Cheapest 5.8g VSWR Meter (for FPV antenna)

thingiverse

Hello, I present to you the cheapest 5.8g VSWR meter for measuring your FPV antennas. Although it's a far cry from an Anritsu/ Agilent VNA, it gives the best accuracy for the buck! A couple years back, I built an analog vswr meter using an old school multi-meter. While that works great as a tool for tuning my DIY FPV antennas (on my youtube channel), having to read the needle off a self-conjured swr scale (printed on paper) is not ideal for accuracy. Thus, I made this to achieve better accuracy, build + demo in the video above. http://www.youtube.com/watch?v=Y0CZb1XxvPY Parts Needed: 1. 1-8000MHz AD8318 RF Logarithmic Detector (from banggood, analog, etc) 2. Directional RF Coupler ~ 6GHZ or higher (from ebay) 3. 20db RF attenuator/ micro pad ~ 6GHZ (from ebay) 4. Digital multi-meter with reading of 2 decimal places (from dx, banggood, etc) 5. Spare test leads for digital multi-meter (from dx, banggood,etc) 6. 5.8ghz 200mw video transmitter with SMA / RP-SMA (getfpv, banggood, etc) 7. Various RF adapters -refer to video (from ebay) 8. 3S lipo pack (from local hobby shop) or 9v battery (almost anywhere) 9. JST male and female plugs, 3S balance connector (from ebay, aliexpress, etc) or 9v battery connector strap (from local hardware shop) Tools: 10. Hot glue gun and hot glue 11. Soldering iron, flux and solder lead 12. Computer or smart device (for the computing of standing wave ratio)