Modifications

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.

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.

The following capture coming from USA shows the spectrum view (and waterfall view) of a RFM69 emiting on the 868.0 MHz frequency. Just remember that

{{ambox|text=Note: the 868.0 Mhz is a FREE ISM band in USA. In Europe, that frequency range is reserved for LoRa transmission!}}

{{ambox|text=Note: the 868.0 Mhz is a FREE ISM band in USA. In Europe, that frequency range is reserved for LoRa transmission!}}

As you can see, the transmission does take place on the right and left side around the central 868.0 MHz axis. A bit like a mirroring image. This is called "Double Side Band" (DSB) communication in the radio area with the carrier wavelength set to 868.0 Mhz.  

As you can see, the transmission does take place on the right and left side around the central 868.0 MHz axis. A bit like a mirroring image. This is called "Double Side Band" (DSB) communication in the radio area with the carrier wavelength set to 868.0 Mhz.  

{{ambox|text=The carrier wavelength doesn't ship any data/information (no peak in that position) since the "Double Side Bands" are enough to rebuild the transmited information}}

{{ambox|text=The carrier wavelength doesn't ship any data/information (no peak in that position) since the "Double Side Bands" are enough to rebuild the transmited information.}}

   

   

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