Monument record 1169101001 - School Hill, Charndon

In October 1942 SOE's only transmitter station was at Charndon (known as Station 53a). The transmitting building was 20’ by 12’ (6.10m x 3.67m) and housed 18 250-watt transmitters. One 20-pair cable was installed between the receiver at Grendon Hall and Charndon for remote control. Stand–by power was available from a 9KVA generator (housed in a separate building). Expansion of this transmitter building occurred at a later date and a structure measuring 35’ by 18’ (10.67m x 5.48m) was erected. Within this, a further six 250-watt transmitters were installed. Four halfwave di-poles were erected and SOE arranged that any aerial could be connected to any transmitter. Each transmitter was equipped with two end-fed aerials, one for day frequencies and one for night frequencies (B7).