• State Verified Answer
  • Replies 17 replies
  • Subscribers 66 subscribers
  • Views 2799 views
  • Users 0 members are here
Attachments (0)
Nordic Case Info
  • Case ID: 270475
Options
This post is older than 2 years and might not be relevant anymore
More Info: Consider searching for newer posts

regarding the distance for the bluetooth range for scan and advertisement for nrf52840

liuluan1984

Hi Nordic,

I am using the two nrf52840 units to test adv and scanning in a pair for the development. I am using BLE_GAP_PHY_CODED for both scan and advertisement. But when I test it, seems the package lost get very high when distance is longer than 70 meters. Any way to improve it? Also, is it possible to use the antenna signal amplifer for improve the receiving and advertisement distance?

Parents
  • 0

    Do you know the specific load capacitance of the crystal you're using? According to the Epson Q13FC1350000200 datasheet CL can be 7, 9 or 12.5pF, and it it's the latter, you might wanna consider larger capacitors (20pF), as we generally go by this formula where Ccap is the best capacitor value for a crystal: Ccap = CL * 2 - 4pF. Although it seems strange that this would affect the range of your application. Do you have an nRf52840 DK available to test on, to see if you get the same range out of a DK as the modules? 

    Do you see any disconnect reason when the devices disconnect at the maximum range (280 meters)? Are you seeing the expected timeout or some other error? Also, what RSSI values are you seeing at the higher ranges?

    Best regards,

    Simon

Reply
  • 0

    Do you know the specific load capacitance of the crystal you're using? According to the Epson Q13FC1350000200 datasheet CL can be 7, 9 or 12.5pF, and it it's the latter, you might wanna consider larger capacitors (20pF), as we generally go by this formula where Ccap is the best capacitor value for a crystal: Ccap = CL * 2 - 4pF. Although it seems strange that this would affect the range of your application. Do you have an nRf52840 DK available to test on, to see if you get the same range out of a DK as the modules? 

    Do you see any disconnect reason when the devices disconnect at the maximum range (280 meters)? Are you seeing the expected timeout or some other error? Also, what RSSI values are you seeing at the higher ranges?

    Best regards,

    Simon

Children
No Data
Related