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aSDR1

v129	v130
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381		<b> Analysis: </b> The left image shows the signal power that is received by transmitters connected via wire to the spectrum analyzer transmitting signals at various frequencies. As evident, they are showing a consistent (linear) increase in power as gain is increased. Conversely, the image on the right shows a rather scattered graph. This is the graph of the same transmitters transmitting via antennas, as opposed to wires. This shows that the wire transmission minimizes propagation errors while wireless transmission is prone to these errors.
	381	<b> Analysis: </b> The left image shows the power output of the receiver at the frequency of 1 GHz. As mentioned above, the receiver was calibrated using a wire, signal generator and wiserd. The graph shows a steady increase in output beteen -110 to -60 dBm power input. Using the same carrier frequency, a signal power to distance graph was generated using the calibrated and standardized transmitter and receiver. The calibration obviously made a difference since the data points are not so scattered anymore, even when propagation is wireless, and are much closer to the theoretical free space loss model. The next step was to localize the transmitter using the data in the receivers.
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