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Old 05-15-2019, 11:14 AM   #1 (permalink)
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Default What FrSky receivers are you using?

This isn't a "FrSky" forum but seems the nearest proxy here. Which is the best FrSky receiver for larger helis now?


The RX4R looks okay apart from the tiny SBUS/SPort connectors. The X6R looks maybe easier to use.


But really the main objective is reliability vs static buildup and back-EMF from servos.
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Old 05-15-2019, 11:40 AM   #2 (permalink)
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XSR on micros. X4R-SB in 450 to 550. X6R or X8R for 600+. No particular reason to go for the X8R as far as signal stability and reliability, I just like the hard case it has as opposed to the soft case the X4R has when putting it on bigger helis.

At some point I'll move to the R variant of the X8R, the RX8R, for bigger helis. It has the ability to have a redundant receiver which is nice for peace of mind on bigger helis.

Aside from the case style (soft vs hard), there's no reason really to not trust the X4R to even a 700. It has regular servo connectors for S.Bus, the micro connector is only used for Smart Port (telemetry).


All of their X series receivers have excellent signal quality and reliability. If there was a X4R-SB with a hard case I'd use it on a 800 with no concern. It's super compact. That's the only thing I don't like about the X8R... it's got 8 servo ports, and FBL helis only need one...the S.Bus port.
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Old 05-15-2019, 11:41 AM   #3 (permalink)
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I use the RX4R in my 516 and E7. In the B450X I use the R-XSR.

All have given me zero problems.

They can be linked with an XM+ or the like to get redundant receivers, like Spektrum sats. I have not needed them what so ever.

If you do use them and need to connect to a FBL using SBUS, look up OscarLiang.com (iirc) for "uninverted SBUS signal". That saves buying the adaptor required on the brain/iKon. Not Sure if other FBL units need it.

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Old 05-15-2019, 12:36 PM   #4 (permalink)
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Quote:
Originally Posted by Ivan View Post
I use the RX4R in my 516 and E7. In the B450X I use the R-XSR.

All have given me zero problems.

They can be linked with an XM+ or the like to get redundant receivers, like Spektrum sats. I have not needed them what so ever.

If you do use them and need to connect to a FBL using SBUS, look up OscarLiang.com (iirc) for "uninverted SBUS signal". That saves buying the adaptor required on the brain/iKon. Not Sure if other FBL units need it.

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What? I run my X4R-SB straight to my Brain2, no adapter.
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Old 05-15-2019, 02:18 PM   #5 (permalink)
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Quote:
Originally Posted by Number View Post
What? I run my X4R-SB straight to my Brain2, no adapter.
Some FBLs will accept inverted or uninverted, some won't - the Spirit for example needs uninverted.
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Old 05-15-2019, 02:21 PM   #6 (permalink)
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I am gradually moving to FRSky receivers, and currently have

R-XSR on ALZRC X360
XSR on Gaui X3
X4RSB on Tarot 450 Pro
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Old 05-15-2019, 02:25 PM   #7 (permalink)
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Quote:
Originally Posted by Mikej View Post
Some FBLs will accept inverted or uninverted, some won't - the Spirit for example needs uninverted.
Interesting. Didn't know that
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Old 05-15-2019, 02:37 PM   #8 (permalink)
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The original Spirit requires uninverted SBUS; the Pro and micro variants are happy with inverted.

I've been using the X4RSB with two helis; no problem on the 380 or 520, but then I put one on the 600 and this happened (it seems just because I didn't ground the boom, so it may just be coincidence that it happened when I switched radio brand).

Thanks for the advice; I guess I'll get a pair of X6Rs then.
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Old 05-15-2019, 02:42 PM   #9 (permalink)
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Actually, just to confirm. The "standard" Spirit needs the inverter cable, the micro Spirit and Spirit Pro use a direct cable.


Spirit
When using S-BUS it is necessary to use an inverter that replaces the cable between the receiver and the Spirit unit's RUD port. The inverter cable - called SBUS Adapter - can be purchased separately. The SBUS Adapter has to be connected in the way, that longer end is directed to the unit and shorter to the receiver. This apply for both Futaba and FrSky receivers.

Spirit Pro and μSpirit
Connect the receiver with the unit by normal patch cable to the RUD port. You can use cable that is included in the package.

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Old 05-15-2019, 02:42 PM   #10 (permalink)
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Quote:
Originally Posted by cycled View Post
The original Spirit requires uninverted SBUS; the Pro and micro variants are happy with inverted.
You beat me to it
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Old 05-15-2019, 03:20 PM   #11 (permalink)
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Default Standard S-BUS is inverted by design

Once again...

The standard S-BUS signal (invented by Futaba) is an inverted signal by design. All S-BUS capable FrSky X-series Rxs adhere to this standard inverted S-BUS signal. Like Number, I just plug mine right into a ICON (Oxy 2) and more recently, into a Tarot ZYX-S2 FBL (Rotorscale 450) using a regular old servo cable. No fuss, no muss.

The drone guys buggered up the nomenclature because the first flight controllers (and evidently the non-Pro Spirits?) require a non-inverted, non-standard SBUS signal, which requires a special cable - this was the origin of all the ignorance/confusion which persists to this day.

All that said, I only just started flying non-BNFs and have employed the X4R-SB on my Oxy 2 and Rotorscale 450. I think I'll be going with the redundant versions (either the RX4R and/or RSXR) paired up with an XM+ as backup for my helis larger than a 450.
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Old 05-15-2019, 04:10 PM   #12 (permalink)
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Quote:
Originally Posted by ridge-runner View Post
Once again...



The standard S-BUS signal (invented by Futaba) is an inverted signal by design. All S-BUS capable FrSky X-series Rxs adhere to this standard inverted S-BUS signal. Like Number, I just plug mine right into a ICON (Oxy 2) and more recently, into a Tarot ZYX-S2 FBL (Rotorscale 450) using a regular old servo cable. No fuss, no muss.



The drone guys buggered up the nomenclature because the first flight controllers (and evidently the non-Pro Spirits?) require a non-inverted, non-standard SBUS signal, which requires a special cable - this was the origin of all the ignorance/confusion which persists to this day.



All that said, I only just started flying non-BNFs and have employed the X4R-SB on my Oxy 2 and Rotorscale 450. I think I'll be going with the redundant versions (either the RX4R and/or RSXR) paired up with an XM+ as backup for my helis larger than a 450.
If I understand this correctly, you're probably not using S.port telemetry. In order to use SBUS and S.port, you tap the uninverted SBUS signal (or inverted or whatever) and run that to one of the sat ports. The s.port signal goes to the channel 4-5-6 port.

I have used SBUS on the iKON by calling it a Futaba (ewwwwww) reciever and running the SBUS directly to the 4-5-6 port. It does work. No inversion needed. But, it kills the ability to have telemetry through the iKon. On FrSky recievers, it would be possible to use external sensors to capture telemetry and just use logs to look at iKon stuff.

I think that's maybe what you're saying??? Possibly???

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Old 05-15-2019, 04:22 PM   #13 (permalink)
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i use, have used

x4r-sb
r-xsr - on oxy 2 right now
r-x4r
r-x6r
xm+

d4r-ii
d8r
l9r
r9-mini

i typically use x4r's on my helis
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Old 05-15-2019, 06:11 PM   #14 (permalink)
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Quote:
Originally Posted by Ivan View Post
If I understand this correctly, you're probably not using S.port telemetry. ...
Yes, I am not running any S.Port telemetry from the ICON to the Rx. I'm simply using the S-BUS connection to send 16 channels of output from the Rx to the FBL.
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Old 05-15-2019, 07:01 PM   #15 (permalink)
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I use the X4R-SB on everything from a 360 to 700. No problems.
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Old 05-15-2019, 07:35 PM   #16 (permalink)
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Quote:
Originally Posted by Hydros27 View Post
I use the X4R-SB on everything from a 360 to 700. No problems.
I do the same. I think I have a X6R on one of my helis, just because I had it sitting around.
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Old 05-15-2019, 10:17 PM   #17 (permalink)
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Mostly x4r-sb with two exceptions. Have a xm+ on my Goblin 280 and a RX8RPRO on a Goblin 700 gasser.
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Old 05-16-2019, 08:10 AM   #18 (permalink)
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x4r-sb all around. Simplest to wire.

I also use Brain all around, so no inverter or anything.
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Old 05-18-2019, 04:58 PM   #19 (permalink)
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X4R on X3
X6R on Trex 550
D4R-11 on Trex 450
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Old 05-18-2019, 09:46 PM   #20 (permalink)
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using frsky on large models should be avoided
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