Appendix A: Equipment references (b)




R-T*** Radio Transmitter
Rx*** Abbreviation   for receiver
Thorneycroft*** Another large RAF transport vehicle   complementing the Crossley
TRE Telecommunications Research Establishment   (The body responsible for Radar development for the RAF). NB Article
Tx*** Abbreviation   for transmitter
Type   11*** Mobile   sets as possible standby’s should the 1.5m CHL/GCI radars be jammed.  50cm wavelength, as used byGermany,   reduced risk of jamming. NB Article
Type 13* Height-find radar which only gave information about the height of a particular aircraft as required.10cm ‘Nodding’ height finder.  Tx and Rx of Naval type 277 NBArticle NB  Diary
Type   14*** 10cm   surveillance radar.  Similar   electronics to type 13. NBArticle   NB Diary     NH  Article
Type 15* Main GCI Radar from which the bomber and   intercepting fighter would be controlled from the ground.GCI radar.    Mobile version of Type 7.    Usually consisting of aerial transmitter, 2 diesel generators, crane,   R-T, jeep and 4 Crossleys NB Article
Type   15 GCI Convoy Consisted   of a number of vehicles.  The aerial   was used for both transmitting and receiving and the primary radar of the   convoy.  Two diesels were on separate   lorries to provide main and standby power on whatever remote site was   required.  These units were self   sufficient out in the field and a crane would have been needed for   repairs.  The RT was in the back of a   lorry and used for directing aircraft toward hostile bombers, which was the   role of these units.  The jeep would   have been used by officers for surveying future sites, reporting to HQ.  The Crossleys were used for transporting   men and equipment.
Type   21*** Five   vehicle GCI convoy comprising Types 13 and 14, control centre and two diesel   generators. NB Article
Type   25 The   designation given to equipment consisting of types 11, 13, 14 and 15, i.e.   the types of radar used by a mobile GCI convoy. NB Article
Thunderbolt US   Fighter Bomber NB Diary
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