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X4r-SB with Taranis X9D signal strength query
#1
Hi guys,

As the title says, I would like to ask what is an acceptable signal strength (RSSI) between X4r-SB and Taranis X9D? 
I ask this because my setup shows RSSI of 78-83 when I power up both rx and tx (distance of 1-2 meters). 
When I fly at an open field, signal at 50 meters is about 70-85, 
at 50-100 meters about 60-75, 
beyond 100 meters signal moves to 50-65 range.

My background with flying Frsky rx started with an old X8R with broken antenna (loads of fly-away anxiety, which did happen). I finally got my hands on a new X4r rx but I dont know what is the normal signal strength between Frsky, tx and rx. 
I get worried when RSSI range falls into 50-60 range so I just gauge visually when I reach 70-100 meters and turn back (I use RSSI call out function on my Taranis) 

So I want to know the following:
1. Is it normal that when I power up both tx and rx with 1-2 meter distance, RSSI reads 78-83?
2. Is it normal that at 100 meters RSSI range is in 50-60 range?
3. Can I fly at 30-50 RSSI or would I lose control below 40?
4. I see videos of other x9d-x4rsb users going 1km+ with stock setup (like mine, no booster).. HOW? And what RSSI signal are the seeing at 1km?

I fly a DALRC XR215 race quad, SP3 FC acro, 4s. My antenna setup on the quad is standard among racers (heat-shrink to zip-tie, with exposed tip clear from frame, 90 deg apart.

I use a 200mw ts5823 vtx and is right next to the x4r-sb rx. Is this a significant issue? I also troubleshoot by moving the vtx away from rx but the vtx antenna still quite close with the x4r-sb rx and still get the same issue/result.

Ill post photos if needed (currently at work)

Any input is highly appreciated! Thanks

-Paul
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#2
a meter is about 3.2 feet right? i use a x4r-sb on 2 of my quads. I also have a d4r-ll another one, and x8r on a 650 drone. and when ever I power both my tx and rx my signal strength reads between 75 and 80 on all of them even they are right next to each other. I usually fly at a soccer field, where I'm at one end and fly to the other end without any warnings. I'll get a low signal warning every once in a great while but I think it usually happens when I get to carried away and gain to much altitude. I try not to fly to far away cause 80% of time I end up doing the walk of shame looking for my quad. lol
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#3
Yes it's normal that you get very low signal when too close... in fact I even lost signal when the TX/RX are placed too closed together.

As long as your TX doesn't shout "signal low" at you you should be fine. with the X4R and Taranis, I get about 1KM - 1.5KM range on the open.
Don't be a LOS'er, be an FPV'er :)  My Gear - Facebook - Instagram - Twitter
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#4
(01-Jun-2016, 03:11 PM)Oscar Wrote: Yes it's normal that you get very low signal when too close... in fact I even lost signal when the TX/RX are placed too closed together.

As long as your TX doesn't shout "signal low" at you you should be fine. with the X4R and Taranis, I get about 1KM - 1.5KM range on the open.

Thanks Jimmy and Oscar.

Big fan Oscar! I learned a lot from you and read you blogs always! lol

What RSSI signal are you getting at 1-1.5 km?
Also, would signal drop a lot when flying at a city park (smack center of central business district) many cell towers, wifi antennas?

Thanks!
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#5
(02-Jun-2016, 05:54 AM)paullex Wrote: Thanks Jimmy and Oscar.

Big fan Oscar! I learned a lot from you and read you blogs always! lol

What RSSI signal are you getting at 1-1.5 km?
Also, would signal drop a lot when flying at a city park (smack center of central business district) many cell towers, wifi antennas?

Thanks!

Thanks Smile
I don't check RSSI, when I heard the lady voice shouting "signal low" and "critical" but i think that happens rssi must be around 35 or 40?
Don't be a LOS'er, be an FPV'er :)  My Gear - Facebook - Instagram - Twitter
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#6
Hello all, 
I have got similar experience as Paullex. With my Taranis and X4RSB receiver (FW cppm_EU) I'm not able to reach factory specified range of 1,5km. I'm getting low signal warning at 300-400m, critical signal at 600m and everything above 800m = crash. 
When I perform Range test I can go to about 60-70m to loose the signal - so it should be fine. 
I tested more different firmwares for transmitter and receiver.
I bought 5dBi antenna kit for transmitter (it helps about 10-15%). 
I tested everything also without VTX, different antennas orientation/position...
I moved receiver antennas under the frame to get them as remote from VTX as possible:
[Image: XAuw0o2l.jpg]

Nothing has really big influence on Range. I have fould, that sometimes is internal module in Transmitter kind of fried, but then is Range by Range-test only couple of meters.

I'm using Taranis also on normal planes (2,6m Scale plane, 1,7kg Hotliner ...). But with problems I'm facing, I have a fear to fly them.

Any idea is appreciated. 

KENNY
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#7
Hi Kenny, welcome to the forum,

If the white tubes at the front of the white 3D printed tray are your RX antenna there is a very good chance the carbon fibre frame and the lipo slung underneath is likely the cause of your signal degradation.

As you are flying a FPV race style quad a range of 600 metres is pretty good when you factor in battery life vs flight times. Your planes are most likely foamies or plastic and thus not cause you such problems. Carbon fibre and placement of antennas is a bit of a juggling act at times.

Other things, like power lines, cell phone towers and even the ground itself can influence radio signals.
My youtube channel

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#8
Hi BigglessFPV, 
Thanks for reply.
I was flying common antenna position/orientation for more than a year, but I found that this position give me a litte bit better signal stability (in term of quad position/orientation). 
I know that antennas are close to Carbon Frame, but they have got shielding (grey cable), active tips are under red heat shrink on zip ties approx. under front motors. I thought that shielding can take care of "Carbon influence". I can build everything in 3D-printed frame to reduce influence of Carbon frame.


I know that carbon is a problematic material for RC, but on my Finist :

(light plywood frame) I have got at 500m RSSI about 50-55 (Receiver X8R). And that's not a much.
Foamies aren't problem because of my bad eyes :-)

I'm flying open space (aitfield) and I'm not aware of strong wireless devices in the near.
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#9
I'm actually having the same issue. I'm getting the critical warning at just 100m away. This is the first time it's happening at the same location I always fly at. I used to have a D4R and now I'm using an X4rSB. Any ideas?
Multirotor Maniac
Website => http://fpvfrenzy.com
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