Measured Performance of the Long Range PHYs#
Conducted Testing#
The following table presents the following measurement results collected on real silicon with the PHYs available in the LR Profile:
Receiver sensitivity corresponding to 1% packet error rate (PER)
Overall required link (Rx+Tx) XO accuracy requirement calculated from frequency offset tolerances
Frequency Band[MHz] | Data Rate[kbps] | Measured Sensitivity[dBm] | (TX + RX) XO Accuracy[ppm +/-] |
|---|---|---|---|
434/490 | 1.2 | -128 | 2.5 |
434/490 | 2.4 | -124.5 | 5 |
434/490 | 4.8 | -122.5 | 10 |
434/490 | 9.6 | -120.5 | 20 |
434/490 | 19.2 | -117 | 40 |
868/915 | 1.2 | -128 | 1.25 |
868/915 | 4.8 | -120.5 | 5 |
868/915 | 9.6 | -118 | 10 |
868/915 | 19.2 | -115 | 20 |
868/915 | 38.4 | -112 | 40 |
868/915 | 80 | -107.5 | 80 |
Full characterization is ongoing but based on the available results, CW blocking at 2 MHz / 10 MHz - with wanted signal at +3 dB above sensitivity - is expected to be -51 / -36 dBm, respectively, for the high bands and -53 / -37 dBm for the low bands.
Packet error rate waterfall and frequency offset tolerance curves are provided in the following two figures for the 4.8 and 19.2 kbps PHYs in the 434 and 915 MHz bands.
In the figure above, signal is 3 dB above sensitivity level. TCXO – generator residual frequency offset was not compensated here.