The wiring is shown in above photo, which is really straightforward. Looks promising! Next i have to find an antenna or so with a known resonance frequency, and test if this little contraption can find the sweet spot. I know it will give horrible performance on such a board, but i just wanted to see if the concept works. In my case the input pins of the arduino have a high enough impedance and the signal should be significant enough to get at least some reading, so in this stage I'm omitting the op amp for simplicity. A link to the article is given in the links section. The github repo will also contain some sketches to test the hardware, for example an i2c bus scanner to search for the Si address and a minimal sketch to just set a frequency on the clock outputs. The Si library used is the Etherkit one, since it is much easier to use than the Adafruit one.
#SI5351 PROTEUS LIBRARY PC#
The difference is that the ESP32 will have the logic to do the frequency sweep and will generate the SWV freq plot, and in the Arduino case a PC side python script will send commands to the arduino to change the frequency and plot the resulting swr measurements. Wiring the ESP32 or the Arduino nano to the Si requires 4 wires power and gnd, and the i2c data and clock lines. The uC will set the frequency of the Si via the i2c bus, and measure the voltage of both the waves on two separate analog inputs, via the swr bridge. This work is greatly inspired by the work of K6BEZ on a low cost antenna analyzer, a link to his slides can be found in the links section. The main reason for this project is to find the resonant frequency of loop antennas I'm intending to build for the 20m HAM band. To make the experience fit your profile, pick a username and tell us what interests you.
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