Marconi B28 receiver at left on shelf. Maconi FH4 DF receiver; power supply for FH4 on shelf at right. At the very right of the photo is a flexible voice pipe.
The FH4 tuned 1 to 24 MHz and employed a CRT for direct visual bearing indication.
HF/DF Office. Forward bulkhead.
FH4 receiver at bottom, FH4 power supply on shelf. The four fat cables egressing from the deckhead are the coaxial cables for the forward/aft (F/A) and port/starboard (P/S) antenna loops. The large box with the eight cable connections is a junction box which interconnects the four coaxial cables from the FH4 to the loop antenna cables.