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ttgo lora esp32 has so bad rssi values when they are so close why? #336
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With short and Chinese antenna, normally I only get around -50 to -40 RSSI within 20cm. So it is normal in my viewpoint. |
I’ve never seen better than -50 or so at 2-3 feet distance, even with hand-tuned antennas that will transmit over 2 miles at ground level. So, I wouldn’t worry about trying to get much better than you currently have. |
Really? |
Can you post a link to that Antenna? Also, at close distances, you are within the Fresnel Zone, and tiny movements will have a big affect on performance, as will any object nearby. IMHO, the best way to determine antenna performance is in the field - no obstructions and at least 100m of distance between transmitter and receiver. |
You check the second post in this topic for the handmade antenna. People said need to measure in at least several meters away. Im just not happy enough for not reaching something better than -40 dBm RSSI. May be the dipole or tripole antenna may help? Your antenna is single wire antenna, right? |
I made a 1/4 wave dipole antenna - two wires at 180° from each other. The antenna in post #2, is not optimal. It is a monopole, but has little to no ground plane. You can increase its efficiency greatly by adding an equal-length wire to the ground connection on the LoRa module, at 180° to the antenna wire. |
Then I believe your test result is reliable. Just wonder how others get under -40dBm RSSI. May be due to PA or RFO? Or other aspects? |
I use a 17+cm bronze wire as single wire antenna. One of my friends use the below antenna . May be in short range, a good antenna can not give better RSSI number below -40dbm. From RSSI and SNR, how to reliable test the quality of the signal? |
i have sx1276 ttgo lora, when they close it should be like - 8 or even -15 rssi right?
when i get close i got like rssi -40 or -50 rssi value, is that normal?
i use everything for make it boost like
LoRa.setTxPower(20, PA_OUTPUT_PA_BOOST_PIN );
LoRa.setSpreadingFactor(10);
anybody can handle it?
i got stock antenna and device working at around 840- 868 mhz
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