Getting RSSI in PPM/SBUS Channel with Taranis

by Oscar

You can send RSSI via a spare channel in PPM or SBUS, and display it on your OSD (Betaflight OSD and MinimOSD). This trick applies to any Frsky receivers with telemetry, including the R-XSR, XSR, X4R-SB and the D4R-II.

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However one since the RSSI signal is PWM, a digital form, you need a low pass filter to convert it into analogue voltage level. I didn’t use one and just connect them directly, it works, but the RSSI data is pretty inaccurate I must say. It changes very infrequently, and basically only jumps between 0 and 100.

Also RSSI pads on the receiver often tend to be very small and difficult to solder to.

Apart from getting this info from the telemetry port, I also recently found another way of getting RSSI value, which is more accurate, and no additional wire and soldering. If you are running PPM, and has a spare channel, you can assign this channel RSSI and send it back to your RX. Then you can configure your Cleanflight to recognise this channel as RSSI value. Finally you can setup the MinimOSD to get RSSI reading from Cleanflight, and display it.

The setup is the same for both Taranis X9D and QX7.

Configuration on Taranis – RSSI value in PPM Channel

First of all set up a input in Taranis.


I call it “rssi”, and choose “RSSI” as the source. Leaving all other settings as default. Setting Scale to 100.


In Mixer, we choose a spare channel, in my case I chose Channel 7.

If you are not sure and don’t want to upgrade firmware, just use 6 or fewer channels in PPM.


I name it “rssi”, and I chose the input we just created which was also called “rssi” (it has an highlighted “i” icon before the name).

Note that a channel output should have range between -100 to 100. With default weight of 100 and offset 0, the RSSI  channel output will only be 0 to 100. Therefore I have made Weight 200 with offset -100.


We can now check the RSSI channel output. This is when the receiver is switched off, and RSSI iis 0% (output is -100)


And now if I turn on the receiver, we are getting a pretty strong signal.


Important Note! (12/07/2015) With Frsky D4R-II receiver, make sure you have the latest firmware installed to use more than 6 channel PPM. Basically with the old firmware, where the signal width was 18ms, it caused problems when you use more than 6 channel in CPPM. The new firmware resolved the issue by using 27ms signal width. Some shops sell the RX with new firmware, check with them first.

Configuration in Betaflight

We need to tell Betaflight/Cleanflight, that we are passing RSSI via a PPM or SBUS Channel.

In the Receiver tab, and choose the AUX channel you are using for RSSI. If you are using channel 8, then this will be AUX 4.

Once you have saved it and restarted the FC, and you should see the RSSI in the Setup page.


You can confirm this in the Receiver tab as well which is showing RSSI in PWM signal (1000-2000).


Displaying RSSI on Betaflight OSD

Basically you just need to enable “RSSI” in the OSD tab. Simple as that. Learn about setting up Betaflight OSD in this tutorial.

Warning: make sure failsafe for the RSSI channel in the failsafe tab in Betaflight is set to “set” to a value that indicates a signal lost (say 1000 which is equivalent to 0%). If you leave it on “hold” the RSSI value on OSD is going to get stuck on the last value before the failsafe. It might not even reset when you get your signal back.

Displaying RSSI on MinimOSD

If you are using MinimOSD with MWOSD firmware, you need to enable option “Use FC RSSI”. Also RSSI Max has to be changed to 255, and Min to 0.

NOTE (16/Apr/2016): From MWOSD 1.6, the Max RSSI has been changed to 1023, no longer 255.


Important Note (Aug 2017): If you lose signal, your RSSI might get stuck at the last available value and does not change. You can lose RF link completely but still getting good RSSI value on your OSD. Here is how to avoid this problem:

Check on the receiver tab which AUX # your RSSI signal is.

After that go to the failsafe tab. All AUX channels are by default set to HOLD, they will just keep the last value when you switch off the radio. Set the correct AUX channel in failsafe to SET 1000 and save.

After this is done the RSSI will show 0% if your radio is off or when the link is lost.

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Soosaneen 19th September 2022 - 8:46 am

Hi Oscar. Can you do wiring diagram for xm+ rssi solder pad to hobbyking e-osd bat2?

Matthew Carlisle 23rd September 2020 - 8:01 pm

This is SO awesome and finally solved my problem of displaying my RSSI from my F4 boards on my OSD. Before this I was purely reliant on my Taranis voice callouts if my signal got low and a visual representation is much more useful (although both have their place).

A quick tip: on my Mamba F405 MK2 and iFlight SucceX-E F4 flight controllers, the correct RSSI percentage would not show up for the first time on the Betaflight Setup tab until I unplugged the quad from the the battery and USB. This was only the case right after initial setup. After this first power cycle, the RSSI percentage shows up correctly on this screen.

Also, I was initially unable to get the manually-set RSSI channel on the “Receiver” tab to stick, until I disabled the analog RSSI option on the “Configuration” tab.

Thank you for all that you do!

Michele 18th December 2018 - 8:55 pm

By…good day, because I can not find the voice rssi? thank you on the radio

Claudio C. 16th October 2018 - 5:43 pm

Worked like a charm, thank you very much!

kelleysislander 26th August 2018 - 9:58 pm


Everything worked as described except for the last step, where I should see the RSSI % in the BF Setup tab.

Must be my board Talon F4 running CLR4 firmware. I see the channel move as AUX 3 as rssi fluctuates in Receivers tab, I can see it in the Telemetry page I set up in OpenTX on the X9D so it is set up as the RSSI channel, but no readout in teh BF Setup Page,and obviously, no value except blinking ) in the BF OSD…

Must be either mybnoard or that firmware it is running.



Jeffrey Lui 15th June 2018 - 5:46 am

Just wanted to point out that you need RSSI_ADC turned off in the Configuration tab in Betaflight or else you will get an incorrect RSSI value.

Kent Ross 11th January 2018 - 2:11 am

Thanks Oscar, working well, just 1 question:

The last step to drop the RSSI to 0 on powering off the transmitter shows:

“Important Note (Aug 2017): If you lose signal, your RSSI might get stuck at a value and does not change. You might become confused why you lost control but still getting good RSSI value. Here is how to avoid this problem:

Check on the receiver tab which AUX # your RSSI signal is.

After that go to the failsafe tab. All AUX channels are by default set to HOLD, they will just keep the last value when you switch off the radio. Set the correct AUX channel in failsafe to SET 1000 and save.

After this is done the RSSI will show 0% if your radio is off.”

Has anyone done this in iNAX 1.8 yet? The FAILSAFE tab does not show/allow changing the AUX configuration, and I don’t see it in the GUI. Command Line may work via “aux …”, trying to find documentation.

Thank you this is awesome.

Paal 11th March 2018 - 12:10 pm

Hi Oscar! when i’m running a EZUHF RX together with an EZUHF JR module on the taranis i don’t get the RSSI choice under “inputs”. Do you know how to set up an RSSI channel then??

Andrew 25th November 2018 - 7:23 am

With EZUHF you don’t need to use this since you can enable RSSI/LQ within the EZUHF software. In the software select what SBUS/PPM channel to use for your RSSI/LQ output. Once assigned, you’ll configure BF and the OSD as described here.

Jose Mato 1st November 2017 - 12:53 am

Thank you Oscar. Worked great on my QX7 and XSR receiver. Appreciate your easy to follow tutorial.

Szper 28th August 2017 - 2:09 pm

Hi Oscar!

Please add Edgar’s information to manual – Fail Safe settings when RSSI is send back to FC. Its quite important. I had an accident when I lost signal and I didn’t knew about that – RSSI was frozen at 57,… sticks was frozen too… whoops… wall+quad=!@#$! .

“Check on the receiver tab which AUX # your RSSI signal is.
After that go to the failsafe tab. All AUX channels are by default set to HOLD, they will just keep the last value when you switch off the radio. Set the correct AUX channel in failsafe to SET 1000 and save.
After this is done the RSSI will show 0% if your radio is off.”

Oscar 29th August 2017 - 5:57 pm

Excellent info, thank you!

Kaan 15th August 2017 - 2:31 pm

Hello Oscar,

I’m trying to find out what I should do to get the RSSI on my OSD with my Kiss and X4RSB setup.

Normally, I connect the sbus connection to FC with the Smartport to TX and I get the telemetry on my both Taranis and OSD. What else do I need to do anything else to get the RSSI?

I saw some people solders a cable to a little pad next to the antennas on X4RSB. Do I need to do that?

I’d be very happy if you could explain how I get the RSSI on my OSD step by step

Thank you.

Oscar 21st August 2017 - 2:29 pm

Sorry i don’t know about KISS, i don’t think it’s possible to send a RSSI signal to the FC via a RX channel.
Here is the RSSI output on the X4R-sb:
However I do not know if the KISS accepts PWM signal or analoug signal, so you might also need to make a converter for between the RX and FC like this:

Ricardo Costa 25th April 2017 - 5:19 am

With the new opentx 2.2 i cant feed the input source with RSSI, i dont have this option

alex 10th July 2017 - 8:02 am

i know its abit late but you need to select the option DISCOVER NEW SENSORS in the menu.

Henry 4th January 2018 - 2:02 pm

This really needs to be added in the above tutorial for later versions of OpenTX….it would have saved me a LOT of time….also that in order to Discover NEW Sensors, you have to bound to the RX and both TX and RX on….

Chris 10th September 2016 - 8:02 pm

Hi Oscar,

Thank you very much for this setup tutorial!.

Thanks to your tutorial I am finally getting RSSI readings on my Micro Minim OSD using a Futaba R7008SB RX connected to Naze32 via SBUS to CPPM converter. (Without any physical connections to the Micro MinimOSD!)

I looked everywhere to find information on activating the RSSI value in MWOSD via Naze32 using my hardware. Other information I found was either way over the top in terms of complexity or extremely vague and convoluted.

I have to say I was sceptical at first but I followed your advice exactly and to my relief and joy it worked exactly as you described!!

Thank you again for sharing your knowledge and writing fantastic articles of substance . Much appreciated.


Oscar 12th September 2016 - 2:20 am

that’s great to hear :)

Tim 26th May 2018 - 9:22 pm

Please can you tell me how you got an rssi value out of the r7008sb? Cheers

ChrisKrieg 20th June 2016 - 1:02 am

When setting up the INPUT scale, the newest OpenTX now lists dB as the units of scale. My D4R-II is using 8 channels just fine, but the RSSI scaling does not match your results.

When RX is powered, RSSI on the telemetry page of the Taranis is about 96dB.
When I unplug the RX, RSSI on the telemetry page of the Taranis falls to 76dB and then stays there in [square brackets].

It seems the Taranis is remembering the last know RSSI and keeps that value in the Inputs, which in turn is pulled by the mixer and prevents updating the channel 8 RSSI signal going back to the receiver. Any suggestions?

G.J. 29th July 2016 - 8:03 pm

Great tutorial Thanks !
Will this work with the X4R-SB receiver as well when using S-Bus ?

Oscar 7th August 2016 - 2:23 pm


Pierre 3rd June 2016 - 1:38 am

Many thanks alot for the RSSI at 1023 on MWOSD 1.6 !!!

You saved the day !

maxxxxoz 17th May 2016 - 10:19 am

Hello oscar. How can we do this with Radiolink AT9 R9D ?

dmerc 12th April 2016 - 4:09 am

This is exactly what I needed to get RSSI on the BeeRotorF3 FC with a D4R-II RX.
Thank you so much for posting this.

Trent 20th March 2016 - 3:48 am

Hi Oscar

Thank you for your work! I am a total noob and can’t find a solution to this problem anywhere. My problem is when I go to enter the “source” in the mixer selection, there is no RSSI option. Is there an easy fix to this? An upgrade or download I am missing? Any help is appreciated.


KEN KIRKPATRICK 25th March 2016 - 12:18 am

Hi Oscar, I figured out why the RSSI values were locked at 100% on the minimosd. I am using MWOSD 1.6, BetaFlight 2.5.3 and changing the RSSI max setting in MWOSD to 1023 fixed it. So not 255, it should be 1023. Thanks.

Jordan Marinov 15th April 2016 - 10:27 pm

Hi Oscar, this comment helped me so much. (big thanks to the author) If 1.6 firmware gets more popular, I see many folks getting stuck on this like I did. We should raise visibility, I’ll look into putting a page on the forum, unless you or OP beats me to it or if you update the tutorial :)

Oscar 18th April 2016 - 12:46 pm

Thank you Jordan I have just put a reminder note in red :)
thanks for the great suggestion!

Yann38 18th April 2016 - 3:59 pm

On last firmware of Taranis you need to go to telemetry and slect discovered new device to find RSSI, if not you will not have in source. when it is done you can find it. discovery should be done when quad is power on, mean RX receptor power on.

MANUELE 21st July 2016 - 9:38 am

Hi Oscar,only one question.
Do you think I can get the same result using a Turnigy 9x with er9x installed please ?



Oscar 24th July 2016 - 2:24 pm

I am not sure i don’t have the 9X anyway…

ssma 7th March 2016 - 2:36 am

Hi Oscar,

If i want to power the micro minimosd module with an external regulator, which wires should be removed?
Do i need a cap on the regulator output?
I have 2 servos and when i control them the mmosd signal is lost, i use apm2.5 and the voltage
regulator is a polulu 5V, 5A.

And also i have one battery for frame and second for vtx, which one should i use for regulator?
because i burned a minimosd in the past when i was trying to use the same battery for both.

ssma 7th March 2016 - 2:47 am Reply
Oscar 7th March 2016 - 5:29 pm

If you are powering the micro minimOSD from external 5V, you can remove the 5V that connects to the FC… however you still need the GND going to your FC from minimOSD so your TX/RX has a voltage reference also minimises noise. (so 2 GND, one connect FC, one connects the 5V source)

you shouldn’t need a capacitor… but if you are getting unstable OSD (disappearing text overlay when punch out), then adding a cap should help

KEN KIRKPATRICK 24th March 2016 - 11:26 pm

Hi Oscar, I followed your instructions on configuring my Taranis Plus to provide RSSI to my miminosd. I am using a FRSKY D4Rii in PPM mode. I flashed the D4Rii to the current firmware. I assigned RSSI to chan 7. I see the RSSI value in BetaFlight 2.5.3, and I can see the values change in the receiver screen and setup screen. I configured MWOSD per your instructions. But, my Fatsharks show RSSI at 100% always. I can change some of the values in the mixer screen and my Fatsharks will display 0 %. No active reading however. I am out of ideas.

steven 17th February 2016 - 4:33 pm

Hi Oscar

Can you show me how to setup on the Futaba Transmitter?
To get the RSSI from PPM Channel like you Show on top?



idar 10th February 2016 - 7:48 am

hi oscar love your work, just a heads up you can get a direct rssi pad on x4rsb, you have to carefully unwrap esc cardboard cover, turn with arieal wires faceing up, the rssi pad is right infront of the right arieal, mine was covered by glue they use to hold arieal in place carefully clear glue to expose rssi pad, pre tin pad and find sutable wire to solder to pad and use a little hot glue to hold wire in place i ran my wire straight out on side of pins, put cover back on and you now have a x4rsb with a direct rssi port, that you can connect to flight controller osd etc, if you want pictures just google xr4sb rssi connection and it will take you to pictures, cheers idar

Oscar 15th February 2016 - 1:52 pm

thank you idar
is the RSSI signal on this pad a PWM signal or analogue voltage level signal?

Riquez 29th December 2015 - 5:40 am

Hi Oscar I got this working thanks to your guide but the % values shown in the MW OSD are strange.

49% (flashing) when first powering quad (taranis OFF).
90% once I turn on taranis – it goes up & down a bit as i move around, looks like it’s working.
Turn off taranis & the % freezes on the last value.

Riquez 29th December 2015 - 6:19 am

Hi Oscar – re “Turn off taranis & the % freezes on the last value.” – it also does this in the Cleanflight receiver tab, aux3 will freeze on the last value when turning off taranis.

Edgar 1st May 2016 - 8:16 am

Hi Riquez
I had the same problem. I solved it in the following way in CleanFlight:
Open CleanFlight Configurator
Check on the receiver tab which AUX # your RSSI signal is.
After that go to the failsafe tab. All AUX channels are by default set to HOLD, they will just keep the last value when you switch off the radio. Set the correct AUX channel in failsafe to SET 1000 and save.
After this is done the RSSI will show 0% if your radio is off.

Paul Cheung 7th December 2015 - 5:27 pm

hi oscar
i’m setting up with tranis and 3/16 s buss reciever and f3 controller is it still the same hook up for rssi. also a side note question i have a voltage discovery beeper how do i hook up discovery part with this reciever as its not putting out ppm signal can i set up with a switch ? i dont think i can use the naze buzzer out as its just pos and neg no signal wire any ideas? thanks Paul

Oscar 7th December 2015 - 11:48 pm

normally you can just hook up a buzzer to the flight controller, and it can be configured in cleanflight to be activated using a switch, or lost of radio signal, or low battery level. have you ever used a naze32 board before?

Andy 12th November 2015 - 1:07 pm

Hi Oscar, I am trying to get this work with the x8r and pixhawk but having problems

I have setup channel 10 as rssi input and output like you have here and confirmed i get the right figure when tx is at 100 percent and also when its switched off.

I have my x8r bound so that sbus does channels 1-8 and pwm does 9-16 (binding mode 4)

the rssi out on the x8r doesnt work so im trying this method here. i connected a servo lead from channel 10 to the sbus on the pixhawk (rssi in) with the voltage wire removed, I have set minim osd extra to read mavlink data on the RSSI option. but i am still getting pulsing inacurate figures.

any clue?


Albert Saerong 13th October 2015 - 3:47 pm

Hi Oscar,

Have you tried this with OpenTX 2.1? I’ve upgraded mine to 2.1 which unfortunately doesn’t have RSSI as option for Source.. :( is there any other way to get RSSI as Source in OpenTX 2.1?

thanks in advance, cheers, albert

Albert Saerong 14th October 2015 - 3:40 pm

Hi Oscar, Found it! works as well for Open TX 2.1 :) Don’t forget to do the sensor discovery ;)

Kubz 18th November 2015 - 3:12 pm

from the RSSI screen you have to first SCAN FOR SENSORS, it will then detect your telemetry and enable all those outputs. I had the same problem and found that this is the recent change.

Carl 16th September 2015 - 11:10 pm

Hi Oscar,
Thanks! This combined with Vbat out from the nase32 makes the KV team minimOSD mods almost moot.
For me this is great as I have a defective board that the seller (FPVmodel) doesn’t want to reimburse me for. I have a normal minimOSD board from an Ebay seller I will use instead… after desoldering from PDB.

Oscar 21st September 2015 - 12:44 pm

Yes Carl, i feel the same!
Any MinimOSD (even the one from hobbyking) works great now :)
but the price difference is so small, KV team ones are a bit more flexible i guess

javier 15th September 2015 - 8:44 am

Hi Oscar,

Is it possible to do this with er9x firmware?

(turnigy 9x or 9xpro)

Dagob 25th September 2015 - 6:16 pm

Same here! I can’t get RSSI from tx directly into micro minmosd, when the signal wire is plugged the OSD freezes. I want Instead get RSSI on PPM Channel, but like Javier, no taranis here, any idea how to perform this into TH9X? Without RSSI the d4r is for my currently project useless. Many thanks for all those tutorials.

Oscar 29th September 2015 - 4:16 pm

try to put a low-pass filter in between OSD rssi input and RX rssi output

Mike 12th September 2015 - 4:15 am

Hi Oscar

Forgive the noob question but can the same process be used to send RSSI over an Sbus channel on the X4R-SB? It seems analogous to send via a PPM channel.



Oscar 14th September 2015 - 3:24 pm

Yes I think it should work as the setup on your Taranis is the same… only different is how you set it up in Cleanflight… sorry i don’t have a SBUS compatible RX and FC to test this at the moment.

Lilo 27th October 2015 - 11:56 am

Oscar, do you have a X4Rsb now ? Please update this tutorial with the configuration differences

MIJABA 27th October 2015 - 12:34 pm

Hi Oscar

I have already a Taranis with X4R-SB. I have followed all the steps but comparing both values of RSSI (the own Taranis RSSI lecture, and the calculated by the CH7) and they have huge differences.

Have you already tested in this enviroment?

Thanks Oscar for your help.

Wes 6th September 2015 - 3:04 am

Hopefully someone can answer this for me. I have been flying my quads with my Futaba heli radio, but I am moving everything over to the Taranis. I have RSSI setup properly on channel 8. In Cleanflight I can see my battery voltage, current draw and RSSI says 99% or 100%. My issue is when I go in to Companion TX or on the radio itself, on page 12 which is Telemetry on the radio and screen 1, there is no Cell or Cells choice. There seems to be no real FC/Quad telemetry choices to choose there most of them seem related to the radio. Looking at your screens above and a couple of videos, these should be a choice on the telemetry screen as well as others. Any idea what is going on?


Oscar 7th September 2015 - 12:41 pm

maybe you have an older firmware on your Taranis?

Simon 14th July 2015 - 3:12 pm

Hi Oscar, before we proceed shouldn’t we upgrade firmware on D4R-II to 27ms firmware?

Oscar 15th July 2015 - 12:12 pm

i didn’t update firmware, all default and worked fine.

Simon 15th July 2015 - 7:41 pm

Guy from BMSWEB channel on YouTube under his video about 27ms upgrade mentioned it several times that FrSky doesn’t recommend using more than 6 channels in CPPM. Additionally I found reddit thread with similar instruction to yours where author mentioned at the end “P.S. be sure to be using a 27ms receiver or flash yours…”

Oscar 15th July 2015 - 8:13 pm

Hi Simon, you are making a very good point, just checked mine and it’s got the 27ms firmware pre-flashed.
i will put a warning up in the post about this issue!
thanks for reminding!

Simon 15th July 2015 - 8:32 pm

I’ve downloaded D4R-II.pdf manual file where I found that it’s correct what I mentioned in previous comment:

“CPPM channel channel channel channel can not handle all eight channels channels channels channels at the same time with all throws are maxed out, as it does not have enough frame gap. It is recommended recommended recommended recommended to use at most six channels channels channels channels from CPPM channel channel channel channel while leaving leaving leaving leaving off the rest two channels, channels, channels, channels, otherwise otherwise otherwise otherwise improper improper improper improper performance performance performance performance might occur.”

SimonSimon 14th July 2015 - 2:15 pm

Hi Oscar, should I change anything with cables?

Simon 14th July 2015 - 2:46 pm

Delete above comment. BTW your comments work quite strange on mobile.

Oscar 15th July 2015 - 12:11 pm

strange? what way?

Oscar 15th July 2015 - 12:11 pm

no no change to cabling.

Pharoz 7th July 2015 - 11:33 pm

Hi Oscar

Brian, you can follow the direction here to upgrade your Taranis to the latest OpenTX version, which is at 2.0.17. It’s pretty easy.

Les Elkins 2nd July 2015 - 6:38 pm

Interesting. I *swear* I had RSSI on my OSD working back under CleanFlight 1.7.something, then upgraded to 1.9.something and it went away with no hardware changes. I haven’t spent much time dinking with it, but I’ll give this approach a try.

Steve Davies (Ddraig62SPD) 2nd July 2015 - 9:47 am

Hi Oscar

Hope your doing well. Another great tutorial! You always seem to know the RIGHT info to post :-)
Painless360 also has a good YouTube video on the same topic.

I asked a similar question on your related thread (below) but here it is again.

You show how to setup the RSSI/PPM channel on the X9D Plus, however I have the standard Taranis X9D running on the original firmware that came pre-loaded when I bought it over a year ago (OpenTx-r2940, 02-02-2014). My problem is that (i) I don’t have the INPUTS screen on the original X9D firmware (just STICKS and MIXER), plus (ii) I don’t see RSSI (or other telemetry parameters) as an available source when setting up a new CH in the MIXER screen …. so I’m kinda stuck.

I’ve read the original manual and there’s no mention of being able to assign telemetry parameters so suspect that I need to upgrade my X9D firmware to a newer version in order to make these features available … but if you think there’s a way to do it on my current firmware I’d be keen to hear any inputs.

Anyway, keep up the good work.

Cheers, Steve

Steve Davies (Ddraig62SPD) 6th July 2015 - 10:56 am

Upgraded my Taranis firmware so was able to configure my X9D as per the tutorial. RSSI now visible on my MWOSD. Thanks!

Brian 7th July 2015 - 2:17 am

Hi Oscar


Where did you get the latest firmware for the X9D? I looked on the Frsky site and its pretty old and matches what I have now. I have the same issue you seemed to have.

Site is this

Any direction appreciated.


Oscar 8th July 2015 - 10:42 am

julien 31st August 2015 - 2:22 pm

Hi Steve
did you also Update the D4r2 firmware…??
because i update taranis Firmware… and nothing change ??