Other Parts Discussed in Thread: CC1310, CC1190,
Dear support team,
We are developing new project for outdoor vehicle telemetry system in tracks. We are using CC1310 at 868MHz for Europe and 915MHz for US. For this project we need external amplifier for both transmission (PA) and reception (LNA). We bought several pcs LAUNCHXL-CC1310 and LAUNCHXL-CC1390 (CC1310 + CC1190 PA/LNA). The performance of LAUNCHXL-CC1390 is OK for our need. Unfortunately we cannot deliver CC1190 for production any time soon, and we were forced to use another manufacturer for the amplifier (we use SKY66420).
For the comparison, we combined LAUNCHXL-CC1310 and SKY66420 demo boards, but have receive issues. Is it possible to describe the connections and setup we use (at the end the amplifier is not TI part), in order to advice us if we use wrong adjustments.
Our problem is:
When in receive mode, the setup, including the LNA works much worse, than the setup with only CC1310 and passive antenna, some additional information:
- In short distance from the transmitter, the LNA setup provides ~10dBm better RSSI, than the standalone CC1310 test board
- After specific distance (~120m from the transmitter), the LNA setup starts much more CRC errors and packet loss, than the CC1310 standalone board (it barely receives 1% of the packets), but the OK received packets again shows better RSSI, than the standalone board. In standalone mode, the typical performance on the same distance is ~60% loss, which is much better.
We double checked the external LNA configuration (proper pin levels for receive mode), the CC1310 board is working perfect when in standalone mode)
We checked the external LNA RX parameters, it should provide 16dB LNA gain and typical added noise of 1.5dB.
We tested with receiving with LAUNCHXL-CC1390 and it works brilliant (~25% losses, which is totally perfect for our case)
Do you think the LNA gain is too much for CC1310 input, or we should have setup error in connection on the boards in general
If needed, we can provide the exact connection approach, and setup details in order to solve this.
Thanks in advance