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rotary joint
A novel two-way rotary joint (S and P band) is described.
      
For S band rotary joint, VSWR is less than 1.2 over the frequency range from 1.2GHz to 4.4GHz.
      
For P band rotary joint, the structure of the reentrant resonator is used to reduce the length of the rotary joint to about λ/4, and the special and small size requirement is satisfied.
      
Each path includes a rotary joint required for gimbaling the antenna into position at the start of the mission.
      
Field Change Two was the insertion of a rotary joint within the antenna, providing a constant 360 degree rotation capability.
      
Figure C-14 shows a rotary joint in each of the two attachment configurations.
      
Non-normalized radar emission spectra measured at four azimuths relative to the base of the radar transmitter antenna rotary joint.
      
No difference was observed between emission spectra at four azimuths separated by 90 degrees relative to the base of the rotary joint of this radar.
      
One of the requirements for most mechanical designs is some form of rotary joint.
      
Rotary joint with low loss and optical fibres for the transportation of signals are today available.
      
Radar emission spectra on four azimuths relative to the base of the rotary joint, normalized to 0 dB maximum power at the fundamental frequency.
      
Rotary joint modules are available with various sizes, strengths and speeds.
      
Since there were no commercially available rotary joints adequate for a space environment, JPL developed a suitable rotary joint.
      
Total loss using cable-wrap is about 1.2 dB compared to 0.5 dB for RF rotary joint.
      
Two rotary joint units allow the cold water to flow from the Earth-bound frame into the rotating frame.
      
This configuration using RF rotary joint, slip rings and balanced payload proved very efficient for this application.
      
The RF rotary joint is co-axial with the slip ring.
      
There are six rotary joints in the RMS, and each rotary joint corresponds to one DOF.
      
The antenna system must have a rotary joint to point the HGA back at the Earth through two degrees of rotational freedom.
      
The best way to meet this requirement is to use a rotary joint.
      
 

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