Using the original schematic as a starting point, I reworked the electrical diagram and incorporated an A4988/DRV8825 module. You can…
Continue ReadingAutomatic Magnetic Loop Tuner – A4975STB, A4988 or DRV8825
The design Loftur published on the project site was built around two A4975SBT ic’s. Although they are available at digikey.com…
Continue ReadingAutomatic Magnetic Loop Tuner – SWR Bridge In A RF Shielded Box
Since we are dealing with RF we have to keep it away from all other components and equipment in our…
Continue ReadingAutomatic Magnetic Loop Tuner – SWR Bridge
While reading the frequency from the radio, and having the “antenna characteristics” in the tuner’s memory, there is no real…
Continue ReadingAutomatic Magnetic Loop Tuner – Soldering Components
When all components were delivered, it was time to put them all together. The effort I spent writing custom references…
Continue ReadingSontheimer Bridge – SWR Bridge
For the Automatic Magnetic Loop Tuner project I needed an SWR Bridge (Standing Wave Ratio) which could handle 200 W.…
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