Nomenclature not covered in other sections

A2 RATT A Ratt system based on AF two tone shift keying using a UHF system in the DSB mode.
A2J 1kHz tone keyed sub carrier is added to TX synthesised frequency to produce A1
A3A Voice in USB with a pilot carrier. Carrier re-insersion not required - ordinary DSB RX is used
A3H Voice in USB with a full carrier. Carrier re-insersion not required - ordinary DSB RX is used
A3J Voice in USB with suppressed carrier. Carrier re-insertion required at receiver.
ACI Adjacent channel interference
ADCCP Advanced data communications control procedure (ANSI)
ADCOCK A system of folded dipoles for the D/F outfits FV series
AE Aerial
AF Audio frequency
AFC Automatic frequency control
AGC Automatic gain control
AM Amplitude modulation
AMI Alternate mark inversion
AMRAD Automatic message routeing and distribution system
ANSI American national standards institution
ARPANET Advanced research projects agency network
ARQ Automatic request for repetition
ASCII American standard code for information interchange
ASSATS Advanced ship-shore automatic telegraphy system
ATU Aerial tuning unit
AVC Automatic volume control
BCA Broadcast control authority
BER Bit error rate
BERT Bit error rate testing
BFO Beat frequency oscillator
BSC Broadcast Control Station
BSC (BiSync) Binary synchronous communication (IBM)
BWO Bridge wireless office
CARB Channel availability and receipt broadcast
CCIR International radio consultative committee
CCITT International telegraph and telephone consultative committee
CCO Central Communications Office
CCR Communications control room
CCS Central Control System
CDMA Code division multiple access
CEPT European conference of postal and telecommunications
CFC Communications facility control
CODEC Coder-Decoder
COS Change over switch
CPU Central processor unit
CR Communications requirement
CR100 B28 receiver - Marconi commercial design
CR200 B29 receiver - Marconi commercial design
CRC Cyclic redundancy check
CRL Contingency rear link
CRP Character release pulse
CSF Classified socket field
CSMA/CD Carrier sense multiple access with collision detection
CSU Crytographic switching unit (Outfit PRC{1})
CUG Close user group
CW - A1 Continuous wave - Morse Code
CWS Centralised Wireless System
CYO Crypto office
DATEL UK PTT Data transmission service
DCE Data circuit - terminating equipment
DCN Defence communication network
DDCMP Digital data communications message protocol (DEC)
DDFS Direct digital frequency synthesis
DFTS Defence fixed telecommunication system
DNST Directorate of naval shore telecommunications
DPE Dual path emission
DPSK Differential phase shift keying
DRS Distributed resource system (ICL)
DSB - A3 Double side band voice
DTE Data terminal equipment
EAA-EAZ Common aerial working outfits
EBCDIC Extended binary coded decimal interchange code
EDAC/EDC Error detection and correction
EIRP Effective isotropic radiate power
ELTN Engineering liaison teleprinter network
EOW Engineering order wire
EVOS Electronic voice operated switch
EWO Electronic warfare office
FAB Frequency availability broadcast
FCO Fleet communications officer
FCS Frequency calling schedule (HF Radio) - Frame check sequence (Data comms)
FDM Frequency division multiplex
FDMA Frequency division mutiple access
FEK Frequency exchange keying
FEP Front end processor
FM Frequency modulation
Frequency band J 11900-14250 MHz - later 11500-18000
Frequency band K 20500-26500 MHz - later 18000-25000
Frequency band L 390-1650 MHz - later L2 300-1000 L1 1000-2000
Frequency band Q 33300-37500 MHz - later 25000-40000
Frequency band S 1650-5200 MHz - later 2500-4100
Frequency band V 50000-75000 MHz - later 50000-74000
Frequency band X 5200-11900 MHz - later - C 4100-7000 X 7000-11500
Frequency EHF Extremely high frequency 30 GHz - 300 GHz
Frequency HF High frequency 3 to 30 MHz - Short Wave -in the RN usually 1.5 to 24 MHz
Frequency IF (post war) Intermediate frequency of a superhet receiver between the RF and AF stages
Frequency IF (pre war) Intermediate frequency. In the 1930's this meant the 300-3000 kHz frequency band
Frequency LF Low frequency 30 to 300 kHz (In the 1930's this meant all below 100 kHz) - Long Wave
Frequency MF Medium frequency 300-3000 kHz - Medium Wave -RN usually 240 kHz to 3MHz
Frequency SHF Super high frequency 3GHz to 30 GHz - radars, EW and satcoms for RN use
Frequency UHF Ultra high frequency 300 MHz-3 GHz - in the RN usually 225 to 400 MHz & 420 MHz Missiles.
Frequency VHF Very high frequency 30-300 MHz - in the RN usually in excess of 30MHz to 162 MHz
Frequency VLF Very low frequency below 30 kHz. In the 1930's LF was all below 100 kHz - no VLF
FRF Filter radio frequency
FSCE Fleet shore communication engineer
FSCO Fleet shore communications officer
FSK Frequency shift keying where the RF carrier is pulled up or down to achieve the shift.
FST - RN F1 Frequency shift telegraphy
GAA Two tone keyer
GHz GigaHertz
GK185 Two tone keyer
GPTN General purpose telephone network
HCP Hard copy printer
HDB3 High density bipolar - 3
HDLC High level data link control
HF High frequency 3 to 30 MHz - Short Wave -in the RN usually 1.5 to 24 MHz
HFEC High frequency (radio) engineering control
HOA(N) Harbour operations and administration net
HT High tension
Hz Hertz
ICS Integrated communications system
ICW Interrupted carrier keying used when 602E is running on emergency power only.
IDA Integrated digital access
IDF Intermediate distribution frame
IF Intermediate frequency
IFF Indicate friend or foe - radar systems
IFRB International frequency registration board
ISB Separate transmission in each sideband of a TX either side of the TX synthesised frequency
ISDN Integrated services digital network
ISO International organisation for standardisation
ITIMS In-service transmission impairment measuring set
ITL Isolator, telegraph line
ITU International telecommunications union
IVSN Initial voice switched network
kc/s kilocycles (small letter 'k') = kiloHertz (capital H because a mans name) today.
kHz kiloHertz (always a small k)
LAN Local area network
LAP Link access protocol
LAPB Link access protocol (balanced)
LCN Local control Network (radio)/Logical channel number (X25)
LF Low frequency 30 to 300 kHz (In the 1930's this meant all below 100 kHz) - Long Wave
LINCOMPEX Linear Compression and expansion
LO Local oscillator
LPI Low probability of intercept
LRR Lower receiving room
LSB Lower side band in an SSB system. Not normally used in the RN unless when ISB is used
LSI Large scale integration
LT Low tension
LTR Lower transmitting room
M88 Amplifier unit for type 603 transmitter
M89 Amplifier unit for type 604/605 transmitters
MAP Mangement processor (outfit PRB{1})
MCCIS Maritime communications, control and information systems
MCO Main communications office
MCVF Multi channel voice frequency
MCW - A2 Modulated continuous wave - Morse Code using DSB (double sideband)
MDF Main distribution frame
MEP Message processor (Outfit PRA{1})
MF Medium frequency (radio)/Multi Frequency (line)
MFRS Message filing and retrieval system
MHQ Maritime headquarters
MHz MegaHertz (always a capital letter).
MO Master oscillator
MODEM Modulator/Demodulator
MRL Maritime rear link
MSK Minimum shift keying
MSO Main signal office
MTBF Mean time between failures
MTTR Mean time to repair
MWO Main wireless office
NF Noise Filter
NICS NATO integrated communications system
NL Noise Limiter
NRZ Non return to zero
NSTA Naval shore telecommunications authority
NSTN Naval shore telecommunications network
NTE Networking terminating equipment
NTU Network terminating unit
NUA Network user address
NUI Network user identity
OSI Open systems inrerconnection
OTA Off the air
Oufit letter RHT 1-6 Auto HS Transmitters
Outfit letter ACA-AZZ Aerial outfits
Outfit letter AH 1-6 Shore D/F - fixed aerial
Outfit letter Bac-BCz Battery outfits
Outfit letter CAA-CUZ Receiver outfits less CEA, CEZ, CPA, CRZ which are radars
Outfit letter DDA-DZZ AC Supply outfits
Outfit letter EA-EZ Aerial exchange outfits
Outfit letter ESA-ESZ Aerial switching outfits for radar
Outfit letter FH 3-5 HF D/F - fixed aerial
Outfit letter FM 1-15 MF D/F - fixed aerial
Outfit letter FV 1-9 VHF D/F - fixed aerial
Outfit letter GJ-GY Wavemeter outfits
Outfit letter Group A/F Bulkhead insulator
Outfit letter Group AB Type AG deck insulator
Outfit letter Group GA Type OZ deck insulator
Outfit letter Group K Type W deck insulator
Outfit letter HRA-HRZ Radar teachers
Outfit letter JA-JZ Radar indicator outfits
Outfit letter KBA-KBZ Aerial control outfits
Outfit letter KCA-KCZ W/T and R/T control outfits
Outfit letter KDA-KDZ C.W.S. (Central Wireless System) control outfits
Outfit letter KFA-KFZ Fighter direction control outfits
Outfit letter KGA-KGZ Speech control outfits
Outfit letter KHA-KHZ W/T and R/T control outfits
Outfit letter KJA-KJZ Speech control outfits (VOGAD) = Voice operated gain adjusting device.
Outfit letter KMA-KMZ Monitor and R/C outfits for YE and flying aids
Outfit letter KSA-KSZ VHF control outfits on shore
Outfit letter LAA-LAZ Lighting arrestor for shore stations
Outfit letter PDA-PDZ A.I.C. Outfits
Outfit letter QA-QZ Special receivers for radio warfare
Outfit letter RAA-RAZ Radar training sight outfits
Outfit letter REA-REZ Recording outfits
Outfit letter RH 1-3 HF D/F - rotating aerial
Outfit letter RHR 1-6 Auto HS Receivers
Outfit letter RIS 1-6 Radar interference suppressors
Outfit letter RMA-RMZ Radio maintenance room outfits
Outfit letter RTA-RTZ Radar ranging outfits
Outfit letter RU 10-55 UHF D/F - rotating aerial
Outfit letter RV 1-4 VHF D/F in Vans - rotating aerial
Outfit letter SAA-SLZ Shore station R/C outfits
Outfit letter TA-TZ Aerial trunk outfits
Outfit letter TEA-TEZ Tools outfits
Outfit letter TOA-TOZ Test outfits
Outfit letter YAA-YAZ Third office (wireless office) accessory outfits
PA Power amplifier
PABX Public automatic branch exchange
PAD Packet assembler/disassembler
PAM Pulse amplitude modulation
PCC Partial crystal control
PCM Pulse code modulation
PEP Peak envelope power
PJF Patching jack field
PLL Phase locked loop
PPM Pulse position modulation
PRK Phase reverse keying
PSE Packet switch exchange
PSK Phase shift keying
PSS Packet switch stream (BT)
PSTN Public switched telephone network
PTT Postal telegraph and telephone authority
QAM Quadtanture amplitude modulation
QPSK Quadranture phase shift keying
R/C Radar control outfits
R/T Radio telephone
RATT Radio automatic teletype
RCU Radio control unit
RF Radio frequency
RIS Radar interference suppressor
RPI Remote peripheral interface
RX Receiver
RX REB Socket Output from the B40 RX's IF3 for photographic analysis of faults in transmission.
RX REC Socket Output from the B40 RX's detector for disc or wire recorders
SABM Set asynchronous balanced mode
SCOT Small communications terminal
SCYO Secret crypto office
SDLC Synchronous data link control (IBM)
SGT Satellite ground terminal
SNA System network architecture (IBM)
SNAC Secure net alongside communications
SNR Signal to noise ratio
SOP Single operator period
SPC Stored programme control
SPE Single path emission
SPH Special handling
SSB - Various Single side band - see FST, A3A, A3H, A3J, A2J, ISB etc.
STCICS Strike command integrated communications system
STDB Statistical time division multiplexing
STMA Shore telecommunications maintenance authority
T/R Transceiver or transmitter/receiver
TARE Telegraph automatic routeing equipment
TASS Telegraph automatic switching service
TCF Technical control facility
TCU Transmitter control unit
TDM Time division multiplexing
TDMA Time division multple access
TDMG Telegraph distortion message generator
TDSA Telegraph distortion signal analyser
TIMS Transmission impairment measuring set
TR Transmitting room
TRIPLE-X CCITT Recommendation X3, X28, X29
TS Transmitting Station - gunnery control
TWT Travelling wave tube
TX Transmitter
Type number 203 & 5 Control of motor boats
Type number 241-244 Interrogators
Type number 249 Ionospheric sounder
Type number 251-259 Beacons
Type number 262-293 Radars
Type number 303-350 V/S special infra red
Type number 34-89 Transmitters except for 79 = radar
Type number 405-410 Wa/T (Warning Telephone)
Type number 431-434 Hailers
Type number 451-458 SRE (Sound Reproduction Equipment)
Type number 501-527 Buzzer Outfits
Type number 531-537 R/C Outfits (Radar Control for aircraft)
Type number 601-605 HF and MF transmitters
Type number 607-608 Small craft transmitters 608 sea-going 607 coastal waters. Both used the CDR (B28) RX
Type number 610-616 Low power transmitters - transportable and portables
Type number 617 Shore radio transmitter
Type number 618-619 Low power transmitters - transportable and portables
Type number 650-666 RW (Radio Warfare) now EW (Electronic Warfare)
Type number 681-687 Low power VHF
Type number 690-693 UHF transmitters
Type number 900-999 Radars
Type number 91 Jammer anti radar
Type number 92-93 B.A.B.S. (Beam Approach Beacon System for aircraft)
UA Unnumbered acknowledgement
UHF Ultra high frequency 300 MHz-3 GHz - in the RN usually 225 to 400 MHz & 420 MHz Missiles.
UKMACCS UK Maritime coastal communications system
UKNAVCAMS UK Naval communications area master station
UKSUBCAMS UK Submarine communications area master station
UPS Uninterruptabe power supply
URR Upper receiving room
USB Upper side band in an SSB system. Usually, the norm in the RN
UTR Upper transmitting room
VCO Voltage controlled oscillator
VF Voice frequency
VFO Variable frequency oscillator
VHF Very high frequency 30-300 MHz - in the RN usually in excess of 30MHz to 162 MHz
VLF Very low frequency below 30 kHz. In the 1930's LF was all below 100 kHz - no VLF
VSLI Very large scale integration
VSWR Voltage standing Wave Ratio
WAN Wide area network
Wm Wavemeter
WPM Words per minute
XL Crystal
XO Crystal oscillator
XTAL Crystal


RED 1 & 2 Specifications
REH 1 & 2 Specifications
REH 3 & 4 Specifications
REH 5 Specifications
REO Specifications
REP 1 & 3 Specifications
MBA (used in the Seaslug Missile system) Specifications
MBN (used in the Seaslug Missile system) Specifications
MAA (used in Seacat Missile system) To provide the radio control link over which the demands from the aimer's joystick are passed to the SEACAT missile. Specifications
DC AMPLIFIER - used in Radio Relaying. Image
REG Specifications
RES Specifications
CODER-DECODER Specifications
DIGITAL CODER 2 Specifications
DIGITAL CODERS Specifications
TEST SET FOR AERIALS ALK etc Specifications