The 38 set utilised its own battery, presumably the standard set battery and as Chris said, was connected to the system using a CU No. 12.
I suspect the plan to fit them in a lot of tanks never quite came to fruition as you often see the extra aerial mounting bracket welded on with no aerial base fitted in wartime photos.
I have seen a drawing of the installation in a Churchill, can't remember where!
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Adrian Barrell
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