Wednesday, December 9, 2020

 LoRa APRS on 70 cm - part 1: Informations









The LoRa® modulation is a spread-spectrum technique that uses wideband linear frequency modulated pulses to encode information, whose frequency increases or decreases over a certain amount of time.
As with other spread-spectrum modulation techniques, LoRa® uses the entire channel bandwidth to broadcast a signal, making it robust to channel noise. In addition, because LoRa® modulation uses a broad band of the spectrum, it is also resistant to long term relative frequency error, multi-path fading and Doppler effects.


LoRa ARPS on spectrum with 433 MHz wireless sensors in the city

Some useful websides:



LoRa APRS Gateway on Raspberry PI

- You can run also 2m APRS (RTL-SDR)
- Web based SDR (RTL-SDR)


LoRa APRS Gateway on TTGO board

- Smaller power consumption compare to raspberry PI
- Cheaper



My instalations:

OK2ZAW-1 & OK2ZAW-5

- Raspberry PI with LoRa APRS, RTL-SDR for 2m APRS and RTL-SDR for OpenWeb RX
- Wideband LNA + FM notch filter + 3-way CATV splitter. Lora has 433MHz BPF.
- Antenna is dualband X-30


Coverage OK2ZAW-1 December 2020

OK2ZAW-2 & OK2ZAW-4 Cottage

- Raspberry PI with LoRa APRS and RTL-SDR for 2m APRS.
- Wideband LNA  + 2-way CATV splitter. Lora has 433MHz BPF.
- Antenna is dualband X-30



Coverage OK2ZAW-2 December 2020

OK2ZAW-17 LoRa Digipeater in Eagle Mountains

- Unter first testing - missing MPPT solar charger
- TTGO Lora32
- 4 Ah / 12 V Pb aku + 10 W solar panel - 0,035 A @ 13 V
- QTH: Koruna JO80fg 1100m asl, antenna 2m above gnd
- Antenna is dualband X-30



OK2ZAW-15 solar powered WX station in Eagle Mountains


LoRa APRS coverage of all GW in OK (Dec. 2020)

ALL iGates in OK - link here



Part 2: TTGO Lora32 as iGate or Digipeater

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