TM 750-5-3
AN/GMD-1( )
Figure 4. Rawin Set AN/GMD1 ( ).
1. NOMENCLATURE: Rawin Set AN/GMD-1( ).
6. TECHNICAL CHARACTERISTICS:
Power input _ _ _ _ _ _ _ _ _ _ _ 105 to 129 vac, 50 to
2. TYPE CLASSIFICATION: Standard A.
65 Hz, 1,000 W.
3. SECURITY REQUIREMENTS: Unclassified.
Frequency _ _ _ _ _ _ _ _ _ _ _ _ _ 1,660 to 1,700 mHz.
Type of reception _ _ _ _ _ _ _ _ _ Am or fm.
4. PRIMARY USE OR CONCEPT OF EMPLOYMENT:
Used to track a balloon-borne radiosonde transmitter.
Altitude _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 100,000 ft or 30,480
meters.
5. BRIEF FUNCTIONAL DESCRIPTION: Rawin Set AN/
Horizontal distance _ _ _ _ _ _ _ _ _ 125 mi.
GMD1( ), a transportable radio direction finder, auto-
RF system:
matically tracks a balloon-borne radiosonde transmitter.
Conieal.
Scanning type _ _ _ _ _ _ _ _
Signals representing meteorological data, transmitted by
Antenna type _ _ _ _ _ _ _ _ _ _ Single dipole.
the balloon-borne radiosonde transmitter, are received,
Reflector type _ _ _ __ _ _ _ _ _ Parabolic.
amplified, and detected by Rawin Set AN/GMD1( ).
Receiving system:
Wind data is evaluated by using the print-out information
Type receiver _ _ _ _ _ _ _ _ _ _ Superheterodyne.
from equipment Control Recorder C-577/GMD-1 of Rawin
Normal frequency _ _ _ _ _ _ _ 1,680 MHz.
Set AN/GMD-1( ) and meteorological information for
30 MHz.
Intermediate frequency _ _
values of temperature, pressure and humidity from Radio-
Frequency control _ _ _ _ _ _ _ Automatic and manual.
sonde Recorder AN/TMQ-5( ). These measurements are
Input impedance _ _ _ _ _ _ _ 50 ohms nominal.
used to analyze and forecast weather conditions, guide and
Bandwidth _ _ _ _ _ _ _ _ _ _ _ Sharp, 0.75 0.15
plan for the navigation of aircraft, and prepare ballistic
MHz; broad 1.5
corrections for the effect of the atmosphere on the trajec-
0.3 MHz.
tory of projectiles, missiles, and rockets.
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