[HH] Semtech long range device using 2.4 GHz

[Stephen Ronan]

"BLE in particular appears to do most of what the 2.4GHz LoRa fans would like."

But a single ultra-lower power radio+antenna that can both communicate
at 2Mbps with a bunch of BLE devices within a few hundred feet and
intersperse that with occasional communications at 70 kbps to a
mile-away gateway does have some appeal, doesn't it?

On Mon, Mar 20, 2017 at 8:46 AM, Kurt Keville <klk at mit.edu> wrote:
> I think Semtech might be confusing the cash cow and the loss leader in
> TTN logistical support. We don't need LoRa on 2.4 GHz but it would be
> nice if we had (really slow) Wireless Internet options on 900 MHz. I
> don't anticipate ever buying another 2.4GHz radio, seeing as you get
> them for free on seemingly every board you buy these days. BLE in
> particular appears to do most of what the 2.4GHz LoRa fans would like.
>
> The low bandwidths on LoRa are a feature, not a fault. It makes us use
> the network only for the appropriate functionalites.
>
> On Sun, Mar 19, 2017 at 10:24 PM, Stephen Ronan <sronan at gmail.com> wrote:
>> Those Semtech 2.4 Ghz boards support LoRa, FLRC, and (G)FSK
>> modulation. Someone who knows far more than I do about these matters
>> explains that the 2 Mbps data rate I had cited is via the FSK
>> modulation. While for LoRa the data rate depends on the spreading
>> factor (SF) about which more here:
>> https://www.thethingsnetwork.org/forum/t/how-spreading-factor-influence-time-on-air/5068
>> Specifically, in respect to data rates he wrote:
>>
>> "for LoRa 2.4Ghz it's
>>
>> SF 5: 202 kb/s
>> SF 6: 122 kb/s
>> SF 7: 71 kb/s
>> SF 12: 0.476 kb/s"
>>
>> On Sun, Mar 19, 2017 at 5:26 PM, Stephen Ronan <sronan at gmail.com> wrote:
>>> I don't know what to make of this... a new product from Semtech (which
>>> owns the core LoRaWAN patent) that uses 2.4GHz spectrum... and
>>> advertises a "sensitivity, down to -132 dBm". The last of the links
>>> below says:  "The new 2.4 GHz wireless RF solution enables
>>> point-to-point wireless links that can support custom protocols with
>>> configurable data rates up to 2 Mbps". By contrast, my understanding
>>> is that their LoRaWAN products max out at something like 20 kbps.
>>>
>>> https://www.thethingsnetwork.org/forum/t/2-4-ghz-lora/6045
>>> http://www.semtech.com/apps/product.php?pn=sx1280,
>>> https://www.semtech.com/wireless-rf/24ghz-wireless-rf-solution
>>>
>>>  - Stephen
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