Measuring 2.4 GHz SWR using a directional coupler.
SWR meters for those frequencies are normally expensive. There is a way to do good measurements using a directional coupler. I got myself this one for 9 $:
A simple BAT diode detector is easiy made:
1/2 BAT15-099---|>|-------------------- | | |/ [ ] === O Volt meter | 1k | 1n |
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This 2.4 GHz linear:
Good SWR (not much reflected):
And with a metal object disturbing the antenna:
By reversing in and output from the directional coupler you can get the forward voltage, and then you can calculate the SWR.
Here the method is described in more detail:
Most expensive and most complicated part is the connectors, seems everybody uses something else...
So, some giggle Hertz tronix for the day.