PCB Renderings

Note: The PCB design was validated on 28th-October-2022 - it works well over HF range (1.8 MHz to 50 MHz).

This project uses the https://github.com/earlephilhower/arduino-pico core.

We have tuned the curve fitting to match that of LUNARIS G6 HF VHF UHF SWR METER from Ceda-Labz.

Install this core in Arduino IDE, and then select Generic RP2040 as the target board.

Cost to build (in INR): Less than 1200 INR including the OLED screen, and PCB from JLPCB.

Build Notes

• Calibration of every build can potentially differ.

BOM + Sources

Download and open ibom.html in your local browser.

• https://robu.in/product/waveshare-rp2040-zero-raspberry-pi-mcu-with-presoldered-header/ (https://rarecomponents.com/ has it too)

• https://robu.in/product/0-96-inch-i2c-iic-oled-lcd-module-4pin-with-vcc-gnd-white/ (5v compatible with 3.3v I2C lines)

• https://www.electronicscomp.com/ (1206 SMD components, https://www.comkey.in/ and https://evelta.com are better sources)

• ST 1N5711 diodes (https://www.semikart.com/)

• BN-43-202 (https://www.semikart.com/)

• https://projectpoint.in/ (24 + 27 SWG winding wire, high quality jumpers)

• https://www.ktron.in/ (SMA edge connector)

References

• https://sites.google.com/site/lofturj/power-and-swr-meter

• https://g8gyw.github.io/ (upstream project, see the binocular toroid windings instructions here)