TM 11-6625-1559-12
INTRODUCTION
Section I. GENERAL
Shipment Report (DISREP) (SF 361) as prescribed
in AR 55-38/NAVSUPINST 4610.33B/AFR 75-18/
This manual describes Generator, Signal Sweep
MCO P4610.19C, and DLAR 4500.15.
AN/USM-203. It covers instructions for operation
and installation, and for operator and organiza-
1-3.1. Reporting Equipment Improvement
tional maintenance, cleaning and inspection of the
Recommendations (EIR)
equipment, and replacement of parts available to
EIR's will be prepared using Standard Form 368
the operator and organizational repairman.
(Quality Deficiency Report). Instructions for pre-
1-2. Indexes of
Publications
paring EIR's are provided in TM 38-750 (The Army
Maintenance Management System). EIR's should
a. DA Pam 310-4. Refer to DA Pam 310-4 to
be mailed direct to Commander, US Army Com-
d e t e r m i n e whether there are new editions,
munications and Electronics Materiel Readiness
changes, or additional publications pertaining to
Command, ATTN: DRSEL-ME-MQ, Fort Mon-
the equipment.
mouth, NJ 07703. A reply will be furnished direct to
b. DA Pam 310-7. Refer to DA Pam 310-7 to
you.
determine whether there are modification work
orders (MWO's) pertaining to the equipment.
1-3.2. Administrative Storage
There are no special procedures for preparing this
equipment for limited storage. Place all ancillary
a. Reports of Maintenance and Unsatisfactory
Equipment. Maintenance forms, records, and re-
bag to the equipment. Place equipment in an
ports which are to be used by maintenance
organizational storage room. Protect equipment
personnel at all maintenance levels are listed in
from dust, humidity, and extreme temperature
and prescribed by TM 38-750.
changes.
b. Report of Packaging and Handling Deficien-
cies. Fill out and forward DD Form 6 (Packaging
1 - 3 . 3 . Destruction of Army Electronics
Improvement Report) as prescribed in AR 700-
Materiel
5 8 / N A V S U P I N S T 4030.29/AFR 71-13/MCO
Destruction of Army electronics materiel to pre-
P4030.29A, and DLAR 4145.8.
vent enemy use shall be in accordance with TM
c. Discrepancy in Shipment Report (DISREP)
750-244-2.
(SF 361). Fill out and forward Discrepancy in
frequency response, gain and bandpass of receiv-
a. Generator, Signal Sweep AN/USM-203 is a
resonant circuits. It can also be used to measure
portable, wide-band radio frequency (rf) generator
the sending-end impedance of a loaded transmis-
with a frequency range of 500 kiloHertz (kHz) to
1,200 megaHertz (MHz), and sweep widths vari-
able from 10 kHz to 400 MHz. The unit produces
1-5. Technical Characteristics
crystal-controlled, pulse-type frequency marker
Frequency range:
signals at 1, 10, and 100 MHz and at all multiples of
Vhf (wide and
these frequencies within the range of the unit.
n a r r o w ) . . . . . . ...500 kHz to 400 MHz.
Also, provisions are made for the insertion of one or
Unf (narrow) . . . . . . . .350 MHz to 1,200 MHz.
two externally generated marker signals.
UNF (wide) . . . . . . .275 Mhz to 1,100 M H z
Throughout this manual, Generator, Signal Sweep
Sweep width:
Vhf (narrow) . .. . . . . . ..10 kHz or less minimum:
SG-593/U (the main component of Generator,
1 MHz or more maximum.
Signal Sweep AN/USM-203) will be referred to as
Vhf(wide) . . . . . . . . . . ..500 kHz or less minimum;
t h e sweep generator.
400 MHz or more maximum.
b. The
sweep generator can be
used in
conjunc-
Unf (narrow) . . . . . . . . . 10 kHz or less minimum;
1 MHz or more maximum.
Change 3