Setting up FrSky Receiver Redundancy

[@TheLucas2696]

I'm in the process of swapping over to FrSky with an X20S after being with Spektrum for about 10 years. Lost a 30cc gasser to complete RF signal loss and decided that was enough for me. Your videos are definitely helping me get used to the new system, thanks a lot 🤙

[@MrD]

You’re welcome Lucas. Yes, unfortunately at my flying field, if there is ever a signal problem, I can guarantee it’s someone using Spektrum. My 30cc planes will be getting redundancy like this too. I’ve not ever had an issue with RF on FrSky. But better to be safe than sorry.

[@udxpierre]

16 Years Spektrum......going x20s and all the other bells and redundancy whistles. Fly 120 and 130cc 3d and scale planes(glider tug 120" 188 Aggie) Refuse to pay another plane's worth to have the "best".........

[@scottyd035ntknow]

Why I'm switching to it as well. I've got a few 20cc gassers going together and some giant scales and I don't trust a Radiomaster for that. These X20s are basically a cheaper Jeti at this point and that's freaking awesome.

[@MrKenwillis]

@@MrD can I use my s8r receiver as the master receiver for redundancy? I’m also using the xm-plus for my extra receiver

[@MrD]

No, the S8R doesn’t have SBUS IN. That is required for a master receiver.

[@daniebecker7704]

Thank you so much for this video, I am busy with a 30cc Extra and was not sure how to setup the redundancy on the Access receivers. There are lots of videos that explains the accst system but not Access. Great video. 👍🏻

[@MrD]

No problem. I’ll actually be doing the same with my 30cc Extra 😄 I hope the install goes well and she flies like a good ‘en.

[@kitchenstrand]

Hello Darren, would a video on telemetry, sensors and data logging WOULD be a worth while film!

[@tanguybentot2880]

Hello Thank you for taking the time to explain and to resolve our problems .

[@MrD]

You're welcome. I'm glad the videos are helpful.

[@SILVIOFRANCO1]

Thanks, MrD. Excelent content about redundancy. Awesome

[@MrD]

Thanks Silvio. Glad you enjoyed it.

[@memopescador]

Thank you my friend, this video has been very useful

[@MrD]

Thanks, I’m glad it helped 👍🏻

[@MATTIIAO]

Great videos as always!! Helping me out a lot at the moment! Cheers

[@MrD]

Glad I could help 👍🏻

[@ElseysEmpireRacing]

Hi Darren. I want telemetry from both receivers, (RSSI, Rx Bat etc) can I use F-Port to achieve this somehow? I have a SR8-Pro with a R9-Slim+OTA and the telemetry from the external sensors is lost using F-Port however only the SR8's sensors show using S-Port. I'm using EdgeTX on a X10S Express radio. Thanks (I'm not real familiar with F-Port)

[@hoyvintagecycles2936]

can you explain the advantage of this compaired to the new Dual frequency receivers like the TD series. Is this just for signal loss on one reciever?

[@MrD]

The advantage is that not everyone uses the new TANDEM system. I would guess that there are still more people using FrSky transmitters that don’t support TANDEM, than do. So they can set this up and have redundancy. TD does provide both frequencies on the same receiver. It actually uses both frequencies simultaneously when in range. It’s not just a switching frequency redundancy. So it could be argued that if you’re using a single 2.4 GHz and single 900MHz non-TANDEM receiver. That you could just replace them with a single TD receiver. But, there’s also nothing stopping people using TANDEM from also setting up redundancy. For example using a TD MX as a redundant receiver for a TD R10. This would give an extra axis of coverage for both 2.4GHz and 900MHz.

[@Tom-wl9sx]

Very good video. Will put a redundancy receiver in my Yak 55.🙂

[@MrD]

Nice Tom. It’s great to hear about all these big planes 🙂

[@kitchenstrand]

To check redundancy. Could you just turn off the 2.4 RX.... and vise a versa

[@MrD]

Yes, that would probably work 🤣 I’ll have to try that. Sometimes the simplest thoughts are the best.

[@fyremind]

Your channel is a lifesaver! Curious , setting up this exact set up sr10 pro and a r9 sx, after binding I am assuming you can temporarily disconnect the r9 to do the initial sr10 calibration sequence? Then plug it back in?

[@MrD]

Thanks, I’m glad the videos are helpful. Yes, you can remove the R9 SC while setting up the SR10 Pro. That’s fine.

[@kitchenstrand]

Darren, some say you can NOT use a stabilizer RX in redundancy. What do you say'? Have you seen?

[@MrD]

As far as I understand it. You can use a stabilised receiver as the master receiver, ie the one the servos are connected to. They can’t be used for any of the redundant receivers. I did check with FrSky, and they confirmed this. But I will also do my own testing in the near future.

[@RippinRichRC]

When you have 1 or 2 batteires plugged into the sr10 do you need to remove the red wire from your throttle/esc ?

[@MrD]

If it has a BEC in the ESC, yes.

[@afbenaza]

Is it possible to bind 2 Access Recievers together? Like an SR10Pro with stabilization on and an R6 or R8 for additional channels?

[@MrD]

You’re better off using the SBUS out of the SR10 Pro to connect an SBUS to PWM adapter. If you are using the R6 or R8 as a redundancy receiver, you can’t use their PWM outputs. Only use the outputs of the master receiver.

[@shurdba]

Darren; I'm wondering if I can use two TD R10 receivers with the X20. I've been told that that the TD receivers are the best Frsky has for a big gasser. If one is good, two must be better. As always, thank you so much for your help.

[@gregorymoss7305]

Thank you for that very helpful demo video. I have followed your setup exactly using a X20S, SR8 PRO as main receiver and a R9SX as redundant receiver using SBUS with CH 6 set to SBUS and connected to the SBUS in on the SR8.. All works as you described until I switch model ID back to disable the SR8 which now has a red light and R9 has green light but get no servos working from the redundant R9 receiver. Can you think if something I have missed, Can’t seem to get the redundant receiver to take over no mater what I do. Appreciate your help as not many resources for such a new system, Thanks, Greg.

[@MrD]

Hi Greg, glad you got this sorted, sorry for the late replies.

[@randallpatrickc]

Supplementary question please? I changed the Rx number of the 2.4 Rx to test failover but the servos stop working. I'm getting good RSSI on both Rxs. Am I doing it right? (ps., following your excellent review of the X20S, got a nice red one yesterday :-) Highly impressed so far. Just following your Ethos Suite & update vids - going to be back here quite a bit I can see. Great content - very clear) Update - doh.. hope you haven't read this yet. Silly me didn't change Ch6 on R9SX to Sbus. Hence the no failover. All well now, Just change the Rx number on the SR8 and servos keep working from the R9SX. (That said, huge amount of RF interference from R9 antenna to servo (long lead next to them). Having to try to find another spot for them further away from that lead. ('course I'd just finished hot glueing the antenna in the bottom of a highly inaccessible innards..)

[@andrelafreniere8604]

Can I assume that I can connect an SR10(Stab.)receiver with a GR6(Vario)receiver ? Thanks

[@MrD]

Yes, the GR6 has both SBUS in and out, so can be used as master or slave. With your setup the SR10 Pro would need to be master, as it is stabilised. The only caveat is that you would lose the vairo telemetry if the radio link is lost from the GR6.

[@lightbulbjim]

Does this work with a plain 2.4GHz ACCESS radio (non-tandem) with an R9 module in the back? Additionally, would this work with a second module/RX of a different protocol, as long as the RX used SBUS and the channel mapping was the same? eg ELRS, Crossfire etc.

[@MrD]

Hi Jim. Yes, it will work on regular ACCST as well as ACCESS. To be honest, I’ve never tried that. I guess if the Crossfire receiver was outputting SBUS, it could work.

[@kitchenstrand]

Dr. D ! Can you bind a SR6 to a TD R 18 to get stabilization for a gaser?? Or what two RX would you bind for lots of Channels, redundancy and stabilization? Or would you use the SR8 pro?

[@MrD]

Hi Fred, unfortunately not. You can't mix protocols. The TD R18 being TANDEM, and the SR6 being ACCESS. At this point in time, for stabilisation and redundancy, you would need to pair an SR8 Pro or SR10 Pro with and R8 Pro or R9 MX. Or with the tandem route, you would need to use one of the stabilised redundancy busses. RB30 or above I believe. It really depends on the size of the gasser, and how many channels you need. I'll be putting the SR10 Pro and R9MX in my 30cc planes. Well, if a stabilised TANDEM receiver comes out before I buy the receivers for the 2nd plane, I may use one of those instead.

[@jcajhen]

Great videos, thanks a lot; you rock with your clear and logic explanations! I am new with Frsky, been using Futabas only in the past 35 years ... Could you please do a Video using RB-20 in redundasy scenario? BR, Janko

[@richardlong3615]

Great video!! - I have a couple of issues I wondered if you might have a solution for 1. how to get 16 channels from two X8R receivers and 2. how to set up the throttles on a 2 glow engine plane with throttle cut on either or both engines and failsafe on both engines and independent trims to set up the idle on both engines

[@MrD]

Hi Richard, Sorry for the delay in getting back to you. For the 16 channels, instead of using 2 receivers. I would take the SBUS out of the X8R and attach it to a SBUS to PWM adapter. Bind the X8R with channels 1-8 as normal, and use channels 9-16 on the SBUS to PWM converter. Which transmitter do you have and what firmware are you using? The two engines shouldn't be too tricky to work out. The trim may be the biggest problem. Failsafe would probably be the easy part. As you could just use a custom failsafe and set the output to the channels with the engines to an idle throttle, or off, whichever is your preference.

[@richardlong3615]

@@MrD Thanks for the reply since asking the question Ive worked out the 16 channel problem but the twin engine problem remains and its having separate trims to allow setting of idle speeds to the individual engines

[@markusmorbitzer6500]

Hey Mr D. Thank´s a lot for the video. It´s defently worth and very helpfull. As some other mentioned it would be very nice if you can explain this scenarion in combination with a RB 10 . That´s what I struggle with. Would be very nice.

[@MrD]

Thanks Markus. Already done kzbin.info/www/bejne/h2ackpxtqL90Z6c ;)

[@zacksinclair5532]

Wanna ask yours opinion..i have frsky horus x12s and it fine if i use this r10 pro together on my 3d gas plane? But never use it under horus x12s transmitter still keep in box

[@MrD]

Sorry Zack, I don’t quite understand the question. The R10 Pro is fine for use with gas planes. All the Pro and tandem receivers are ok to use with electronic ignition engines. You may not be able to use the R10 Pro with the X12S. It depends on the type of RF module installed. If it has an XJT module, the R10 Pro, and any other ACCESS, won’t work. If it has an ISRM module, it will work.

[@P222RL]

hi, nice video, is it a must to turn off the telemetry of the slave receiver ? because if not it will crash with the telemetry value of the master receiver ? thank you

[@MrD]

Hi Peter. This has all the answers kzbin.info/www/bejne/h2ackpxtqL90Z6c

[@P222RL]

Thank you very much 🙏🏼🙏🏼🙏🏼

[@scottyd035ntknow]

Now with the Tandem dual band receivers coming out is there any real benefit to having this dual satellite setup? Maybe to get some separation of the antennas?

[@MrD]

The redundancy is less important with the Tandem receivers. But, they will still give you more RF reception as you can still cover all angles. The separation would also help. Plus if an antenna gets knocked off or shakes loose, you have more protection.

[@DEeMONsworld]

thanks for this, I'm using a tdr12 rx plus a TDMX satellite rx, I assume everything is the same. Somehow missed that you must have telemetry off on the satellite, mines working , I'll have to check tomorrow whether my TDMX has telemetry switched off, what are the repercussions if it isn't? I'll have to make another model for testing the TDMX, as now I just have one plane set up.

[@MrD]

With protocols newer than ACCST. You can have telemetry enabled on all receivers.

[@carlpayne6024]

Thanks!

[@MrD]

Thank you very much 👍🏻

[@P222RL]

Hi, thx for the video , I tried to turn both telemetry on , it works and show both 2.4 n 900 DB , may I know why I cannot turn the Slave receiver telemetry on ? Thank you

[@MrD]

Because ACCST was not designed with telemetry from multiple receivers. ACCESS was. What’s in that video is the official answer from FrSky.

[@P222RL]

@@MrD thank you very much 🙏🏼🙏🏼🙏🏼🙏🏼

[@Didi-dd7xt]

Hi Darren, great video on back up receiver. Can we use the back up receiver to drive few servos

[@MrD]

No, all servos should be plugged in to the main receiver. The data only goes from the redundant receiver to the main receiver, not the other way round. I need to check, but it could be that the SBUS out from the main receiver will be from the strongest signal. So you could potentially use that and an SBUS to PWM converter to operate more servos. But I’ll check with FrSky to be certain.

[@randallpatrickc]

Just found your excellent channel. Great stuff. Never done redundancy before so this will be a great help. Did you figure out if a couple of SBUS - PWM converters could be used with the main Rx? And, How do the stabilization features work with this redundancy. I have a SR10PRO right now, what would be the best slave to use? I have a SU30 with vectored thrust so need the extra channels and when the battery is between me and the RX, I get low RSSI - twitch twitch!

[@hydrojet7x70]

So the SR10Pro / R10Pro, they are advertised as very good for gasoline or petrol aircraft for the fact of antivibration and anti-spark. Fast forward a year later to today, and they have the TDR-18. Would you use the TDR-18 In a gas/petrol model? I need 14 channels so I would either buy 2x R10Pro’s Vs 1 TDR-18

[@MrD]

Yes, all TANDEM receivers (including the TD R18) are safe for spark ignition engines. I’ve seen people use these in some pretty large petrol planes and turbines.

[@hydrojet7x70]

@@MrD thanks

[@gorilahive]

Another really good informative video, please can you do one for how I can put my own model photos on my x20s.

[@MrD]

Thanks Pio. Sure, I’ll add it to the list 👍🏻

[@gorilahive]

@@MrD Thanks.

[@mnourse26able]

What are you setting your outpower to on the 900mghz? I have found that low power makes the servo jittery increase the power all is good.

[@MrD]

I usually have it at low power. I put it there on the bench, then forget to put it back up again 🤣 Jittering servos are usually the telemetry side with the 900MHz receivers. I get jitter on my MiniAR wing. Turn off the telemetry and they stop. Not noticed any issues in flight though.

[@cmtetaboaco]

If I use 2 G-RX8 is it possible to use more than 8 servos connected, connecting to both RX PWM outputs?

[@P222RL]

hi, may i ask what is a good way to mount the 900 antenna on to a freewing 80mm A10, thank you very much

[@MrD]

If only one antenna, vertical is best. Make sure the transmitter antenna is vertical too.

[@P222RL]

@@MrD thx mr d , I am using R900SX and I guess it is too long to mount it vertical and there is 2 antenna

[@MrD]

With that receiver one vertical and the other horizontal would be the best orientation for an EDF. You don’t need to worry about range.

[@P222RL]

@@MrD yes, that will be perfect, assuming you said vertical doesn't mean it should be a straight line vertical, i can only attached it onto the round shape fuselage, which will like a C shape if you look it at the front of the plane, is it still good ?

[@frank-vq4mx]

Having the antennas on the out side. Does this apply to our "foam" e.d.f. jets ?

[@MrD]

No, this is for carbon fibre moulded planes here. With foam, the antennae are fine inside. Just make sure they are clear from RF blockers like carbon and the battery.

[@tedh173]

Great video Mr.D.! Your video had 2 receivers setup... Question.. is it possible to connect 3 receivers together such as with the main one being a FrSky 2.4GHz ACCESS ARCHER SR10 Pro, and connect redundancy to a FrSky R9 SX for 900, and from the R9 SX connect another redundancy to a FrSky 2.4GHz ACCESS ARCHER SR6 RECEIVER. I am planning a setup for a turbine jet, and I want the main receiver to be SR10 Pro with gyro built in, and having 2 additional redundancy in the R9 SX for 900, and another redundancy for 2.4 in the SR6. I know... I just want to be careful.. Thanks.

[@MrD]

Thanks Ted. Yes, you can connect 3 receivers together. The only requirement is that both the master receiver and first redundancy receiver have SBUS IN pins. With that setup, just remember to only have stabilisation enabled on the master receiver. It will need to be disabled on the SR6.

[@tedh173]

@@MrD Love your video learning so much... Question.. At time period about 11:40, you mentioned only 2.4GHz RSSI show and 900 RSSI did not show, bc of turning off telemetry in slave 900 receiver. My question is, is it ok to enable 900 slave telemetry on, so we can see both 2.4 and 900 RSSIs, or not a good idea? It's just comforting to see both RSSIs on your Xmtr working... Thanks.

[@MrD]

With ACCESS, yes. You can enable telemetry with all receivers. With ACCST, you can only enable telemetry on the master receiver, not the slaves.

[@tedh173]

@@MrD Thanks! I'm in the process of moving from Spektrum to Frsky. Bought an X20S a month ago and learning a lot. Thanks to your video.

[@MrD]

I’m glad the videos are helping Ted. I really hope you enjoy your new transmitter.

[@Avecfort]

Is there a reason you couldn't just turn of the 2.4ghz transmitter and keep the 900mhz on the check redundancy? Also why can't you have telemetry on both? Seems to work just fine when I have it on. But haven't flown that way since you said one shouldn't.

[@MrD]

Yes, you can turn off the 2.4GHz side and then 900MHz. With ACCESS you can use telemetry on both. With ACCST you can only use telemetry on the master receiver. kzbin.info/www/bejne/h2ackpxtqL90Z6c

[@duschiavon]

Hey mate. Is that ok to use a R9MX for redundancy on a 35% aerobatic plane or should I get a R9 SX just like the one you showed? Thanks

[@MrD]

R9MX would be fine in an ACCESS setup. I used the R9 SX as it has pins, so easier to demonstrate.

[@ElseysEmpireRacing]

Darren, can I use 2 receivers, one on 2.4, the other on 900mHz with an X10S on OpenTX ? I would have the R9-2019 module and the internal RF turned on at the same time. Thanks for your help as always.

[@MrD]

Sure. That will work.

[@ElseysEmpireRacing]

Low and behold, it works. I wanted a stabilized Rx and 900mHz and Redundancy. FrSky doesn't make a 900mHz Rx with S-Bus in, so I used a 2.4 g SR8 Pro as master, with a R9 Slim+ and left the telemetry on on both. I believe the slave Rx telemetry is ignored automatically, as I had great RSSI after changing the Rx # for both receivers. The green light went out separately from both yet they still always operated the servos. Till now I thought you could only have 2.4 and 900 together using an X20 and ETHOS. I wonder how fast the Tx battery will deplete running both frequencies?

[@MrD]

@@ElseysEmpireRacing I tend to run an external battery with the R9 on my X10S. You may find that will help if the internal battery is used up too quickly.

[@stevecopelin5264]

@@ElseysEmpireRacing I was chasing this answer, couldn't find anything on having both 2.4 and 900mhz. Having a big glider for Triangle racing, the 900 is just insurance. So if this is right, as long as both receivers are on the same protocol (Access) we can have 2.4 on one rx and 900 on the other rx?

[@MrD]

Using a TANDEM transmitter, they would need to be the same protocol. You can only set that once. But, using something like a Horus X10S Express. I think it could work with different protocols. Because each module (internal 2.4 and external 900) are set up separately.

[@rjmonroe]

I am using an SR10 Pro with an R9MX for redundancy. The conventional wisdom is to disable telemetry on the R9MX. Can you tell me why? I ask because I have the R9MX located in the horizontal stab where it is not visible. The only means I have to determine the R9MX is functioning are the signal bars that appear on my X20.

[@MrD]

With ACCESS you can use telemetry on both receivers. It was only ACCST that only the master could use telemetry. kzbin.info/www/bejne/h2ackpxtqL90Z6csi=u0c-ooZ3npcDPRov

[@jjames5928]

What about 2 RX ( TDMX ) going into a RB35s Can I have telemetry on both RX as they are both master rx

[@MrD]

You can certainly connect 2 TD-MX receivers to an RB35S. In fact, I will be soon. As far as ai understand it. Set both receivers to use FBUS for telemetry. And it will all just work.

[@jjames5928]

@Mr.D - Falling with style I've got them set to Fbus. I just wasn't sure I can have telemetry turn on both RX or not

[@MrD]

Yes, you can. FBUS includes telemetry and signal. So it’s all taken care of.

[@_F5X]

Hi, can any Archer 2.4 and R9 Receiver (wiht S.Bus In/Out) be combined with each other for an redundant usage? example: archer GR8 & R9 MX. thnx

[@MrD]

Yes. Just take the SBUS out of the R9 MX and plug it in to the SBUS in of the GR8.

[@bodhescheerer1380]

Is it possible to use the PWM outputs on the redundant receiver as additional outputs?

[@MrD]

No. Its better to take SBUS out of the master receiver and use an SBUS to PWM adapter.

[@bodhescheerer1380]

It appears to work if the redundant receiver has an sbus in hooked up to the master sbus out

[@MrD]

@@bodhescheerer1380 it’s not designed to work that way. I couldn’t guarantee that it would be reliable or work in practice.

[@bodhescheerer1380]

@@MrD does the X8R, which specifically advertises this ability, have something different hardware or software?

[@MrD]

Having SBUS IN connected to SBUS OUT on both receivers, in a bidirectional configuration has never been advertised. The 2 X8R receivers were both just bound to the transmitter. One accepting channels 1-8. The other channels 9-16. The receivers weren’t linked, nor was there any redundancy. They each only handled the channels they received over the air.

[@nakul3424]

Thanks a ton for your videos man! really informative stuff and got me started with Tandem. Can the spare pwn channels on the slave receiver can be used as exention to the 10ch on SR10? Meaning the slave channels will be 11, 12, 13 etc ?

[@MrD]

No, you should not use any pins on the slave receiver. They will not get any channel information if it loses signal. The SBUS connection is one directional, so the data only ever goes from the slave to the master. The better option would be to use an SBUS out from the SR10 Pro (master) with an SBUS to PWM converter. But, you’d only really gain channels 13-16.

[@shurdba]

Mr D: I'm having no luck getting a high precision vario to work with a R10 pro. Not sure if it is a bad sensor or there's something new with adding the vario to the R10. Can you point me in a direction? Thanks, Steve

[@MrD]

Hi Steve, It should just be a case of adding it to the S.Port connection. I did have problems with a sensor on an earlier ACCESS receiver. The receiver needs to be set to not use FPort. Mine wasn't. But I had to toggle FPort on then off and it then started working. IT may be worth trying that.

[@shurdba]

@@MrD Thank you for getting back to me. Coming from years of X series receivers, I was using the rx port for jr style plugs instead of the little white four pin port. Once plugged into the correct port and toggling the F. to S. on the radio, it worked.

[@MrD]

Awesome @@shurdba. Glad it’s working for you.

[@greenroom8454]

Will it work if the master receiver is connected through f.port

[@MrD]

I don’t believe so. To be honest, I’ve not tested it. I do wonder if that would cause issues with receiver sensors though.

[@greenroom8454]

@@MrD ok thank you

[@ChunkyC_RC]

Great video! I use these same 2 recievers for my redundancy. Can't you just turn off the modules separately to check if the redundancy is working? It works on mine that way. Also, I don't understand why you can't run telemetry on the slave. I have turned it on with no ill side effects. Maybe you can explain that.

[@MrD]

Thanks Chris. I did try that to test, but the receivers never reliably lost the bind. It wasn’t until I bound to a different ID that I was guaranteed only one receiver being bound at a time. I believe the master has to always bind with the transmitter before you can remove it. In all honesty, I don’t know why they say to only use telemetry on the master receiver. Perhaps conflicting telemetry IDs or something like that? That is just the recommended way to set it up. So I followed the guidance.

[@frank-vq4mx]

Good Morning. The instructions for the R9-SX do not instruct on antenna orientation. What is the recommended orientation for this type of antenna ? The redundancy setup works beautifully. Another question. My is the telemetry turned off for the second receiver ? I experimented with this. Having the R9SX telemetry enabled allows the user to actually see and hear which receiver has lost and regained it's respective signal. Isn't this a beneficial ? Thanks

[@MrD]

Hey Frank. With ACCESS, you can bind both with telemetry. I'll be making a video to square all this up after chatting with FrSky. With regards to the antenna orientation, it would depend on the type of flying you're doing. Most types will be the same as when setting up 2.4 diversity antennae. So one vertical, the other horizontal. But, if you're flying long range, an elongated X (taller than wider, so more vertical), viewed from the side of the plane, gives better performance.

[@freespirit3152]

Could PLEASE Demonstrate Two r-xsr receivers ? S-bus in and S-bus out receivers !! wired up ?

[@MrD]

It is the same as in the video. Just take the SBUS out of one of the receivers and connect it to the SBUS IN of the other receiver. You will also need to share the power and ground between the 2 receivers. It doesn’t really matter which receivers you use. Just stick to the basic rules: Master receiver: - must have SBUS IN Slave receivers: - must have SBUS OUT - do not have any stabilisation active

[@georgecarnie546]

Hi Darren, I tried to use a XM+ Rx as a slave to a G-RX8 in a carbon glider. I had the G-RX8 on ACCESS and then found out the XM+ is only ACCST. I tried to flash back to ACCST on the G-RX8 using the STK tool but it doesn't see the RX. I tried with other receivers and STK can connect to those RX's. Is the G-RX8 not backward compatible once you flash ACCESS? BTW - Thanks for a very helpful channel.

[@MrD]

It should be able to be flashed back to ACCST. I’ve flashed an R-XSR from ACCESS to ACCST and back a few times. Have you tried flashing using the transmitter?

[@georgecarnie546]

@@MrD I haven’t. I am using a X12S?

[@MrD]

@@georgecarnie546 that should be fine. I’m not sure if there is an S.Port out on the X12S. But the JR bay method should work.

[@GWCTas]

@@MrD Thanks - No S-port but I'll try the module bay method. I appreciate your prompt reply from the other side of the world!

[@barrybroad3912]

@barrybroad3912 39 minutes ago Hi I have just come across an anomaly between the x20s and the x20 Pro when you select external antenna on x20s it states to put antenna into ant 1 for 2.4ghz but when you select external antenna for 2,4 on the x20 pro its states socket antenna 2? I am making assumption that frsky would have no need to change position of the 868mhz and the 2,4 between the two radios. Could you confirm if this is indeed correct or if there is an error in the firmware between the two.. Regards Barry

[@MrD]

Currently on the X20 Pro. Both external antennas are for 2.4GHz. One for FSK, the other for TW. Internally, the hardware supports an external antenna for 900MHz. I’m hoping that in the future there will be an option in the firmware to say which antenna is for which module. I have actually made the internal hardware change already. I personally don’t see any point for an external FSK antenna. The internal ones work well enough for LOS already.

[@garys3418]

Thanks again!

[@MrD]

Thanks Gary 👍🏻

[@kitchenstrand]

Can you run telemetry on the 900 slave while you are using the 2.4 telemetry…?

[@MrD]

Yes. On ACCST, only the master will send back telemetry. So the 2.4GHz in this case. But on ACCESS, both can send telemetry back.

[@kitchenstrand]

so 900 R MX installed which provides telemetry as indicated by rssi. Green lights all around. When I set the 2.4 to its different model ID, #21, the 900 provides NO servo action on model #20. The SR8 PRO now on mod#21 works. Set it back to 20 and it works. everyting is on the current software. I can disconnect, reset and rebind and the result is the same... @@MrD

[@qroadrunner1996]

Can you help me I’m running a TD SRX18 and want to run an additional TD MX receiver for more protection how can I check to see if it works when the TD SRX18 is disabled?

[@MrD]

The only thing I can think of to check with TD. Is to clear the bind on one of the receivers. The other should take over.

[@ElseysEmpireRacing]

Hi Darren. A new problem, I have an RB-10 connected to an SR8 Pro and a R9MX. The problem is when I unplug the SR8 and re-plug it, the servos all go through an exercise cycle. That would be scary while flying. I substituted the SR8 Pro with an R8 Pro and the problem went away. There is no problem with unplugging and re-plugging the R9MX. I have tried this with both receivers on the same Rx number and different Rx numbers, no cure. I suspect a stabilized receiver is not the best choice with the RB10 . Any insight would be appreciated. Thanks!

[@MrD]

You could have just turned off the stabiliser in the SR8 Pro. You shouldn’t use stabilisers as an input to the RB.

[@ElseysEmpireRacing]

@@MrD But I want the stab function. I see the RB25S has built in stab, guess that is my only option. Too bad FrSky couldn't make the RB units work with Stab Receivers. They don't mention this limitation in any of their literature, unfortunately I just bought two of them. I am rigging a 30cc Ugly Stick, 8 servos, all 200+ oz @ 6V. I'm worried there might not be enough current available from the SR8 Rx without the RB10. Thanks for your reply.

[@MrD]

Yes, currently the RB25S is the smallest option. I don’t know if there’ll be an RB15S in the future. With redundancy in general. Only the master device should have stabiliser functionality enabled. The same is true with receiver redundancy. In the case of RB. The RB unit is the master device, and all the receivers are slaves.

[@ElseysEmpireRacing]

@@MrD I have learned more unfortunately. When using both an X10S Express OpenTX or an X20S Ethos radio. Attempting to use redundancy on a new gas airplane. R8 Pro and R9M receivers, and an RB10 (V171010) The latest firmware on ISRM and V2.1.14 and V1.3.2 on the receivers. Without fail, while all connected and working perfectly, if I unplug R8, re-plug R8, then unplug R9M; The RB10 LED goes red and I lose all control. Then I re-plug R9M and get back control. I tried this with both radios, exact same problem. THEN I switched the R8 Pro with a Archer R6. Problem SOLVED ! I believe there is a FW issue with the R8 Pro. I tried every FW back to V2.1.9, no change. If I eliminate the RB10, the problem goes away. If I try an SR8 Pro, with the “S” turned off, same problem + some of the channels reverse when the R9M is unplugged !!!! Definitely not an option. (It seems the S type receivers have different output directions to standard receivers, regardless whether or not the stab function is on or off, there for not usable in a redundant setup using an RB10 redundancy bus.) All I want is a usable setup for a gas airplane yet I still can't find one. The SR10 Pro if available would likely have bean the answer.

[@MrD]

Thanks for this information Dave. I have forwarded it on to FrSKY. Their technical team will be investigating it. So hopefully there will be a fix in the future. I guess in the meantime, the Archer receiver looks to be the safest option.

[@michaelhollingworth8905]

Hi D. Can you point me in the right direction please. I have a TDR18 that I want to link with a TDR6. Can you please confirm where I should plug-in the SBus connections. IE TDR6 SBus out. Can I assign any 3 pin PWM channel outputs ? / TDR18 SBus in. Can I assign any 3 pin PWM channels ? I looked but could not find one of your KZbin Videos for this. The TD R6 also came with a 6 wired white connector with no connector/s on other 6 wire ends. Would be nice to know what this can be used for ? Many thanks.

[@MrD]

Hi Michel. Yes, on the TD R6, assign one of the PWM ports to be SBUS OUT. Then connect that via a cable to a port assigned to SBUS IN on the TD R18. The white connector can be used for SmartPort, Analogue sensor input 2, and SBUS OUT. To be honest, I only ever really us is for the SmartPort. That can be used to connect sensors or for performing wired updates, if you need to.

[@michaelhollingworth8905]

@@MrD Many thanks D. Your reply is very much appreciated & all sorted now thank you. Have a great Christmas.

[@MrD]

Merry Christmas to you too Michael 👍🏻

[@justinfielding]

Why can't you get telemetry from the backup receiver too?

[@MrD]

The older protocol doesn’t support it. I have another video on the telemetry using redundancy. This shows what can be set up on each protocol.

[@afterburnerrc6333]

Well Darren, to say I am at wit's end would be an understatement. I followed your video to the T and cannot get the redundancy test to work. The only difference is I am using an Archer SR10+ receiver with a R9SX, is there a problem with this combo? As soon as I change the Model ID to check the R9 functionality it doesn't work. The SR10+ has a RED LED and the R9SX has a GREEN LED but no servo movement no matter what port I put the servo in on the SR10+. The crazy thing is the stabilization still works when I move the SR10+ ? So far not a great experience trying to get this redundancy to work. UPDATE, JUST TRIED THIS SETUP USING A SR10 PRO AND IT WORKS NO PROBLEM, ISSUE IS WITH THE ARCHER SR10+?

[@MrD]

I've just tested this, and it works fine. I have set up an SR10+ as the main receiver with the R9 SX as the redundancy receiver. To wire it up, I first register and bind (RX1) the SR10+. Then go in to the receiver options and set Pin1 to SBUS IN (You will need to move all the control pins down 1, as I show in the SR10+ video). Next unplug the SR10+. Then register and bind (RX2) the R9 SX. Go in to it's receiver options and set Pin6 to SBUS. Power down the receivers, then connect from the CH6 pins of the R9 SX to the 1 pins on the SR10+. Power on both receivers, and it all works. I can turn off either the 2.4GHz or 900MHz side of the RF module, and the servo keeps moving. It only stops if I turn off both sides of the RF module, which is obviously going to happen. But, TL;DR. It works fine. It must have been a setup issue you are having with the SR10+.

[@afterburnerrc6333]

@@MrD Hey Darren, really appreciate the response back as I know you are busy as hell keeping noobs like me out of trouble LOL, again thanks! Yeah, your procedure works great as you wrote it and I was able to do this but it does not work if I change the model channel between the two as you describe in the video, that's the issue. Adam Mawz was able to confirm that your procedure as written above is good enough for what I am trying to verify but I was assuming you did the channel change for a specific reason and was concerned that maybe something was wrong with my receiver.

[@MrD]

Changing the receiver channel was just a way of temporarily unbinding the receiver from that model. It’s actually much easier to just disable the 2.4GHz or 900MHz temporarily to test its working. So don’t worry about that. The key thing is setting the pin outs correctly on the receivers for this to work. The SR10+ must have SBUS IN on Pin1. It unfortunately won’t work on any other pin currently.

[@pilotstick2925]

Let’s say I’m using a 6 channel receiver and all the channels are used up .. but I need extra channels can I use redundancy as a way of adding extra channels to use ?

[@MrD]

It’s better to use SBUS out and an SBUS to PWM converter.

[@shurdba]

Mr. D; I want to run two receivers with two redundant backups. Is this possible? I like one system for the right side of the plane and one for the left side.

[@MrD]

With ACCESS, you can only bind 3 receivers. To be honest, I don’t know if there’s a limit on ACCST.

[@shurdba]

@@MrD Okay, I can live with that. I'll stick the rudder and throttle on the side that has the back up. Your videos seem to be the best source to figure out the new tandem system. Would the R9 SX be the best choice to back up the SR8 pro? And if so, can I run a separate power source to the R9 SX? I know this seems like overkill, but this is for a very large and very expensive tug and I feel the need to maximize the system.

[@MrD]

Thanks Steve. You could potentially use a different power source for the redundant receiver. But if the main receiver loses power, you will still lose control as the servos are powered from the master receiver. The master receiver also needs to take the SBUS signal from the redundant receiver and output that to the servos. For such a large and expensive model, have you thought about using the redundancy bus system? Something like the RB30 has 3 receiver connections, dual power redundancy, as well as features like servo overload protection. You may find something like that better. As for the R9 SX. It would work fine. I used it in my demo purely because it had servo plugs for the SBUS connection, which made the demo easier. If this is an ignition engine setup, it may be better to use the R8 Pro as the redundant receiver. Though lots of petrol guys are using R9 for the redundant receiver too, with no issues. You could use any receiver with an SBUS out, so long as it fits your build.

[@shurdba]

@@MrD Thank you for taking the time to reply. Yes, I was looking at the RB20 redundancy bus system. Most guys feel this is the safest way to go. But some point out; "then you're back to a single point of failure". And I have seen one or two bus systems go south. Somehow the idea of having two completely separate systems (switch, battery and RX) for each half of the plane appeals to me. When the X8R were having the electrical noise problem, I was able to get down on one RX when the other RX completely quit. There may be a flaw in my thinking, but this seems like a better idea. Having a 2.4 RX backed up by a 900Mhz Rx on at least one side makes a little more sense to me. Steve

[@MrD]

If the X8R was on a plane with an ignition engine, that would explain the problem. The X8R wasn’t designed for use with ignition engines. Yes, I can see where you’re coming from with regards to the single point of failure. In which case, I’d suggest looking at either the R10 Pro or SR10 Pro as the master receiver. That will give you power redundancy; and is also CDI safe. Then use the R9 MX, or whatever you choose as the redundant receiver, powered buy the R10 Pro. Then you have power and signal redundancy on that side. On the other side, go for your preferred receiver, of course this needs to be a Pro receiver if an ignition engine is used. Also, it’s worth noting that FrSky have Tandem receivers coming out soon. These have the 2.4Ghz and 900MHz receivers in one unit. All Tandem receivers will be ignition engine safe too.

[@randallpatrickc]

On the nose Mr D! Exactly what I was looking for. Can I ask a supplementary qu: I want to use an SR10 Pro and the R9SX as slave - just as you demonstrate - great video! Right now, I just have the ESC BEC feeding the SR10 through the PPM connector. Is there a better way? I see there are two XT30 sockets on the SR. What’s the best way to power the two RXs? I have some 10A Castle BECs. If I swap out the standard servos for some digital ones, the load will go up.

[@MrD]

You only need to power the master receiver, so the SR10 Pro in this case. Just run a cable from the SBUS out of the R9 SX to the SBUS in of the SR10 Pro, with signal, power, and ground. So long as the BEC is enough for all your servos plus some overhead. It should be fine. The XT30 connectors are good for power redundancy. It will use the power source with the highest voltage. Just be sure that however you power the SR10 Pro, that the voltage doesn’t exceed what the servos can handle.

[@frank-vq4mx]

Hello. Setting up the redundancy workers well. In "one "direction only ! If you have mapped some channels into the slave receiver the use of extra channels becomes available. That's great ! If the master receiver goes down the extra mapped channels in the slave receiver will continue to function. However. If the slave receiver goes down the extra channels that were mapped into it will "not" work. Disappointing.

[@MrD]

Yes, thats how it’s designed to work. The master should have all the outputs connected to it. SBUS is not bidirectional, the communication only goes one way.

[@richardklevenhusen3737]

Is this transmitter compatible with DMSS receivers ?

[@MrD]

Not natively. I believe they are JR receivers? Natively it supports ACCST D16 receivers on 2.4GHz and ACCESS receivers on 2.4GHz and 900MHz. I’ve just checked the multi-protocol module site, and it looks like they don’t support DMSS either.

[@richardklevenhusen3737]

@@MrD Thank you for your reply. Yes, It’s JR.