Orbital Wire Antenna Deployment Assembly Model 9842 - Manual

Wire Antenna
Deployment
Assembly
Model 9842 Wire Antenna
Deployment
Assembly
Model 9842
Typical Technical Specifications:
Introduction
Wire Antenna Deployment Assembly (WADA) Model
9842 was developed for the International Solar
Terrestrial Physics (ISTP) program’s WIND satellite – WAVES
experiment. This motorized mechanism is
capable of extending and retracting a wire antenna up to
360.8 feet (110 meters) long, perpendicular to the satellite
spin-axis. The antenna is a stranded beryllium-copper wire
measuring 0.015 inch (0.038 cm) diameter, with a
tensioning tip mass attached to the outer end. Either bare
or insulated wire may be used. The deployer features electrical and mechanical stops at both full-extension and
-retraction. A potentiometer, driven by the moving antenna
wire, provides a continuous indication of the deployed
length. This deployment mechanism is designed to meet
the requirements of document MIL-A-083577A (USAF) for
Moving Mechanical Assemblies for Space and Launch
Vehicles. Similar units were used on Dynamics Explorer-1
& 2, International Sun-Earth Explorer, San Marco D/L &
the Combined Release & Radiation Effects Satellite. This
unit can be deployed or retracted in orbit.
Antenna Wire
Deployed Length: Up to 360.8 ft
(110 meters)
Diameter —
W/out insulation: 0.015 in
(0.038 cm)
With insulation: 0.032 in
(0.081 cm)
Material &
Construction:
Beryllium
Copper
Insulation Material: Teflon
(per MIL-W-
16878)
Weight —
W/out insulation: 0.361 gr/ft
(1.184 gr/m)
With insulation: 0.605 gr/ft
(1.985 gr/m)
Deployer
Height: 7.21 in (18.31 cm)
Length: 14.96 in (38 cm)
Width: 7.50 in (19.05 cm)
Total Unit Weight: 5.51 lbs (2.5 kg)
Drive Motor: Brushless D.C.
Power: 14 Watts maximum
Voltage: 24-32 Vdc
Deployment Rate: Approximately
1.2 in/sec
(3.05 cm/sec)
Tip Mass: 10 ± 0.1 gram
Operating
Temperature Range: -10°C to +50°C
Qualification
Temperature Range: -20°C to +60°C
Survival
Temperature Range: -25°C to +65°C