• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 53 subscribers
  • Views 488 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

LAUNCHXL-CC13-90: Poor range using PCB antenna and built-in demo when CC1190 is disabled

LAUNCHXL-CC13-90: Poor range using external antenna and built-in demo

Philip Rittenhouse
Prodigy 50 points
Part Number: LAUNCHXL-CC13-90
Other Parts Discussed in Thread: CC1350

We are testing the LR mode of the demo using external whip antennas (using SMA connector) at 915MHz.  Our range results are not significantly better than what we see with the CC1350 launchpads using the same antennas and long range settings.  I would have expected much better results given the higher output power - has anyone else done a similar comparison?  

We followed the recommended modifications to remove A2 and mount a 0 ohm resistor for R158 but I noticed that this leaves the connection to the SMA's ground plane (A1?) unpopulated.  Should there be a cap there?

  • 0
    TI__Guru**** 317180 points
    Not sure what you are referring to as SMA ground plane. A1, A2, A3 are components used to match the antenna. These components have no purpose when using the SMA connector. A2 has to be removed not to introduce an extra impedance. A1 should not be mounted. I assume you have the US version of the LP.

    Range tests are difficult to comment on since I don't know how you have done the test. To check that the LPs works as expected you can set the CC1350 LPs with 10 m LOS and read the RSSI of the received packets. Do the same tests with the CC13-90 LPs and compare the RSSI.