Part Number: LAUNCHXL-CC1352P
I'm using 2 launchpads, a launchxl-cc1352p1 and a launchxl-cc1352r1 to test the LOS range at 868MHz. Setup is as follows:-
- both set to 868MHz, 50kbps, 2-GFSK, 25kHz deviation, RX filter BW 98kHz
- launchxl-cc1352p1 is running the rfPacketTX firmware, and TX power is set to 20dBm
- launchxl-cc1352r1 is attached to laptop running Smartrf Studio7 in RX mode
What I'm finding is that LOS range is approx 70m. I was expecting a much higher range given that papers I've read say that subGHz is meant to have a range >1km. Are my settings wrong?
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In reply to TER:
Some details on what I'm doing...LPs are held at a height of approx 1.5meters, with one taped to a plastic pipe and the other taped to a cardboard box. The LP pcbs are positioned in the vertical plane with the PCB antenna at the top. The LP-cc1352p1 is transmitting and is in a fixed position on a street. And I walk down the street with LOS, holding the LP-cc1352r1 (receiving).
The results in my previous post were at 868MHz and running the smartRF continuous RX indicated the upper limit of the noise floor to be about -70dBm. I was only getting a distance of around 60-70meters.
I had a look at 915MHz, and running the smartRF continuous RX indicated the upper limit of the noise floor to be about -90dBm. I was able to get to about 130 meters LOS with a PER of <10%. This time, I used Smartrf studio at both ends to do this test at 915MHz, with the same settings as in the previous post, except for the 915MHz freq of course.
In reply to tc:
The noise floor you are measuring is very high and the range is really poor. 70 -130 m is a clear indicator that something is wrong here.
Do you have a 4G phone / strong interference working in close proximity of the Rx unit ?
Are you positioning/holding the LPs so the antennas are detuned ?
Best radiation / range from the boards is when the LPs are facing each other so the effective antenna area size is as large as possible. If the edge of the boards are facing each other, then this will give a lower range but still should be way better than 70 - 130 m at 868/915 MHz.
Make sure that you are using the latest version of the SmartRF studio so the xtal tuning is correct for the LPs.
Do you have access to a SA ?
If yes, then ideal to measure the output power and the frequency offset on the LPs.
Measure the NF in a 100 kHz bandwidth with the SA.
In reply to RGW:
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