
J Type was produced between 1949 to 1957 and the JB between 1957 and 1961.
The J Type is fitted with a 1476 cc four-cylinder side-valve engine, whilst
the JB Type had an overhead valve 1489 cc, BMC B-Series engine.
The Morris J type 10cwt planning van
(SXH 237) was converted for Radio Investigation Duties.
The photographs below were taken at Wembley Exhibition Ground.
These GPO vehicles were fitted with front and rear wings made of
Because of this the headlamps and sidelights are fixed to the side panel.
General description and facilities
This vehicle has been rendered obsolescent by the adoption of a new two
tier method of operation for area radio investigation work (see RADIO,
Interference, A 1016). Its use is now confined to investigation units
requiring only limited facilities for operating equipment inside the
vehicle, though it does provide fuller facilities than would generally be
required for these duties.
The vehicle is a modified 10-cwt. forward control van equipped with windows,
security screen, aerial mast mounting tube, equipment lockers and a
longitudinal bench seat in the body. Facilities allow for some D.F.
work and the carriage of a small extension ladder.
Taken from - TOOLS & TRANSPORT, ENGINEERING INSTRUCTIONS,
VEHICLES, N 3040 (Issue 1, 24.11.66)
P.O. ENGINEERING DEPT.
TOOLS & TRANSPORT
Issue 1, 17.8.64
The 10-cwt. Area Radio Investigation Vehicle, Type 1 (Morris)
This Instruction describes the l0-cwt. Area Radio Investigation Vehicle, Type 1 (Morris) and the facilities which it provides. The vehicle is designed for use on Area radio investigation duties where the Minor Van, modified for radio investigation work, is inadequate.
A general view of the vehicle is shown above. It is a forward-control type with a body shell of welded pressed-sheet-metal construction, having windows along each side. Overall dimensions are: length 12 ft. 9 in., width 5 ft. 8 in. and height 6ft. 9in.
3. Security screen
The cab and body portions are separated by a metal-mesh screen to enable the body to be locked (see par. 9) without restricting access to the cab. This screen incorporates a folding type of access door to give personnel access between cab and body. Provision of hinged traps in the bottom of the screen permits the carriage of a ladder (par. 10). Additionally, the top sections of the screen are removable to give access to the sliding-door pockets (par. 18) for vehicle maintenance purposes.
4. Seating arrangements
In the cab section there is a single passenger seat in addition to that for the driver. Both these seats are adjustable. A further two passengers can be accommodated on a bench seat on the near-side of the body section although this seat is provided for the use of a man operating equipment within the body. The bench seat can be folded back and secured against the side of the vehicle, to give access to under seat lockers (par. 8) and to improve access to equipment carried within the body.
5. Writing facilities
A small writing flap is mounted above the engine cover directly in front of the forward passenger seat. The flap has a sliding support which should always be pulled out when the flap is extended, to avoid straining the hinges. To gain access to the engine the
complete table unit can be raised and secured by a strap type of fastener. If necessary the complete unit may be removed by loosening two wing nuts which secure it just below
the near-side windscreen.
An apparatus locker (see right) with three compartments is mounted along the off-side of the body section above the ladder space (par. 10). Access to this locker is obtained via three sliding panels in the top. The two rearmost compartments are lined with shock-absorbent material for the protection of test equipment and can be combined into a single large compartment by withdrawing the removable intervening vertical partition. The remaining compartment is fitted out with two removable trays (displayed
on the right) each of which is sub-divided by removable partitions to give adjustable storage for small suppressor components. Space is available below the trays for a tool bag, tool wallets or larger suppressor items.
7. A feature of the sliding panels (one upper and two lower) forming the top of the main locker is that they can be utilized to mount and set out equipment for making tests from within the vehicle, provision being made to secure such equipment in transit by using expanding rubber luggage straps. To make the whole arrangement as flexible as possible, the upper sliding panel may be fixed in one of three alternative positions and each lower panel in one of two positions, using flat slide bolts recessed into the upper faces of the panels. Additionally, the two lower panels can be completely removed via a gap in the sliding channel, to facilitate the removal of the vertical partition separating the two rearmost compartments.
8. There is an under seat locker on the near-side of the body. Access to this locker is obtained by lifting up the near-side bench seat which forms the locker lid. A further small locker under the forward passenger seat accommodates all the vehicle tools except the two long sections of the lifting jack handle which are secured in spring clips on the off-side sliding door pocket.
9. Locking arrangements
The near-side cab door and the rear doors are equipped with standard FA 600 or FP 750 series locks to enable the contents to be safeguarded when the vehicle is left unattended for short periods (the off-side cab door is fitted with an inside turn-button). For extended absences additional security can be obtained by padlocking the rear doors and the access door between cab and body. A hasp and staple are fitted to the rear doors and the interior door bolt is suitably modified for this purpose. Additionally, the bolts securing traps or removable panels in the security screen are located on the body side. Under seat lockers are equipped with hasp and staple so that they can be padlocked.
Padlocks l.25 in.... are the correct padlocks for use on this class of vehicle. It is advisable to keep all padlocks on the vehicle to one suite.
[NOTE:- Padlocks 1.25 in.... are sometimes of the spring self-locking type. To prevent the accidental locking of keys inside the van body, it is recommended that the padlock keys should not all be carried together.]
10. Ladder carrying facilities
A Ladder, Extension, No. 4A or No. 5 can be carried on the floor in the space below the off-side apparatus locker. The head of the ladder projects through a trap in the bottom of the security screen, into a recess formed below the driver's seat.
A rotatable aerial-mast housing with coaxial connector box is located towards the rear of the body (Fig. 2). This device is controlled remotely by a handle positioned to the rear of the driver's seat and can be rotated through 400
degrees, care being necessary to ensure that the coaxial cable connecting the connector box and test equipment is long enough to permit this travel. Elongated mounting slots for
the remote control handle allow for the adjustment of the remote control wires.
12. Each aerial array (made up locally as required) to be used with the rotatable mast housing requires to be mounted on a 1 in. outside diameter tubular support mast, having two
0.25 in. slots cut diametrically opposite in the bottom end. When the mast is slid into the top of the mast housing, it is turned until these slots locate on to corresponding studs inside the housing above the connector box. The studs have projections outside the housing to form a pointer so that, if the aerial array is lined up with the slots in its support mast, the orientation of the aerial can be followed by an operator inside the vehicle. Connexions to the aerial array are made via a coaxial lead threaded through the support mast and having a short tail with coaxial plug to terminate on a coaxial socket inside the connector box.
13. A business radio aerial (Aerial-units Nos. 17/1 and 17/2) may be fitted centrally on the roof if required. The Workshop
Supervisor/Mechanic-in-Charge will fit the aerial base on receipt of a formal request from the Assistant. Engineer concerned.
WARNING:- The driver must be extremely careful of low overhead clearances when an aerial array is in position above the roof
14. Power supply for test apparatus
A 5 amp point, mounted above the off-side body window, is wired to the vehicle battery via low resistance leads and is intended for use with test apparatus. Additional power capacity can be obtained by the use of separate 6V car type batteries which should be stowed in a convenient position, using the rubber battery trays supplied with the vehicle. Fig. 2 shows the extra batteries stowed below the operator's seat.
15. Use of apparatus within the vehicle
While the uses of radio test equipment to be used inside the vehicle are described in the various instructions appertaining to Radio Investigation duties, there are a number of specific precautions to be observed in relation to its use on vehicles.
(a) Do not drive while wearing earphones
(b) Do not drive holding a microphone or handset
(c) Ensure that legal requirements for the operation of a television set in a vehicle are scrupulously observed. These are:-
No part of the television screen shall be directly or indirectly visible to the driver while he is in the driving seat.
None of the television set controls, other than the main switch and sound volume control, shall be within the driver's reach while he is in the driving seat.
A television set must not be used in circumstances and in a position such that it might
cause distraction to the driver of any other vehicle on the road.
16. Maximum load
The maximum load to be carried by this vehicle is 10 cwt. excluding the driver. In cases of doubt a simple check can be made by weighing the vehicle in its moving condition, i.e. complete with contents, personnel, full petrol tank, etc. This gross moving weight must not exceed 40 cwt. Any weighbridge charges involved should be passed to Freight and Cartage.
17. Sliding doors
Under normal driving conditions the cab sliding doors should be kept shut while the vehicle is in motion, as a precaution against accidents. In foggy weather or when
manoeuvring in a congested space it may nevertheless be found an advantage to have the doors open. In such circumstances the doors should be secured in the open position by the turn catches near the bottom of each door.
18. Sliding door pockets
The glazed door pocket panels hinge upwards when the securing screws along the bottom edges are freed, to give access for cleaning purposes.
19. First aid kits
The driver's first-aid kit is located above the windscreen. If the personnel regularly using the vehicle are equipped with a larger first-aid kit, this should he mounted in a prominent and accessible position using two leather straps. Two suitable leather straps complete with buckles should be purchased locally where necessary.
20. Windows, lighting and heating
Natural light is provided by the windows in the body and rear doors, the two rear-side windows having sliding
panels for ventilation. For night work an internal light is mounted in the body above the near-side windows with the control switch above the off-side door pocket. This general lighting can be augmented by a bench lamp if desired.
Blinds are provided on the body windows and rear doors. These facilitate the use of a television set within the body and combat difficulties of dazzle from other road users using headlights at night.
22. A cab heater/windscreen demister of the re-circulation type is fitted.
23. Vehicle battery
The vehicle battery is housed beneath the vehicle floor and access is obtained via a floor trap situated immediately behind the driver's seat. A budget lock secures the floor trap.
24. Spare wheel
This is housed at the rear below the floor and, to remove it, the hinged rear number plate should be slid towards the near-side to release a spring-loaded catch, and then raised out of the way.
25. Damage to paintwork
The outside of the van has a synthetic enamel finish. Attempts to re-touch any scratched or damaged parts should not be made by the staff using the vehicle. Work of this nature will be undertaken by the Workshop Supervisor/ Mechanic-in-Charge when necessary and during periodic overhauls.
Standard inscriptions for signwriting are given in C 0015.
27. Speed limit
See D 0022
An extract from
THE POST OFFICE ELECTRICAL ENGINEERS' JOURNAL
Volume 53, Part 1, April 1960
A Vehicle for Radio Investigation Work
A description is given of a new vehicle for use on radio
investigation duties. The vehicle is based on an existing standard type, the
Area Planning and General Purpose Vehicle.
The first type of vehicle specially developed for radio investigation (R.I.)
work and capable of transporting two men with their equipment was introduced in
1935. It was an adaptation of a postal van and was known as the 8 cwt R.I.
Vehicle. It had a non-metallic body - a feature then thought essential - and
could mount an external aerial. This type of van remained the standard vehicle
for radio interference work until 1947 when the Morris R.I. Car (Fig. 1) came
into service. This vehicle, like its predecessor, had a non-metallic body and
was based on a Morris 8 cwt chassis. One hundred and sixty-five of these R.I.
Cars were provided and they proved to be a marked improvement on the previous
type. In addition, modified Minor Vans were introduced to meet the greatly
increased need for vehicles for the radio investigation service.
Experience with these vehicles under a wide range of conditions, however,
naturally revealed scope for further improvements. In particular, the roof
sockets for aerials were difficult to keep weather-tight, and the need for
less-cramped operating conditions and better stowage arrangements for the
apparatus became apparent. The security of the apparatus itself also presented
problems. Since a non-metallic body was no longer considered essential, it was
possible to base the design of a new vehicle on an existing standard type - the
Area Planning and General Purpose Vehicle - which seemed likely to provide the
THE NEW VEHICLE
The general appearance of the new vehicle is shown above. The large side-windows
and glazed pockets for the sliding side-doors help to give a good all-round view
from the operator’s position, so enabling him to pass instructions to the driver
when they are “homing” on a source of interference.
In addition to the usual seats for the driver and passenger, a bench seat is
provided on the near side as an operating position. The space beneath this seat
provides convenient stowage for batteries, for which rubber trays are provided,
and a cabinet on the offside provides a table on which apparatus may be mounted.
The table is lit by a lamp fitted over the near-side door pocket. A 5-amp
socket-outlet over the table is connected to the vehicle battery.
A folding table is fitted in front of the passenger seat to provide additional
A combined heater and demister is provided, and blinds are fitted to the side
windows for use as required when operating within the vehicle.
Stowage and Security of Apparatus
To provide security for the apparatus carried in the vehicle an expanded-metal
screen is used to divide the cab from the rest of the interior of the body.
Since it is necessary to provide access from the cab to the rest of the
interior, the screen is arranged in the form of two fixed panels, one on each
side, and a folding door hinged to the near-side panel. When open, this door
folds flat against the fixed near-side panel. The side panels themselves are
formed from two smaller panels, the upper parts being detachable to give access
to the glazed door-pockets for cleaning purposes. Hinged flaps are provided at
the bottom of the off-side fixed portion and at the bottom of the folding door
to permit a ladder to be carried.
Both the screen and the rear doors can be padlocked, while the opening
side-windows are, of course, secured on the inside by window catches.
The full security provided enables the stowage facilities for the radio
apparatus to be combined with the bench space required to mount the apparatus
when it is in use. No separate locked accommodation is therefore required. The
apparatus storage takes the form of a cabinet divided into compartments. Access
to the compartments is obtained via sliding panels which form the top of the
cabinet and provide the bench space. Apparatus mounted on the panels may be
secured in position with elastic luggage-cords anchored to flush-fitting anchor
pins inserted in the panels. By leaving one panel free it is possible to gain
access to any of the
compartments by sliding the panels as required without it being necessary to
disturb any apparatus set up for use on the bench space. Flush-mounted bolts
enable the panels to be locked in position to prevent any uncontrolled movement
when the vehicle is in motion.
To avoid the difficulties experienced with aerial sockets on previous vehicles,
the aerial support on the new vehicle transmits no stress from the aerial to the
vehicle roof and at the same time provides a weathertight mounting. The mounting
consists of a tubular support extending from a batten on the vehicle floor to
the roof and terminating at each end in a socket. This tubular support provides
a direct channel for water entering at the roof end to a hole in the floor
beneath the lower socket. The sockets are so arranged that the support can be
rotated either directly by hand or by remote control from the cab. The
remote-control gear, which enables the aerial to be rotated through 400° if
required, is operated by a handle fitted behind the driver’s seat; this handle
is connected to the tubular support by flexible steel wires encased in steel
conduit. The conduit and the control gear are fixed to a detachable batten to
facilitate vehicle maintenance.
A junction box with a hinged flap carrying a coaxial connector is fitted to the
tubular support to enable the coaxial lead from the aerial to be connected to
the apparatus. The hinged flap of the junction box is fitted with a gasket to
provide a watertight joint when the flap is closed.
To mount an aerial it is only necessary to insert the stub end into the open end
of the tubular support on the vehicle roof. The stubs of the various types of
aerial are slotted to engage with a pin fitted to the tubular support just below
the underside of the roof. This pin projects outside the tubular support and
provides an indication of the direction to which the aerial has been rotated.
The aerial support is fitted at the rear of the vehicle to enable the operator
to mount the aerials while standing on the vehicle floor.