Radar, AA, No3 Mk1
Purpose
Mobile equipment for providing accurate and continuous measurements of range, bearing and angle for fire control of HAA artillery.
History
Description
Known as the APF part of the Canadian GLIII(C) System.
Four-wheeled trailer with steel and wooden rotatable cabin. Parabaloids and dipoles
mounted on steel frame-work, lowered for travelling.
I.F.F. MkIII (RC-148) for, and Presentation Unit (P.P.I.) of, radar AA No4 Mk1
mounted on and in cabin. The ZPI was the No4 Mk1.
Presentation Unit
PPI
| Length operational | 25' without IFF antenna |
| 28' with IFF antenna | |
| Height operational | 15'6" without IFF antenna |
| 20'2" with IFF antenna | |
| Height travelling | 10'7" |
| Weight | 10.5tons without IFF |
| 11tons with IFF |
| Operational wavelength | |
| I.F. freq | |
| Receiver bandwidth | |
| Tx power output | |
| Tx pulse width | |
| Recurrence freq | |
| Detection accuracy | |
| Detection range | |
| Data Transmission |
Antenna system
A pair of 4' parabaloid dishes, one for transmit the other for receive.
I.F.F.
RC-148 if fitted
Versions
The No3 Mk1 with the AA Command modification was to be known as the No3 Mk1*
The No3 Mk1 has been improved upon and is known as the No3 Mk6 (GLIII*C)
These improvements are ;
- A single 6' parabaloid in place of two 4' parabaloids of GLIIIC and waveguides instead of concentric feeders.
- Rotatable parabaloid assembly instead of rotating cabin.
- Increased power 3BX with rotary spark modulator and increased magnetic field from strong permanent magnet.
- Improved thyratron control aided laying tracking system.
- Removal of PPI to ZPI trailer.
- Additional IFF in APF for targets being tracked.
- Transmission of height by magslip.
This interim equipment is being built by NRO but it is unlikely that there will ever be any production
References and Sources
- R.E.M.E. Museum Archives, Arborfield.
- Clive Prothero-Brooks, RCA Museum, Shilo, Manitoba, CA
More No3 Mk1 pictures
Rear view of the Presentation Unit
No3 Mk1 radar in operating position.
No3 Mk1 residing at the Royal canadian Artillery Museum, Shilo, Canada.