Flathagen blogged about his DIY SWR meter project: The circuit is based on two AD8307 log amplifiers, which are connected to the forward and reflected ports on a directional coupler. The AD8307 amplifiers gives a DC voltage of about 25mV/dB of the input signal, which is amplified using an opamp (LM324). The opamp also provides the […]
Tag Archives: SWR
Directional coupler
Flathagen blogged about his DIY directional coupler: It is simple to construct the directional coupler. The transformers are FT50-43 toroid cores with 32 turns of 24 AWG enamel wire. The primary winding is simply a piece of RG58 through the torioid (i.e., one turn). Different designs use different toroids and number of turns. I settled […]
A homebrew Tayloe SWR indicator
TJ Campie wrote a post on his blog detailing his DIY SWR indicator/bridge build: Dan Tayloe, N7VE, developed a really neat resistive SWR bridge that uses a simple LED to identify the dip in SWR on an antenna. QRPkits.com sells a nice kit of the bridge for just $15 and I recommend that if you don’t already have […]