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Military Radio Test Set AN/GRM-55 With Manual NEW Item
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Military Radio Test Set AN/GRM-55 With Manual NEW Item
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Military Radio Test Set AN/GRM-55 With Manual NEW In Box NSN 6625-00 Purpose The GRM-55 Test Set is designed to stimulate the PRC-25 with RF and audio signals and to measure the signals present on the module test points. The results of each test appear as a go (green light) or no-go (red light). Included with the test set is a cable to allow accessing the audio and power lines of the PRC-25 POWER connector that also provides DC voltage to the GRM-55. The box on this cable also has a jumper plug like the one on the radio so you should be able to power both the GRM-55 and the radio using any external source that has the correct plug like a test adapter . T are no internal batteries. A short BNC(m) to BNC(m) Cable is needed to use the GRM-55 but the lid does not have clips to hold one. Operation Maintenance On test sets that have not been used for some time the rubber gasket between the lid and case sticks to the case when the lid is opened. To fix this clean the case lip and apply a light coat of silicon grease to the case lip and cycle the lid a few times. Manuals TM 11-6625-514-12 TM 11-6625-514-20P TM 11-6625-514-45P Use with other Radios This test set should also work on the PRC-77 since the "POWER" and "ANT" connectors function in the same way and most of the module test points are the same. Has anyone done this? Joint Electronics Type Designation System The Joint Electronics Type Designation System (JETDS) , which was previously known as the Joint Army-Navy Nomenclature System (AN System) and the Joint Communications-Electronics Nomenclature System , is a method developed by the U.S. War Department during World War II for assigning an unclassified designator to electronic equipment. JETDS is described in detail by MIL-STD-196 . Electronic materiel, from a military point of view, generally includes those electronic devices employed in data processing, detection and tracking (underwater, sea, land-based, air and space), recognition and identification, communications, aids to navigation, weapons control and evaluation, flight control, and electronics countermeasures. Nomenclature is assigned to: Electronic materiel of military design Commercial electronic materiel that has been modified for military use and requires military identification and design control Electronic materiel which is intended for use by other Federal agencies or other governments that participate in the nomenclature system. In the JETDS system, complete equipment sets or systems are designated with a sequence of letters and digits beginning with AN/ , then three letters, a hyphen, a number, and (occasionally) some optional letters. The three letters tell w the equipment is used, what it does and its purpose. For example, the AN/PRC-77 is a P ortable R adio used for two way C ommunications. The numbers for any given type of equipment are assigned sequentially, thus higher numbers indicate more modern systems. Computer software and commercial unmodified electronics for which the manufacturer maintains design control are not covered. Systems with variable complements have a parenthetical V, "(V)," added to the type designator. (T) indicates training systems. Subsystems ("groups") are designated by a two letter code, followed by a number, followed by slash and one, two or three letters from the three letter codes for systems. For example, BA-1234/PRC would be a battery for portable radio sets. The three letter codes have the following meanings: First letter: installation G - General Ground Use Second letter: type of equipment R - Radio Third letter: purpose M - Maintenance or Test Purpose: AN/GRM-55is a test set for PRC-25 . It provides the radio with HF- and audio signals and measures signals on the test points of the modules. Results are shown by: · green Light : ok or · red Light: bad . Clips in the lid hold: three small spare bulbs and three cables . Numbers of the cables: ... 
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