Radar, AA, No4 Mk7 ready for action
Radar, AA, No4 Mk7 ready for transit
Purpose
Mobile equipment, providing early warning and target acquisition data to a FC radar. Facilities for operating with Equipment, Acquisition, Radar Target, AA, Remote, Mk1 are provided.
History
Description
Mobile S-Band transmitter and receiver in a trailer, 10-ton, 8-wheeled, radar, AA, No4 Mk7.
Presentation Unit
Plan position indicator (PPI) of targets on 9" CRT to optional ranges of 40,000yds,
80,000yds and 120,000yds.
'A' type scan on a CRT for monitoring.
Adjacent display (AD) plan position indication of targets on a remote consol.
Antenna System
Continuously rotating at 15 rpm consisting of a Durestos cheese and reflector.
The reflector is manually adjusted for minimum ground clutter. The operator can alter the
tilt angle, for height finding, during operation by means of a hydraulic drive system.
Pressurized waveguide feed with common T.R system.
Orientation by means of a sighted
tube mounted on the reflector.
| Weight | 15 tons 19 cwt |
| Height | operational 15' |
| travelling 12'9" | |
| Length | operational 24'7" |
| travelling 29'10" | |
| Width | operational 18'0" |
| travelling 9'6" | |
| Wheelbase | 14'0" |
| Turning circle | 42'0" |
| Ground clearance | 9" |
| Wading depth | 5' still water |
| 5' + 1'6" wave | |
| Bridge class | 16 |
| Braking system | Air brakes with mechanical handbrake |
| Towing vehicle | 10-ton 6x6 FV1100 series |
| Operational wavelength | S-Band |
| I.F. freq | 13.5Mc/s |
| Receiver bandwidth | 1Mc/s at -3dB |
| Tx power output | 1MW |
| Tx pulse width | 1.25 us |
| Recurrence freq | 700 to 800 c/s |
| Detection accuracy | range +/- 500yds |
| azimuth +/- 1.75deg | |
| Detection range | 120,000yds |
| Target discrimination range | 500yds on 40,000yd sweep |
| Target discrimination azimuth | 5deg |
| Data Transmission Range & azimuth | by synchro |
| Data Transmission Elevation | by telephone |
Power Supplies
415/240V ac 50c/s, three phase.
Consumption : 25 kVA
Normally supplied by a skid mounted Meadows diesel 27.5 kVA generator. Can be mounted
in the towing vehicle or in a separate vehicle.
Meadows 27.5 kVA generator
Operators
Radar : 2
I.F.F.
Provision is made for the fitting of IFF when provided.
Special Features
The cabin is fitted with an air-conditioning plant consisting of heating and cooling
systems, which enables the equipment to be operated under all climatic conditions.
A water cooling system is fitted to the magnetron.
Versions
No4 Mk7/1
As for radar No4 Mk7 but modified and fitted with IFF Mk10.
No4 Mk7/2
As for radar No4 Mk7/1 but modified for use with SAGW equipment
References and Sources
- EMER, Telecommunications, 0 240, Equipment Radar, AA,No4 Mk7, Mk7/1 and Mk7/2, Data Summary, Mar 1960,
- Equipment, Radar, AA, No4 Mk7, User Handbook, 1954,
- R.E.M.E. Museum Archives, Arborfield.
More No4 Mk7 pictures
Presentation Unit
PPI & monitor crt
Antenna system
Cabin layout