In 1935 a commission to produce an antenna with omnidirectional radiation, i . e . equal at all points of the compass, led him to develop the turnstile antenna, so-called because it looked like a turnstile.
12.
A "'turnstile antenna "', or crossed-dipole antenna, is a radio antenna consisting of a set of two identical dipole antennas mounted at right angles to each other and fed in phase quadrature; the two currents applied to the dipoles are 90?out of phase.
13.
The seismometer was encased in the lunar capsule along with an amplifier, a 50 mW transmitter, voltage control, a turnstile antenna, and six silver-cadmium batteries capable of operating the lunar capsule transmitter for 30 days, all designed to land on the Moon at 130 to 160 km / h ( 80 to 100 mph ).
14.
The seismometer was encased in the lunar capsule along with an amplifier, a 50-milliwatt transmitter, voltage control, a turnstile antenna, and 6 silver-cadmium batteries capable of operating the lunar capsule transmitter for 30 days, all designed to land on the Moon at 130 to 160 km / h ( 80 to 100 mph ).
15.
The seismometer ( code-named " Tonto " ) was encased in the lunar capsule along with an amplifier, a 50 mW transmitter, voltage control, a turnstile antenna, and six silver-cadmium batteries capable of operating the lunar capsule transmitter for 30 days, all designed to land on the Moon at 130 to 160 km / h ( 80 to 100 mph ).
