IEEE 802.15.4 subsystem
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IEEE 802.15.4 subsystem Git Source Tree
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| Source at commit c9e52c1978ed11ef9c404b381131b67703705fbb created 7 years 3 months ago. By Werner Almesberger, atusb/atusb.kicad_pcb: bring back component references | |
|---|---|
| 1 | Signal strength tests. "Local" devices are on lab bench, about 5 cm apart. |
| 2 | "Distant" device is in the adjacent room, separated by one thin brick wall |
| 3 | and 4 m of air. |
| 4 | |
| 5 | TX is requested 0 dBm (effectively -0.2 dBm). Transmission is without |
| 6 | CSMA-CA and ARQ. Results are LQI and ED (dBm). "garbled" is a bad CRC and |
| 7 | corrupted frame content. "-" is no reception. |
| 8 | |
| 9 | Distant Local |
| 10 | --------------- --------------- --------------- |
| 11 | 100813-red 100813-orange 100908-B |
| 12 | |
| 13 | TX 255, -90 255, -90 |
| 14 | TX 255, -90 garbled |
| 15 | TX 255, -90 255, -90 |
| 16 | TX 255, -90 255, -90 |
| 17 | TX 255, -90 255, -90 |
| 18 | |
| 19 | - TX garbled |
| 20 | garbled TX 255, -52 |
| 21 | 255, -89 TX 255, -52 |
| 22 | 255, -89 TX 255, -53 |
| 23 | - TX 255, -53 |
| 24 | |
| 25 | 255, -88 255, -48 TX |
| 26 | 255, -86 255, -46 TX |
| 27 | 255, -86 255, -49 TX |
| 28 | 255, -86 255, -49 TX |
| 29 | 255, -87 255, -49 TX |
| 30 | |
| 31 | 100813-red 100813-orange 100908-A |
| 32 | |
| 33 | TX 255, -90 garbled |
| 34 | TX 255, -89 180, -89 |
| 35 | TX 255, -87 196, -89 |
| 36 | TX 255, -87 148, -89 |
| 37 | TX 255, -87 - |
| 38 | |
| 39 | 255, -86 TX garbled |
| 40 | 255, -87 TX 255, -49 |
| 41 | 255, -86 TX 255, -49 |
| 42 | 255, -87 TX 255, -49 |
| 43 | 255, -86 TX 255, -49 |
| 44 | |
| 45 | - garbled (-44) TX |
| 46 | - - TX |
| 47 | - - TX |
| 48 | - - TX |
| 49 | - - TX |
| 50 | |
| 51 | 100813-red 100813-orange 100908-A (reworked) |
| 52 | |
| 53 | TX 255, -87 255, -87 |
| 54 | TX 255, -87 255, -88 |
| 55 | TX 255, -87 255, -87 |
| 56 | TX 255, -87 255, -88 |
| 57 | TX 255, -87 255, -88 |
| 58 | |
| 59 | 255, -86 TX 255, -56 |
| 60 | 255, -86 TX 255, -57 |
| 61 | 255, -86 TX 255, -58 |
| 62 | 255, -86 TX 255, -58 |
| 63 | 255, -86 TX 255, -58 |
| 64 | |
| 65 | 255, -85 255, -52 TX |
| 66 | 255, -85 255, -52 TX |
| 67 | 255, -85 255, -52 TX |
| 68 | 255, -86 255, -52 TX |
| 69 | 255, -86 255, -52 TX |
| 70 | |
| 71 | |
| 72 | Conclusions |
| 73 | ----------- |
| 74 | |
| 75 | - 20100813 (atusb) and 20100908 (atusd) board show similar performance when |
| 76 | at least one station is an atusb |
| 77 | |
| 78 | - resistive divider doesn't work |
| 79 | |
| 80 | - no clear indication of whether capacitative divider causes interferences. |
| 81 | Marked difference in one series of tests but the others look the same. |
| 82 | |
| 83 | - reception level is about 4 dB above workable minimum. (Specified receiver |
| 84 | sensitivity is -101 dBm, but things start to deteriorate around -90 dBm.) |
| 85 | We have a reserve of 3.2 dB for transmission (used -0.2 dBm, maximum is |
| 86 | +3.0 dBm). |
| 87 | |
