LRDG Wireless set up

[Charlie Down]

Hi Ron,
So the No11 set would use 12 volts from two 6 Volt batteries in series to power the set. On the LRDG trucks this would be achieved by using the truck 6 volt battery connected to the battery on the side step in series through the Charging Switch Panel.
Would there be any possibilty/need for a third battery to boost the signal for long range transmissions? And would sending the signal flatten the batteries sufficiently to require a alternative source of electricity to start the truck? Would the truck engine be switched off during signalling to prevent interference?