#Bad RSSI dBm value & connection losses

23 messages · Page 1 of 1 (latest)

lucid sand
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Hey everyone,
I am experiencing massive connection issues with a new Drone I have bought pre build. I am only able to fly in a range of a few meters before I loose the connection and the drone will failsafe.
The Bench Test also shows really bad values. I get values between -65 up to -75 dBm having the radio and the drone side by side.

What I have tried so far:

  • using the spare 90mm antenna i have on the receiver
  • updating everything
  • trying different baudrates
  • turning ADC filter off
  • trying different packet rates

My setup:

  • TX: Radiomaster TX12 mk2 (Firmware 2.8.1, ELRS Config Version 3.2.0 8d3388)
  • RX: 2.4G ELRS EP1 Nano Receiver (ELRS Config Version 3.2.0 8d3388)
  • Video: Avatar HD System
  • FC: t-motor mini f7

Any idea how I can proceed finding a solution is appreciated 🙏

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regal iris
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Can you post a photo of how you're orienting the receiver and tx antennas please

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-75dBm seems still high for a warning

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Also, can you post a photo of the Bench Test set up please.. (a photo of how the kwad and tx module is laid out during the Bench Test)

lucid sand
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here you go 🙂

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regal iris
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!antenna

merry streamBOT
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see the following images to help better orient your antennas:

regal iris
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bend your antenna following the guide above

and elevate your kwad/receiver off the flat surface..
that mug in the Bench Test guide isn't there for show

lucid sand
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This brings me up to -40 in the bench test.
Is this a value with which I can carefully try the next field test?

regal iris
lucid sand
regal iris
# lucid sand

that receiver antenna is still close to something..
and maybe that vtx antennas are kinda interfering with your signal..
but -40dBm is already good ish..

lucid sand
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yeah, both antennas are pretty close to each other in this build - but as this is a pre build set I would assume that they have tested this build.
I will go out for another test now and will come back with the results. Being on -40 in the bench test is at least way better than before. I also set the rssi dbm alarm in the goggles to -95 as it was still on standard value (which is something about -50, right?).

lucid sand
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Result of my test was:
It's much better than before but still feels bad. I had an immediate failsafe after the first time I have gone behind an obstacle with no chance to safe the drone through punching out. There is still something wrong in my system 😖

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regal iris
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you're only using 10mW

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set your power level to say 100mW or 250mW even, then keep Dynamic Power enabled

lucid sand
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Before the flight I changed the power level to 100mW (EU max). Packet rate was 150Hz

regal iris
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antenna nulls

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even your vtx/goggles crapped out