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QRO external amplifier usage

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sh123 edited this page Oct 23, 2021 · 3 revisions

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It is possible to get 30-40% TX only coverage increase in urban environment by using additional external 1-2W amplifier (about 6$ on Aliexpress), which will give 10-12 dB signal increase, achieved approximately 20 km coverage in moderate urban environment and about 15 km with almost 100% packet receiving.

  • Implement simple amplifier power switching by using relay from one of free ESP32 pinouts, use one of popular schematics from google, do NOT keep this amplifier always ON
  • Set LoRa output power to around 8 dBm cfg.LoraPwr = 8;, NB! higher than 10 dBm levels can destroy amplifier
  • Set cfg.PttEnable to true
  • Set cfg.PttPin to your relay control pin
  • Optionally change cfg.PttTxDelayMs and cfg.PttTxTailMs depending on your relay switching times
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