EVA Antenna
Compiled by Thomas Schwagmeier and Eric Jones
Last revised 11 January 2015
| The photo at bottom left is
a detail from AS11-40-5927.
The EVA antenna has been deployed and stands upright from
a location on a back panel of the Ascent stage just below
the roof line. During the trip out from Earth, the antenna
was stowed in a horizontal orientation as shown in the
line drawings on the right. Prior to the first EVA,
the crew deployed the antenna by turning a T-handle in the
cabin ceiling aft of the docking hatch on the Commander's
side. (Click on the image for a larger version) |
| The following description of the EVA antenna comes from Apollo Experience Report TN D-6974: The EVA antenna was deployed after lunar landing by use of a T-handle located in the LM cabin. The EVA antenna was a pencil-cone antenna consisting of an 8-inch monopole and a 1 2 - inch, 10- radial modified ground plane with an included angle of 40°. The radiation pattern provided omnidirectional azimuthal coverage with a minimum gain of -3 decibels at 0° elevation. These gain magnitudes are with respect to a vertically polarized isotropiC antenna with the EVA antenna in the erected position and terminating in a free-space environment. The EVA antenna was linearly polarized in a vertical plane. |