C13 Larkspur Radio Aerial Tuning Unit No.11 5820-99-949-0507

This is an incredibly rare C13 Larkspur Radio Aerial Tuning Unit No.11 5820-99-949-0507, dating to the 1960s.

Dark green in colour and in good condition with surface scuffs and scratches commensurate with age and use: it has not been tested. 

(NB: The images were taken with and without flash hence the colour differences. The ATU is dark British Army green in colour).

Metal label on the left hand side is marked:-

Tuner Radio Frequency No.11 ↑

5820-99-949-0507

BCN XM 8225

Approximate Size:

• Max. Depth: 29cm
• Height: 15cm
• Diameter: 12.5cm 
• Unpacked Weight: 4 kg 

The Aerial Tuning Unit No.11 would have been used in conjunction with a C13 Station radio, (not included), which was used as a ground station or in vehicles superseding the C12 and WS19 on which it is based. The tuner matched the 70Ω set output to rod/aerial wires located adjacent to the C13 set or, remotely, if connected via a 70Ω coaxial feeder with an antenna adapter box. 

NB: See appended image of a C13 radio set with a red arrow indicating the position of the ATU No. 11.

For more information see L. Meulstee Wireless for the Warrier Compendium 2, pages 343/4.

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