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87 lines
2.0 KiB
Plaintext
87 lines
2.0 KiB
Plaintext
Signal strength tests. "Local" devices are on lab bench, about 5 cm apart.
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"Distant" device is in the adjacent room, separated by one thin brick wall
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and 4 m of air.
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TX is requested 0 dBm (effectively -0.2 dBm). Transmission is without
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CSMA-CA and ARQ. Results are LQI and ED (dBm). "garbled" is a bad CRC and
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corrupted frame content. "-" is no reception.
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Distant Local
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--------------- --------------- ---------------
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100813-red 100813-orange 100908-B
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TX 255, -90 255, -90
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TX 255, -90 garbled
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TX 255, -90 255, -90
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TX 255, -90 255, -90
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TX 255, -90 255, -90
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- TX garbled
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garbled TX 255, -52
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255, -89 TX 255, -52
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255, -89 TX 255, -53
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- TX 255, -53
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255, -88 255, -48 TX
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255, -86 255, -46 TX
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255, -86 255, -49 TX
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255, -86 255, -49 TX
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255, -87 255, -49 TX
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100813-red 100813-orange 100908-A
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TX 255, -90 garbled
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TX 255, -89 180, -89
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TX 255, -87 196, -89
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TX 255, -87 148, -89
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TX 255, -87 -
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255, -86 TX garbled
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255, -87 TX 255, -49
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255, -86 TX 255, -49
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255, -87 TX 255, -49
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255, -86 TX 255, -49
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- garbled (-44) TX
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- - TX
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- - TX
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- - TX
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- - TX
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100813-red 100813-orange 100908-A (reworked)
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TX 255, -87 255, -87
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TX 255, -87 255, -88
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TX 255, -87 255, -87
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TX 255, -87 255, -88
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TX 255, -87 255, -88
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255, -86 TX 255, -56
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255, -86 TX 255, -57
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255, -86 TX 255, -58
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255, -86 TX 255, -58
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255, -86 TX 255, -58
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255, -85 255, -52 TX
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255, -85 255, -52 TX
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255, -85 255, -52 TX
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255, -86 255, -52 TX
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255, -86 255, -52 TX
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Conclusions
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-----------
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- 20100813 (atusb) and 20100908 (atusd) board show similar performance when
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at least one station is an atusb
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- resistive divider doesn't work
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- no clear indication of whether capacitative divider causes interferences.
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Marked difference in one series of tests but the others look the same.
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- reception level is about 4 dB above workable minimum. (Specified receiver
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sensitivity is -101 dBm, but things start to deteriorate around -90 dBm.)
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We have a reserve of 3.2 dB for transmission (used -0.2 dBm, maximum is
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+3.0 dBm).
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