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 TB 43-0117
UNIT INDICATORS (Cont'd)
UNIT
EXAMPLE OF USE
IND.
FAMILY NAME
FR
Freq measuring devices -------------------------- Freq meters, tuned cavity
G
Generators, power --------------------------------- Electrical power w/o prime movers
H
Head, hand, chest sets --------------------------- Includes earphone
HD
Environmental apparatus------------------------- Heating, cooling, dehumidifying,
pressure, vacuum devices
ID
Indicator units, non-
cathode-ray tube------------------------------------ Calibrated dials and meters, indi-
cating lights
IM
Intensity measuring
devices------------------------------------------------ Includes SWR gear, field intensity
and noise meters, slotted lines
IP
Indicator units, cathode-
ray tube ----------------------------------------------- Azimuth, elevation, panoramic
J
Interface units --------------------------------------- Interconnecting and junction units
KY
Keying devices -------------------------------------- Mechanical, electrical and electronic
keyer, coder, interrupters
LS
Loudspeakers -------------------------------------- Separately housed loudspeakers,
intercommunication stations
M
Microphones----------------------------------------- Radio, telephone, throat, hand
MD
discriminators --------------------------------------- Device for varying amplitude, freq
or phase
ME
Meters------------------------------------------------- Multimeters, volt-ohm-milliammeters,
vacuum tube voltmeters, power meters
MK
Miscellaneous kits---------------------------------- Maintenance, modification
ML
Meteorological devices---------------------------- Miscellaneous meteorological equip
MT
Mountings -------------------------------------------- Mountings, racks, frames, stands
MX
Miscellaneous --------------------------------------- Equip not otherwise classified
MU
Memory units ---------------------------------------- Memory units
O
Oscillators -------------------------------------------- Master freq, blocking, multivibra-
tors (for test oscillators, see SG)
OS
Oscilloscope, test ---------------------------------- Test oscilloscope for general test
purposes
PL
Plug-in units ----------------------------------------- Plug-in unit not otherwise classified
PP
Power supplies-------------------------------------- Non rotating machine type such as
vibrator pack, rectifier, thermo-
electric
PT
Mapping and plotting
units --------------------------------------------------- Electronic types only
PU
Power equipments --------------------------------- Rotating power equip, motor generator,
dynamotors
R
Receivers -------------------------------------------- Receivers, all types except telephone
RD
Recorder-reproducer ------------------------------ Sound, graphic, tape, wire, film,
disc, facsimile, magnetic, mechanical
E-5
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