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phase_measurement_board
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Jojeee 2022-08-03 12:59:36 +01:00
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# What even is this?
* It is a small board that will help measure the phase offset between a reference signal and 1/4 inputs.
* A quick and dirty way of knowing if the two measured signals are in/out of phase was needed. The resistor combiner allows a device to measure either a null or max output power depending on the inputs' destructive/constructive interference.
# What does this mean?
* Absolute phase offsets are not easily obtainable using this method
* The phase of each input can be tuned until the output reaches a minimum/maximum output, this indicates 180/0 phase difference respectively
* Due to issues with dynamic range, the null points (180 degree destructive intfer.) are easier to measure
# Why did I make it?
* This board is to prove out a relatively novel way of phase matching a large number of HackRF SDRs, for use in phased antenna arrays
* The board will hopefully prove the technique's ability to work with 4 units and from there it can be scaled up ~40/50 element arrays (each element powered by a separate radio)