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ExpressLRS / ExpressLRS

STM32/ESP32/ESP8285-based High-Performance Radio Link for RC applications
GNU General Public License v3.0
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flywoo EL24E and betafpv 2.4rx target has bad rssi dbm #1186

Closed wang322588 closed 2 years ago

wang322588 commented 2 years ago

Current Behavior

I flashed the new target " flywoo EL24E rx "for my Firefly 1S Nano Baby Quad . When checking the signal health it has bad rssi dbm value.And the remote distance is short.

The rssi dbm is about -50 ~ -60 when the Tx and Rx between 1m far. Tx power is 10mw. I touch the rx with tx and value is still -35. This is unnormal because flash the 1.2.0 version (DIY-2400-ESP8285-SX1280) works fine ,the dbm is -35. nearly -19 while touching. 2.0.0 add new target for flywoo ,I flash both DIY and FLYWOO but the issue remains.

Steps to Reproduce

flash flywoo EL24E rx jumper t-lite flash DIY 2.4 lora 1280f27 set tx power 10mw dynamic power is off connet and check the dbm value

Possible Solution (Not obligatory)

I think the new rx firmware maybe the problem. Tx works fine while connecting other rx.

Details

Your Environment

SunjunKim commented 2 years ago

I think the new rx firmware maybe the problem. Tx works fine while connecting other rx.

What are the "other rx"? Could you elaborate, please?

wang322588 commented 2 years ago

I tested betafpv 2.4G lite receivers seems to be the same problem. Nano receiver is good. I think it is not the software issue.Receivers wtih ceramic antenna may have low rssi dbm in 2.0.0.So close it.

edernucci commented 2 years ago

@wang322588 I have a suspect here and I need your help testing it. Can you please change your module firmware to version 1.2.1 and test again? I'm afraid it's a problem similar to the one we had with BetaFPV's TX.

wang322588 commented 2 years ago

@edernucci I tested the version 1.2.1.Works fine.So I reopen it I think the 2.0.1 firmware also have this issue.

edernucci commented 2 years ago

@wang322588 I'm confused. What is your TX? Is a 2.4 DIY?

wang322588 commented 2 years ago

@edernucci Yes.A DIY ESP32 and SX1280lora .After I fly them outsider I think the actual connection effect is normal,rc distance is similar compare to 1.2.*. only the DBM value becomes lower in OSD.Most of people may not notice this issue however it could affect the dynamic power.

wang322588 commented 2 years ago

On receivers using an SMD antennas, expect lower values than those equipped with wire antennas. If the receiver with the SMD antenna has heat shrink, enclosed in a whoop canopy, surrounded with carbon parts or buried inside a plane/fixed wing, expect some more attenuation of the signal.quote by elrs webinfo