When using polarized antennas (they all are) it's important to perform measurements when polarization planes of both antennas match exactly.
If using 2 chains on one side and both antennas are at some angle (ideally at 90° angle), then they'll both contribute to reception even if the other party only uses one chain (and antenna). This will to large degree elimitate the issue of polarization plane misalignment.
If both link partners are using single chain / antenna, misalignment causes big problems (which can explain the large signal level drop in your second table). So when doing these tests, make your best to align polarization planes ... either by turning phone to find position with best signal levels or by aligning AP antenna (if it's adjustable). It shouldn't matter which end you're using to display signal level, antenna polarization is the same for both Tx and Rx.
Measurements also depend on environment (e.g. amount of reflections off room walls, which can either improve or degrade signal levels) and the receiver's DSP performance. There's a reason for using testing chambers wgen measuring antenna performance, they are engineered to absorb stray RF energy rather than reflect it.
If using 2 chains on one side and both antennas are at some angle (ideally at 90° angle), then they'll both contribute to reception even if the other party only uses one chain (and antenna). This will to large degree elimitate the issue of polarization plane misalignment.
If both link partners are using single chain / antenna, misalignment causes big problems (which can explain the large signal level drop in your second table). So when doing these tests, make your best to align polarization planes ... either by turning phone to find position with best signal levels or by aligning AP antenna (if it's adjustable). It shouldn't matter which end you're using to display signal level, antenna polarization is the same for both Tx and Rx.
Measurements also depend on environment (e.g. amount of reflections off room walls, which can either improve or degrade signal levels) and the receiver's DSP performance. There's a reason for using testing chambers wgen measuring antenna performance, they are engineered to absorb stray RF energy rather than reflect it.
Statistics: Posted by mkx — Sun Mar 31, 2024 11:19 am