THE KG SERIES W/T CONTROL UNITS

It may come as a surprise to you but in 1948, as the cold war was hotting-up, and the infamous Russian KGB were taking over where the Gestapo had left off, the Royal Navy had a KGB all of its own and it too was to do with secrecy.

The series KGA to KGG were fitted in ships in conjunction with other Control Outfits.  In ships operating or controlling aircraft it was fitted in the ADR of a ship [Air Directing Room] in conjunction with the KFA-B and KFD-E Air Control system {which we have already covered as part of the KC Series}  usually in the FDO [Fighter Direction Officer] position, which gave him a facility for scrambling any voice line in the ADR.  In other ships it was used by operators through the normal Control Outfit.

Each different outfit in the KGA to KGG series had a different route to the user[s] or a different configuration, even unique to a ship or type of ship.  For example, only the battleship HMS Vanguard had the outfits  KGB and KGC, the former providing two lines of speech privacy in conjunction with the ships TBS/UHF Control System which was outfit KCT.  Any operators position in the BRR [Bridge Receiving Room - sometimes called the BWO] could use the scrambling system which was mounted in a 19" rack standing in the lobby of the BRR. The latter provided one line via the KFD Control System and was available on the bridge and in the FDO' Ops Room position. Outfit KGA was fitted in small ships to provide one privacy line.  The following pictures show you patching, routeing, user positions and equipment:-

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This file KGB FULL SCHEMATIC BLOCK.pdf  shows the full wiring/block diagram of HMS Vanguard's KGB system.  Note the rack to the right [bottom of file picture] called "H/F, V/HF RACK BAY 3" with drawers 'F', 'D', 'A', 'B', 'C' and 'E'.  This houses the receivers for the system, and drawers 'A', 'B' and 'E' are associated with the receiver P104 {Naval title CDU}, the receiver used with the VHF transmitter Type 87 - 100 to 150 Mc/s.  Note also that in drawer 'C' there is a B28 receiver {Naval title CDC}.  The audio outputs from these two receivers are hard-wired to drawer 'D' which is a PJF [Plug Jack Field}.  The labels on this drawer of sockets say:-

a. Lines 5 & 6 - CDU/P104 - Phone Out & CCR
b. Lines 8 & 9 - TBS in UTR {Upper Transmitting Room} - Phone Out & LRR {Lower Receiving Room} CCX
c. Lines 10 to 13 - KGB
d. Lines 15 & 16 - CDC/B28 - Line Out & CCX
e. Line 20 - CDC/B28 L/S/O/P {Loudspeaker Output}

The sockets, connected as required by double ended plug cables, are hard-wired to drawer 'F' which routes the selected receiver to the KGB Rack on the left of the picture [top of file picture].  Drawer 'F' on this KGB Rack controls all the Transmitters and Receivers used with this system.