JANAP 161, Directory of Communications-Electronics Equipment, contains information pertaining to the technical, physical, and operational characteristics of communications equipment used by the departments of the Department of Defense. It is intended primarily for use of signal officers of Army and Mrine Corps divisions and higher headquarters, Navy staff communications officers, and Air Force wing, base, and higher echelons in the planning and coordination of tactical communications in a theater of operations. This JANAP is not intended for use in connection with procurement, storage, and issue.
This publication contains information on radio, wire, sound, light, and other equipment used for purposes of communications.
Only equipment with a status of standard, limited standard, or substitute standard is normally included in this publication. Application of status classifications to equipment of the Department of the Navy is not official but is included for purposes of comparison with equipment of the other departments.
A. General
(1) Items of equipment are arranged and identified in accordance wiht type nomenclature designations of the Joint Communications-Electronic Nomenclature System, or "AN" System, as described in JANAP 196. This system is an alphabetical arrangement of basic indicators, followed by a numberical arrangement of types of equipment for each set or series of basic indicators.
(2) Items of equipment with service, commercial, or other types of nomenclature are arranged under the most appropriate TYPE of AN System/Indicator nomenclature. Within each set or series of basice AN/TYPE designation, equipments are arranged numerically and alphabetically. All such AN/TYPE designations follow items of equipment arranged per subparagraph (1) above.
Examples:
| AN/ARC-33 | AN/FRR-3 | AN/GRR-3 |
| AN/ARC-34 | AN/FRR-4 | AN/GRR-5 |
| AN/ARC-36 | AN/FRR-7 | AN/GRR-7 |
| AN/ARC-Type | AN/FRR-Type | AN/GRR-Type |
| SCR-274 | RAO | BC-312 |
| SCR-522 | RBF | R-274/URR |
| SCR-542 | RBP | RCF |
B. Models. The AN or the AN/TYPE designations on each page normally include all models of equipment bearing those basic nomenclature designations. Minor differences in models are covered in the content of each page. Major differences in models may be covered on separate pages.
C. Index. To facilitate the location of items of equipment in this publication, a comprehensive index provides a listing of all types of nomenclature by which items of equipment may be known or identified.
A. Classification of equipment. Security classifications of items of equipment conform to data contained in JANAP 140 of issue current at date of preparation of each page of information.
B. "Can communicate with". Information given under this heading is based primarily on technical characteristics and operating capabilties of similar or related equipment. The listing of items of equipment does not signify authorization for such use or that items can or every have been so used.
C. Ranges for radio equipment. Information given under this heading is confined to nominal or average communication distances for radio equipment. Limiting factors of terrain, weather, altitude, type of antenna, and similar operating conditions vary the range distances indicated.
D. Major components. Data given under this heading include only the principal operating components and are usually confined to no more than six items. Spare equipment, auxiliary or maintenance components, and modification parts or components are not included.
E. Physical charateristics. Data given under this heading include volume, weight, and dimensions of equipment. These characteristics are given an an aid in planning storage, transportation, shipment, and installation of communication equipment.
F. Project equipment. This marking applied to certain Air Force equipment indicates that the equipment may be used only under special authorization.
Information on each page of the publication is current as of the date indicated on each sheet. Chagnes occuring after this date are to be reflected in subsquent changes to, or revisions of, this publication.
| ac | alternating current |
| ac/dc | alternating current or direct current |
| af | audio frequency |
| AFR | Air Force Regulation |
| am | amplitude modulation |
| amp | amperes |
| approx | approximately |
| ARC | Aircraft Radio Company |
| ASA | Army Security Agency |
| avc | automatic volume control |
| bfo | beat-frequency oscillator |
| CAA | Civilian Aeronautics Administration |
| CAR-RET | carriage return (on teletype keyboard) |
| CB | common battery |
| Co | company |
| comp | component |
| Corp | corporation |
| cps | cycles per second |
| crt | cathode-ray tube |
| cw | continuous wave |
| cyc | cycles |
| db | decibels |
| dbm | decibels per milliwat (sic) |
| dc | direct current |
| dia | diameter |
| ea | each |
| equip | equipment |
| Fed Tel | Federal Telephone and Radio Corporation |
| FIGS | figures (on teletype keyboard) |
| fm | frequency modulation |
| fsk | frequency-shift keying |
| hf | high frequency |
| hr | hours |
| icw | interrupted continous wave |
| if | intermediate frequency |
| in | inches |
| kc | kilocycles |
| kva | kilovolt-amperes |
| LB | local battery |
| lbs | pounds |
| lf | low frequency |
| LTRS | letters (on teletype keyboard) |
| ma | milliamperes |
| MATS | Military Air Transport Service |
| max | maximum |
| mc | megacycles |
| mcw | modulated continuous wave |
| mf | medium frequency |
| mf/hf | medium frequency or high frequency |
| mi | miles |
| min | minimum (also minutes) |
| mmf | micromicrofarads (nowadays: picofarads) |
| mw | milliwatts |
| No. | number |
| opm | operations per minute |
| Qm | Quartermaster |
| quant | quantity |
| RCA | Radio Corporation of America |
| rf | radio frequency |
| rpm | revolutions per minute |
| sec | seconds |
| SOS | international distress signal |
| trf | tuned radio frequency |
| uhf | ultra-high frequency |
| uv | microvolt |
| uuw | micromicrowatts |
| v | volts |
| va | volt-amperes |
| vf | voice frequency |
| vhf | very high frequency |
| vlf | very low frequency |
| vps | vibrations per second |
| w | watts |
| w/ | with |
| WECO | Western Electric Companay |
| w/mtg | with mounting |
| wpm | words per minute |