The following 'systems' are not finite. What is included is to demonstrate how various equipments were controlled.

  This Series (now in addition to CCS and CWS) was fitted in the late war years to enable British and American transmitters and receivers to be used remotely. However, it did not handle VHF transmitters and tended to differ widely in facilities offered between ships. Like all war fits, it was a necessary expedient and people accepted it, "warts and all". It continued using what the CWS had started, namely the CCX (Control Circuit Exchange), a plug and socket matrix, supported by an assortment of various control boxes at each and every remote user position. To avoid boring you, instead of mentioning each and every 'little box of tricks' we will show you, in the KH Series section which is on the next page, some photographs of these typical control boxes.

  The basic facilities enabled each remote position to:-

    A.  Switch on and off the transmitter.
    B.  To key the transmitter in W/T.
    C.  The Base Unit for the Control Unit.
    D.  To transmit R/T.
    E.  To receive.

  Outfit KDA was a system which was much envied by other Navies. It used existing technology namely that of the GPO Telephone Dialler to send signals down the line, control remote transmitters, or to speak, when necessary, to the operator manning the Transmitter Room (TR) who was called the "TRW", 'W' standing for Watchkeeper. This 'clever' piece of kit can been seen above in picture No3. Picture 17 also shows this unit which is called the W/T CONTROL UNIT. Picture No3 is marked with numerals 1 to 29 (with lapses) and here we explore the device with an explanation.

    A.  For W/T, a circuit exchange (CCX) system which enabled a remote position to:
          i.  Key the transmitter.
          ii.    Switch the transmitter on and off.
          iii.   To receive.
    B.  For R/T, each transmitter is wired to a socket unit to which a receiver can be connected. Each socket unit has 3 output sockets for connecting to remote circuits.

This Group covered KCH to KCP

and to cope with the "new fangled V/UHF kit" - the TBS - the Series was continued to KCQ - KCU as follows:-

  This series KCQ - KCU, provided facilities for switching on the motor generator providing transmitter HT with lamp indication that the generator was running correctly, and thereafter, control of the transmitter for R/T and the receiver.

  During WW2, aircraft came to the fore and were a major contributor in winning it for the Allies. Communications with fighter aircraft [in particular] in direct support of the Fleet was a pre-requisite, and radio communications between ships and the aircraft were paramount to the success of the air asset.

  This brought into being the KF Series {easy to remember K = Control (they couldn't use 'C' because it was already assigned for other communication purposes) and F = Flying and the series consisted on KFC-KFG as follows:-

	KFC		This was widely fitted ashore in Royal Naval Air Stations [RNAS] and was still going strong almost up to and including 1980.
	KFD, KFE		These were the very first R/T control systems fitted in ships for fighter direction. KFD allowed 6 channels with 3 controlling positions and was fitted into A.A. ships and above, except carriers and fighter direction ships. KFE, a much bigger affair, supplied 12 channels with 6 control positions and was the main fit in carriers and fighter direction ships. It was possible to increase this number of channels by a further 10 positions in the OPS ROOM.
	KFF, KFG		Were later updates for the KFD and KFE respectively above, and modernised the Fleet Air Arm working spaces by fitting them with their own CCX's.
	KFJ		Was fitted into carriers and was used as CCA. It enabled 4 controllers, each on a separate channel to converse with the pilot of an aircraft during his approach. This is what the block diagram of a KFJ system looked like: Click to enlarge.

  Towards the end of WW2, the Admiralty designed a brand new system which would give to any user in the ship notwithstanding, the ability to use any piece of W/T equipment at their place of duty. However, since the FAA were well served with KFF (non carriers) and KFG (carriers) a change to a new system had to take account of their well proven and established system. The Admiralty introduced the KH System, parts of which contained the now 'old' KFF and KFG systems.