Appendix A: Equipment glossary (continued)




R-TRadio Transmitter 
RxAbbreviation for receiver 
ThorneycroftAnother large RAF transport vehicle complementing the Crossley 
TRETelecommunications Research Establishment   (The body responsible for Radar development for the RAF).NB Article
TxAbbreviation for transmitter 
Type 11Mobile sets as possible standbys, should the 1.5m CHL/GCI radars be jammed. 50cm wavelength, as used by Germany, reduced risk of jamming.NB Article
Type 13Height-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 277NB Article
NB Diary
Type 1410cm surveillance radar.  Similar electronics to type 13.NB Article
NB Diary
NH Article
Type 15Main 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 CrossleysNB Article
Type 15 GCI ConvoyConsisted 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 21Five vehicle GCI convoy comprising Types 13 and 14, control centre and two diesel generators.NB Article
Type 25The 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
ThunderboltUS Fighter BomberNB Diary

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