OWLRC recently came up with a compact and affordable SWR meter, which measures 5.8 antennas. It has a simple UI, a bright touchscreen and works on 3S (I use a 12V DC power supply).
When it comes to antenna testing, the SWR value is not an end-all be-all measurement - especially at the level of accuracy this SWR Meter can offer. But it can be a useful metric, especially when troubleshooting damaged antennas, bad adapters / extensions etc.
According to OWLRC, each unit is calibrated as a whole, with its built-in VTx unit. Keep in mind that it is not a laboratory-grade equipment - nor is its price though!
For this reason, I would suggest not to rely on the raw measurements of the unit but to first test a good antenna in good condition and use the results as a baseline when measuring other antennas.
Unfortunately the data cannot be exported, so manual logging while scrolling along the graph to view the datapoints is the only way with this SWR meter.
Tests are done at 200mW, so make sure you don't use this SWR meter near other pilots.
This is BEST FOR LESS: OWLRC SWR meter overview and basic antenna testing - Let's go!
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