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Ligne 1 : − == Forewords ==+ − The RFM69 module and Packet Radio can do a lot to secure message transmission and message content (with the encryption key). − − As for wired network (aka TCP/IP) the packet radio enclose your data into datagram before sending it over the air. This helps the hardware to detect error and possibly recover when collisions occurs. − − Obviously, more we are talking on a same frequency, more we will have collision, less the communication will be efficient. − − The best solution would be to use a frequency plan where each team receives its own frequency range like showed in the following table. − − == Suggested Frequency Plan == − − − |- − | align="center" | '''Team''' − | align="center" | '''Freq (MHz)''' − | align="center" | '''Team name''' − |- style="font-size: 90%" − | align="left" | Team #1 − | align="left" | 433.1 − | align="left" | . . − |- style="font-size: 90%" − | align="left" | Team #2 − | align="left" | 433.2 − | align="left" | − |- style="font-size: 90%" − | align="left" | Team #3 − | align="left" | 433.3 − | align="left" | − |- style="font-size: 90%" − | align="left" | Team #4 − | align="left" | 433.4 − | align="left" | − |- style="font-size: 90%" − | align="left" | Team #5 − | align="left" | 433.5 − | align="left" | − |- style="font-size: 90%" − | align="left" | Team #6 − | align="left" | 433.6 − | align="left" | − |- style="font-size: 90%" − | align="left" | Team #7 − | align="left" | 433.7 − | align="left" | − |- style="font-size: 90%" − | align="left" | Team #8 − | align="left" | 433.8 − | align="left" | − |- style="font-size: 90%" − | align="left" | Team #9 − | align="left" | 433.9 − | align="left" | − |- style="font-size: 90%" − | align="left" | ... − | align="left" | 434.0 − | align="left" | ... − |} − − == Frequency plan explained == − Why do we space the frequencies of 0.1 MHz (so 100 KHz)? Spacing more (>100 KHz) will be best, spacing less (<100 KHz) is not recommended. − − The following capture coming from USA shows the spectrum view (and waterfall view) of a RFM69 emiting on the 868.0 MHz frequency. − − − − [[Fichier:ENG-CANSAT-FREQUENCY-PLAN-10.png|640px]]<small><br />Source: [https://forum.mysensors.org/topic/11501/rfm69-range-issues this thread in the mysensors.org forum]</small> − − [[Fichier:ENG-CANSAT-FREQUENCY-PLAN-11.png]]<small><br />Source: [https://forum.mysensors.org/topic/11501/rfm69-range-issues this thread in the mysensors.org forum]</small>
ENG-CANSAT-FREQUENCY-PLAN (voir la source)
Version du 20 février 2022 à 00:34
, 20 février 2022 à 00:34Contenu remplacé par « {{ENG-CANSAT-NAV}} {{COMMON-CANSAT-FREQUENCY-PLAN}} {{ENG-CANSAT-TRAILER}} »
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{{ambox|text=Note: the 868.0 Mhz is a FREE ISM band in USA. In Europe, that frequency range is reserved for LoRa transmission!}}
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