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Chapter 1. INTRODUCTION - TM-11-6660-204-250011
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TM-11-6660-204-25 Radiosonde Recorders AN/TMQ-5 AN/TMQ-5A AN/TMQ-5B and AN/TMQ-5C Manual
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Measuring Circuit - TM-11-6660-204-250013


TM 11-6660-204-25
FUNCTIONING OF EQUIPMENT
BLOCK DIAGRAM EXPLANATION
Section I.
order of their signal functions and the compo-
2-1. Purpose and Use
nents are referred to by functional common
a.  General.  R a d i o s o n d e Recorder AN/
names. A list of components by nomenclature and
TMQ5 ( * ) graphically records radiosonde data
common  n a m e is  contained  in  TM  11-
representing atmospheric pressure, temperature,
6660-204-10.
and relative humidity received by Rawin Set
b. Converter-Amplifier Chassis. The converter-
AN/GMDl ( * ). The latter equipment is a receiv-
amplifier chassis contains Signal Data Converter
ing-type direction finder which receives the sig-
CV-146 ( * )/TMQ-5; this includes the signal con-
nals transmitted by a balloon-borne radiosonde set
version circuits (all circuits between the input
with or without a hypsometer. The received intel-
and the detector), the detector, and a major por-
ligence from the rawin set is fed to the recorder
tion of the servoamplifier system. Input signals
in the form of audio frequency pulses that range
that will properly excite the converter and deliver
nominally from 10 to 200 cps. A preflight calibra-
reliable output data must fall within the limits of
tion establishes the relationship between audio
the following specifications:
frequency and both temperature and relative hu-
midity. The received data printed graphically is
(1. ) They must have an amplitude in the
converted into actual temperature and relative hu-
range of 10 to 100 volts, peak-to-peak.
midity values by Computer, Humidity-Tempera-
(2) Their recurrence frequency must be
ture CP223 ( * ) /UM. Pressure information is ob-
below 250 cps.
tained by reference to the pressure-calibration
(3) Their shape should be classified as sine,
chart furnished with each individual radiososde
square, sawtooth with positive-going slope, or
set.
negative pulses. (Sine waves of higher am-
plitude than 100 volts peak-to-peak may be used.)
b. Block Diagram. A simplified block diagram
The af signals are converted to a predetermined
of this recorder is covered in TM 11-6660204-10,
shape and amplitude, and are then rectified and
describing its function with respect to the com-
filtered, The resultant dc signal to the detector is
plete radiosonde system. A more detailed block
directly proportional to the recurrence frequency
diagram analysis (fig. FO-1 ) is discussed below.
of the input signal which is suitable for applica-
tion to the remainder of the recorder circuits
2-2. Electronic Circuit Functions Block
(wave shape and amplitude are not factors). This
Diagram Analysis
linear result is explained in detail in paragraph
2-11. Provision is made for aural monitoring of
a.  General.  R a d i o s o n d e Recorder AN/
the signal by means of a speaker located on Con-
TMQ-5 ( * ) consists of six major components:
trol Panel C-834/TMQ-5.
Control Panel C-834(*) /TMQ5, Signal Data
Converter CV-146 ( * ) /TMQ-5, Frequency-Time
c. Detector. The detector, located in the convert-
Recorder RD-88 ( * ) /TMQ-5, Power Supply
er-amplifier chassis, receives two dc voltages; one
PP-968 ( * ) /TMQ5, Equipment Cabinet Subas-
from output tube V307, and the other from the
sembly MX-1482/TMQ5, and Electrical Equip-
contact arm on slide-wire potentiometer R501B in
ment Cabinet CY1390 ( * ) /TMQ5. Functional
the measuring circuit. When a difference exists
circuits, however, are not always completely con-
between these two voltages, an ac error voltage is
tained in a particular chassis but are distributed
developed, the frequency of which is equal to that
throughout two or more major components in
of the power line (nominally 60 cps). This error
some instances. The circuits are presented in the
voltage is applied to the servoamplifier circuits to
Change 3


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