Square-Loop Field
February 04, 2012 20:14 PM
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Square Loop Radiation Field (E-Plane)
Below is the plot of the data I collected for a single square loop. The test jig is a short tower that was rotated by a stepper motor so that I could stay stationary to make the measurements. The controller would rotate the tower in 18o increments and then key an HT for 5 seconds before going to the next angle.
The direction of the strongest lobe is in the direction of the gamma-match (opposite the gap).
Here is a picture of my test jig. On the piece of wood is mounted the tower assembly which has a fairly large stepper motor, a small PC power supply, and the controller board. The controller board has an Atmel ATMega103 microcontroller, motor stepper drivers, a couple of MOSFETS and other miscellaneous parts. Basically the only connections to it are power, a serial line I use for control, a cable to the stepper motor, and a cable that goes to the HT PTT line. Not shown is the HT.
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