is it possible that when you set to 100% power there is nothing inline with the DUT and wen you introdce a slight attenuation you are placing extra programmable attenator circuitry that might introduce a distortion... this may be in instrument artifact... just thinking out loud
@MAX-NICHOLE: There should be a correlation of investigation how both methods behaves better, so industry do not aist their capitals! I know they will not be the smae due to the nature of signal path, and space simulation.
I'm thinking that the differences between anechoic and reverberation chambers are somehow linked to multipath propagation. If there is a different approach in terms of performances in anechoic chambers and reverberation chambers (some radios are good in one and bad in the other) the base station will be able to see if there is a multipath fading (or delayed copies), therefore will it not be able to signal the device to change its radio (or some parameters.. in the end is a SDR)? (another idea why some are good in reverberation is possible because they are aware of some resonance effect... I don't know)
ive been using r&s cmw500 to measure lte sensitivity and always see a sharp decline from 100% to < 95% in throughput (usually within a change of <1 dB in dl power). do you know, theoretically, why this happens? i think this also happens using anritsu call boxes...
when you update teh slices can you place a label such your answer: The horzontal axis is the power measred in the test zone. .... MEASURE POWER FROM THE MIMO. AND yes!!! if small power is detectable, the Phones are better ...with better sensitivity
AS I UNDERSTAND THESE PLOTS IS BACKWARDS: MORE NEGATIVE MEANS MORE LOST OF SIGNAL MEASURED AT THE ANTENNA, SO -92dB is better than - 103dB but here is backwards ...so i was questioning the meaning of the plotting.
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Q: Fanny, do you know of a good source or sources of information about health risks (e.g., brain tumour) associated with cellular phone usage (in particular, phone against skull, cf. "the sphere around the DUT") ?
David Servan-Schreiber, M.D., PhD (neurology) discusses this topic in the DVD production of his book "Anticancer", and mentions, if I recall correctly, that while few long-term studies exist to date the danger is certainly real.
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