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Original question:

LPSTK-CC1352R: Long range communication

LPSTK-CC1352R: Long Range Mode with short range of 300m

Mario_7
Intellectual 290 points
Part Number: LPSTK-CC1352R
Other Parts Discussed in Thread: CC1352R

Hi,

This is Mario, we are using LPSTK-CC1352R for our projects and we have some issues with the communication range of the devices. Right now, we are just getting 150m range for 50kbps 2-GSFK +14 dBm and 300m range for 5kbps Simplelink Long Range +14 dBm. We are using the default projects of sensor_CC1352R1_LAUNCHXL_tirtos_ccs and collector_CC1352R1_LAUNCHXL_tirtos_ccs. We used your range estimator and we saw that the minimum range for Long Range Mode for CC13xx boards is of 1497m which is much higher than our results. For 50kbps is 784m which is also higher. We are using the default antenna and default code. Is it necessary to make any modification to reach this range? We saw that this post also reports issues with the range.

We would appreciate any advice, as this ranges are not enough for our applications.

Thank you in advance,

Mario

  • 0
    TI__Expert 4560 points

    Hi Mario

    We have been able to achieve over 1km range with the LP-STKs, I will figure out what was done to make this possible. What is the background noise where you measure with the different PHYs? What frequency are you using?

    Vegard

  • 0 in reply to Vegard H
    Intellectual 290 points

    Hi Vegard,

    Thank you for your response. We have not measured background noise yet. However, we were able to check that we reached an RSSI of -118 dBm at 300 m (very similar to the -120 dBm sensitivity reported for CC1352R with 5 kbps Long Range Mode). We are using 868 MHz frequency (Europe). If you could tell us which modifications you did to the default code to achieve this range it would be very useful.

    Thank you,

    Mario

  • 0 in reply to Mario_7
    Intellectual 290 points

    Hi,

    Do you have any updates regarding our inquiry?

    Thank you,

    Mario

  • 0 in reply to Mario_7
    TI__Guru**** 317180 points

    Could you post a screenshot of a map showing where you placed the node and collector for your range test?

  • 0 in reply to TER
    Intellectual 290 points

    Hi TER,

    Here you have it. The blue dot is the position of the collector, the white dot is the position of the sensor.

  • 0 in reply to Mario_7
    TI__Guru**** 317180 points

    How did you mount the LPSTK for this test and how far above the ground did you have it? 

    Also, did you have line of sight or did you have cars in between? From the map it looks like you used a parking lot as test space. 

  • 0 in reply to TER
    Intellectual 290 points

    Hi TER,

    We connected the LPSTK boards to two laptops, around 1m above the ground. Then, one of us started walking while carrying the sensor from the blue dot to the white dot, the other stayed at the blue dot. Yes, it was a parking lot.

    Today we tested it again at a different location, more similar to the line of sight scenario. The boards are 1m above the ground. Here you have the screenshot of the map. We have still not reached the minimum excepted range of 1497m, maybe due to the conditions of the test site, but we are closer than before.

    One question, we plan to use the sensors at certain height (around 10m above the ground) and we saw that your range estimator provides a range of 6km. Do you think that if we place the sensors at this height at the same test site of the map this would be reachable? 

    Thank you,

    Mario

  • 0 in reply to Mario_7
    TI__Guru**** 317180 points

    Looking at the map I would look into placing one board at one of the small hilltops in the wood area to the south with line of sight to where you have tested now. I would assume that the cars on your previous sight limited the range.