RF Bridge

I spotted on eBay this RF Bridge, with 50R resistors and a Balun output transformer.



I have connected it to my VFO, which uses an AD9851 + MMIC amplifier (10mW output), and to my RF power meter built with an AD8307 log detector and able to display 1uW to 10W power! The result is that I can take a look at the resonant frequency of an antenna, the Wonder Wand tuneable loop.





This is the result over the 40m band: