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This article listsAmerican militaryelectronicinstruments/systems along with brief descriptions. Thisstand-alone list specifically identifies electronic devices which are assigned designations (names) according to theJoint Electronics Type Designation System (JETDS) beginning with theAN/ prefix. They are grouped below by the first designation letter following this prefix. The list is organized as sorted tables that reflect thepurpose,uses and manufacturers of each listed item.

JETDS nomenclature

All electronic equipment and systems intended for use by theUS military are designated using theJETDS system. The beginning of thedesignation for equipment/systems always begins withAN/, which only signifies that the device has a JETDS-based designation (or name). When the JETDS was originally introduced as theunclassified Joint Army-Navy Nomenclature System (JAN),AN represented allArmy-Navy electronic equipment. Later, the naming method was adopted by allDepartment of Defense branches, and others likeAustralia,Canada,NATO and more.

The first letter of the designation following AN/ indicates theinstallation orplatform where the device is used (e.g.A for piloted aircraft). That means a device with a designation beginning "AN/Axx" would typically be installed in a piloted aircraft or used to support that aircraft. The second letter indicates thetype of equipment (e.g.A for invisible light). So,AN/AAx would designate a device used for piloted aircraft with invisible light (likeinfrared orultraviolet light) sensing capability. The third letter designates thepurpose of the device (e.g.R for receiver, orT fortransmitter). After the letters that signify those things, a dash character ("-") is followed by a sequential number that represents the next design for that device. Thus as one example,AN/ALR-20 would represent:^[1]

• Installation in a piloted aircraft:A
• Type of countermeasures device:L
• Purpose of receiving:R
• Sequential design number:20

So, the full description should be interpreted as the 20th design of an Army-Navy (or allDepartment of Defense) electronic device for a countermeasures signal receiver.

NOTE: LettersE, H, I, J, L, N, O, Q, R, X andY are not used in the first-position ofJETDS nomenclatures.