Part Number: CC1120-CC1190EM915RD
I have the CC1120DK Dev kit from digikey. Where do I get the CC1120+CC1190 combo?
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Part Number: CC1120-CC1190EM915RD
I have the CC1120DK Dev kit from digikey. Where do I get the CC1120+CC1190 combo?
Is an evaluation board available using a CC1120/1125/1310/etc with a front-end LNA/PA at 400MHz and 27dBm+?
Thanks
An initial test of the CC1120 420MHz to 470MHz with:
showed a signal strength of -11dBm with the transceivers next to each other on the bench.
2 questions.
I am working toward a head-to-head comparison of a TI narrow band solution and LoRa and want the test to be as fair as possible.
Thanks
That's what I'm thinking. At a bandwidth of 12.5kHz, I could get 25kbps with 4-FSK, but that bandwidth is hardly ultra narrowband. Such a wide bandwith with 4-FSK, even with a transmit power of 27dBm out of the antenna (under part 90), an FSK system just doesn't appear to have the link budget compared to LoRa.
Which puts LoRa in the better position for a building-wide radio network that can provide an average of, say, 250bps to each of 100 radios, with a peak of 1kbps, and a link budget in excess of 145dB.
Its looking like that isn't possible with FSK.
[Again, bear in mind I am still in research mode here...]
I get that, to a certain extent, there is a diminishing return to using any spread-spectrum technology, especially one like LoRa that uses a continuous swath of bandwidth at a low data rate. If the technology is adopted widely it will begin to be less effective.
My problem is that right now it is a great solution to a difficult problem- I need a long range (as in multi-floor, building-wide) intra-building communication solution with maybe 100 nodes in a star topology at a data rate on the order of 1000bps for each node. LoRa appears to be the only technology with the numbers.
Ultra narrow band *could* work but it isn't there yet, that I can see, for one main reason- It's long range capabilities are hobbled by its attendant low data rate. (Even at that, does ultra narrow band compete with LoRa at similar low data rates?)
In a star configuration, using ultra narrow band means by definition it is a multi-access technology, and therefor the available bandwidth is divided by the number of nodes. Worse, in any busy multi-access network collisions will also take a further toll on throughput. A general rule of thumb is a 50% toll.
If ultra narrow band can compete with LoRa on range, then what would help is a TI solution where a gateway chip could scan a number of narrow band channels for activity, then either stop on that frequency to receive, or task another receiver to handle receiving the data. This would require a longer preamble for the gateway receiver to prepare, but a small price to pay for much longer range.
In fact, like LoRaWAN, it would help to have a network layer to handle adjusting transmission speed and transmit power so that nodes nearer the gateway use a wider bandwidth and reduced power while the most distant nodes run narrow band at high power, while at the same time working out the multiple access/collision avoidance problems (such as with time slots).
The bottom line for me is this- early in my research I saw (like most do) that LoRa has an Achilles heel that will most certainly bring it down- its own success. You can't take up large swaths of bandwidth without there being some sort of problem later. The dilemma is, will LoRa congestion ever actually become a problem? Maybe yes, maybe no. In the mean time do I risk being beaten by the competition who will use LoRa?
TI is a major player in the IOT market where bandwidth + range is king. All the research I've read points to the fact that inside buildings, 400MHz will always beat 900MHz for wall attenuation. Yet I can't get my hands on a 27dBm 400MHz demo. TI even has a 100km solution that I can't evaluate because it isn't available.
I would love to get my hands on a narrow-band solution that can compete with LoRa. But it doesn't appear to exist.
Question- LoRa trades bandwidth for range. Is there a modulation scheme that trades time for range? That works even below the noise floor?