Section I. GENERAL
This technical manual contains operating instructions and maintenance procedures for Monitor Radio Frequency
R-2176/FRN, hereinafter referred to as the monitor receiver. The maintenance tasks are limited to those
authorized at the operator category.
1-2. Indexes of Publications
DA Pam 310-4. Refer to the latest issue of DA Pam 310-4 to determine whether there are modification work
orders (MWO's), new editions, changes or additional publications pertaining to the equipment.
1-3. Maintenance Forms, Records, and Reports
Reports of Maintenance and Unsatisfactory Equipment. Department of the Army forms and procedures
used for equipment maintenance will be those prescribed by TM 38-750, The Army Maintenance Management
b. Report of Item and Packaging Discrepancies. Fill out and forward SF 364 (Report of Discrepancy (ROD))
as prescribed in AR735-11-2/DLAR4140.55/NAVMATINST 4355.73/AFR 400-54/MCO4430.3E.
c. Discrepancy in Shipment Report (DISREP) Fill out and forward Discrepancy in Shipment Report (DISREP)
(SF 361) as prescribed in AR 55-38/NAVSUPINST 4610.33B/AFR 75- (SF 361). 18/MCO P4610.19C and DLAR
1-4. Administrative Storage
Administrative storage of Monitor, Radio Frequency R-2176/FRN is from 1 to 45 days and may be
accomplished as follows:
a. Storage Site. The equipment should be stored in an area specifically marked "Administrative Storage."
The area should be covered and protected from the elements.
b. Maintenance Services. Before storage, perform the next scheduled major preventive maintenance
c. Inspection. Inspect the equipment for proper operation before storage. Do not store inoperable
d. Protection. Protect the equipment by storing it in the boxes and packaging material in which it was
shipped. Be sure to put a fresh desiccant bag in each package (NSN 6850-0-264-6572).
1-5. Destruction of Army Electronics Materiel
Destruction of Army electronics materiel to prevent enemy use shall be in accordance with TM750-244-2.
1-6. Reporting Equipment Improvement Recommendations (EIR)
If your Monitor, Radio Frequency R-2176/'FRN needs improvement, let us know. Send us an EIR. You, the
user, are the only one who can tell us what you don't like about your equipment. Let us know why you don't like
the design. Tell us why a procedure is hard to perform. Put it on an SF 368 (Quality Deficiency Report). Mail it
to Commander, US Army Communications and Electronics Materiel Readiness Command, ATTN: DRSEL-ME-
MQ, Fort Monmouth, NJ. 07703. We'll send you a reply.
Section II. DESCRIPTION AND DATA
1-7. Purpose and Use
The monitor receiver is a fixed-tuned, non-directional beacon (NDB) monitor specifically designed to verify
continuously the operational readiness of an associated NDB transmitter.. The monitor receiver is shown in
a. The antenna assembly comprises a one-meter long whip and a matching module. The signal
transmitted by the NDB transmitter is picked up by the whip antenna and fed to the receiver through the