TM 11-6660-266-13
Section Ill - OPERATION UNDER USUAL CONDITIONS
SECTION CONTENTS
Page
ASSEMBLY AND PREPARATION FOR USE ................................................................ 2-21
INITIAL ADJUSTMENTS, DAILY CHECKS, AND SELF TEST ...................................... 2-38
OPERATING PROCEDURES.. ..................................................................................... .2-41
OPERATION OF AUXILIARY EQUIPMENT .................................................................. 2-46
PREPARATION FOR MOVEMENT .............................................................................. .2-48
2-4. ASSEMBLY AND PREPARATION FOR USE.
2-4-1. Operational Modes. The AN/TMQ-38 is designed to process radiosonde data in two modes of operation;
navigational aids (NAVAID) and radio direction finding (RDF). Setup of the equipment depends on which
mode(s) the AN/TMQ-38 will be operated. The following table identifies which units must be setup for each mode
of operation. When both NAVAID and RDF radiosonde flights are anticipated, the complete system must be
setup.
Mode of Operation
NAVAID
RDF
LRU
MARWIN Processor, A1
X
X
X
X
Printer, A2
X
X
DCT, A3
X
X
Power Supply Unit, A4
NAVAID Antenna Set, A6
X
X
RDF Unit, A8
X
CDU, A9
24 VDC Power Supply, A10
X
Additionally, there are two power source options of primary Input power: 120 VAC, 60 Hz from a utility generator
or commercial source, or 28 VDC from a vehicle battery/generator. The AC power source is required whenever
the MMS is operated in the RDF mode. Either primary power source can be used when the MMS is operated in
the NAVAID mode.
2-4-2. Sitting. For normal operation, the Processor, Printer, DCT, and Power Supply Unit are grouped together at
the operational site for ease of operation either in the open or in a tent and the antennas placed up to 100 ft away
from the operational site.
Proper siting of the RDF and NAVAID antennas is important for good system performance. As a general rule, the
antennas should be placed on the highest reasonably level areas in the immediate vicinity and should be
positioned so that they are not screened by large obstacles such as buildings, thick forests, or high masts of
metal. Additionally, the RDF Unit should be placed a minimum of 100 ft away from the radiosonde launch site
with a clear line of sight between the launch site and the RDF. The site selected for radiosonde launch should be
free of obstacles (power lines, trees, buildings, etc.). If no obstacle-free site is available, select launch location
from which prevailing winds will carry radiosonde away from site without encountering existing obstacles.
2-21
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