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Want to ask about spectrum distribution of radio waves specifically for LoRa application

embeddedguy

Hi Everyone,

I have a Dragino LoRa module HaT which is compatible with RaspberryPi version 3 and older. I wanted to create a LoRa gateway(single channel) for personal use and evaluation how things work.

I saw that the HaT is compatible with frequencies as follows...

868 MHZ/433 MHZ/915 MHZ(Pre-configure in factory)

https://www.dragino.com/products/lora/item/106-lora-gps-hat.html

The region I am living right now(India) does not have 868MhZ as license free band and also not other two remaining frequencies supported by this shield. However here frequencies from 865 to 867MhZ are license free.

These has created confusion to me weather I could use this shield for my application. Some internet discussion also suggest that the module can be configured to 687 MhZ to be used.

Other suggest even that the 868 MhZ can also be used license free as channels are overlapping with 867 MhZ frequency. This has created confusion to me. It would be helpful to ask and get some insight how these frequency division works.?

On internet there are only a few key information but not details about how it distributed.

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  • TL:DR;

    The software or firmware in the gateway handles the frequency channels to use with variations per location/Country. For example, there could be a fw version for 868 MHZ where all the band is free or a version for 868_india. As yours is a single-channel gateway, you can work in the 865-867 range.

    More Details:

    As   mentioned, the designation "868" or "915" includes some Mhz around that central frecuency. These are proposed as license-free band, however some countries already use those bands full or in part. That's why a combination of channels and bandwidths within the band can be used for LoRaWAN, but that will be very specific to the country radio regulations. I have seen gateway Fw versions like 915_AU, 915_SG, 915_CO for Australia, Singapore and Colombia, respectively. This for multichannel gateways, though.

  • in reply to gustavovelascoh

    Yes that's precise information you have mentioned.

    So for this module there is a document which mentions how to set a frequence but it does not cover the detail which frequency will work/not work...

    So, I can do two things. First ask Dragino weather frequency in range of 865-867MhZ is possible to set and then if not ask local regulatory body for guidance.

    The document also mentions how to connect to the TTN.

    image

    www.dragino.com/.../LoRa_GPS_HAT_UserManual_v1.0.pdf

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