In the " normal mode " or " broadside " helical antenna, the dimensions of the helix ( the diameter and the linearly polarised parallel to the helix axis.
12.
Lunokhod 1 was equipped with a cone-shaped antenna, a highly directional helical antenna, four television cameras, and special extendable devices to impact the lunar soil for density measurements and mechanical property tests.
13.
In an axial-mode helical antenna the direction of twist of the helix determines the polarisation of the radio waves : a left-handed helix radiates gain when receiving right-circularly-polarised signals, and vice versa.
14.
In order to receive HRPT transmissions a high gain antenna is required, such as a small satellite dish, a helical antenna, or a dish tracking controller are required to steer the Azimuth-Elevation unit controlling the parabolic dish.
