diff --git a/README.md b/README.md index 6ce6ba4..37c9e14 100644 --- a/README.md +++ b/README.md @@ -2,7 +2,7 @@ ## About -Static avr-libc library providing basic support for RFM95 radio modules. +Static avr-libc library providing basic support for RFM95 (SX1276) radio modules. Other RFM9x radios might work as well, but were not tested yet. I'm impressed how well these radio modules work; the range achieved with @@ -35,21 +35,24 @@ ### LoRa -With LoRa, reception was stable with about -125 dBm at almost 7 km distance -somewhat line of sight, with the following configuration (and as well just -simple wire antennas): +With LoRa, reception was stable with an RSSI of -111 dBm and +15 dBm Tx power at +over 12 km distance line of sight, with the following configuration (and as well +just simple wire antennas): -- Output power: +17 dBm - LNA highest gain, boost on, 150% LNA current -- Signal bandwidth: 62.5 kHz +- Signal bandwidth: 41.7 kHz - Error correction code rate: 4/5 -- Spreading factor: 9 +- Spreading factor: 10 - Low Data Rate Optimization +![FieldTest5](https://github.com/user-attachments/assets/7f1d0ec2-f95d-472f-9510-919c16c1f7f6) + So, LoRa seems to perform significantly better than FSK - as expected - but FSK -probably can go further than 2.7 km under similar conditions. +certainly can go a lot further than 2.7 km under similar conditions (plain line of sight). Anyway, these radio modules work very well with both modulation schemes! -![Transmitter placement](https://github.com/user-attachments/assets/0579ce09-9a47-4a64-8224-680413c7764e) +Here's the transmitter placed at Mont-Saint-Aubert, with a nice view to Mont de L'Enclus, +were the receiver was located: +![Transmitter](https://github.com/user-attachments/assets/5ef7898a-f510-4f30-ab93-302a0ff44af7)