Chapter 2. FUNCTIONING OF EQUIPMENT - TM-11-6660-204-250012

TM 11-6660-204-25

CHAPTER 2

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

(fig. FO-1 )

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

2-1