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Spider Antenna
Principal of the spider antenna:
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The self build spider antenna is based on four stepper motors, and two software defined radios (SDR): The receiving SDR (USRP B210 from “Ettus Research”) is connected to the four motors by nylon ropes, as illustrated in the figure; by this, an arbitrary path in three dimensions can be traced. The transmitting SDR is a USRP B200, which is placed along a line parallel to the measurement area. In this configuration the setup can measure within a volume of up to 2m x 2m x 1.8m.

Hardware realisation:
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The figure shows the electronis to drive the spider antenna. The four motor are connected over the XLR conncetors. An Arduino is used to drive each stepper motor seperatly.
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The figure shows an example for one stepper motor realisation, which is currently attached in the cornerstone holder.