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HomeAircraftHelicopterHelicopter Main Discussion › Flybarless Receiver Satellites
08-26-2013 06:16 AM  5 years agoPost 1
PPBAL

rrApprentice

ca

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I have a Mini-Vbar FBL controller installed on my Align Trex 550e V2. Can I use one DSMX receiver satellite instead of two? What will happen if only one satellite is installed? Please advise what is recommended for peace of mind. Thank you and I appreciate your replies.

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08-26-2013 06:25 AM  5 years agoPost 2
RAK402

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Alhambra, CA

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You need two receivers on anything larger than a 450.

This is not a range issue, it is due to the possibility of "shadowing."

2.4g is "Line-of-site." If an object capable of blocking the RF signal gets between the receiver on the helicopter and the source of that signal (the transmitter), the signal will be interrupted. Things that can block the signal are CF, masses of metal (motor, aluminum frame parts, batteries, etc.).

The mass of metal and CF on a 550 is easily large enough to cause shadowing.

If the signal is interrupted long enough, the receiver will lock out and go into fail safe. It will stay that way until the signal is re-acquired. This can happen with the helicopter relatively close in.

People often mistake this for "brown-outs" which are voltage related and have nothing to do with shadowing.

Aside from that, the small cables for the satellites are known to fail occasionally (I have had it happen twice). I have also now seen a defective/intermittent satellite.

For both of these reasons, a second satellite is necessary (and very cheap insurance).

As a side note, I have a good friend who had only one satellite on his 450. The helicopter backed into him in a hover and hit him in the arm. I took the machine home and went through it, and test flew it. The problem was traced back to an intermittent satellite. My friend was lucky that only his arm that was bruised. He could have been injured, seriously.

Team KBDD/Compass Team Manger/Experience RC/Team JR Americas/WR Field Rep

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08-26-2013 11:55 AM  5 years agoPost 3
Rob43

rrKey Veteran

Midland, MI USA

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I am not trusting of a single sat on a 450 either, for just the example you noted, RAK. We fly our helis through crazy orientations. I much prefer one sat positioned away from CF, behind the pod, and, if possible, one away from CF under the canopy. The fiberglass seems to be transparent to the waves, vs CF which definitely isn't. The arrangement has worked well for me for several years now.

Rob

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08-26-2013 05:13 PM  5 years agoPost 4
RAK402

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Alhambra, CA

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" I much prefer one sat positioned away from CF, behind the pod, and, if possible, one away from CF under the canopy. "

Me too, Rob!

I put them at opposite ends of the machine as well!

Team KBDD/Compass Team Manger/Experience RC/Team JR Americas/WR Field Rep

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08-26-2013 07:40 PM  5 years agoPost 5
Luvmyhelis

rrApprentice

Spokane, Washington. USA

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Yeah, def two sats. No argument. Especially on a 550. I have lost dsmx sat reception recently on a very expensive Warp prototype I built. Turns out it was the cable! Cost me a crash and I was lucky it didn't hit the RC pilots gathered in our setup area as it flew down barely a dozen feet over their heads in a 60mph dive. The Skookum self level fail save kept it from totally going out of whack. I fly with one sat out on the boom strut support out back or even on the boom (Of my Goblins) plus one forward on anything over a 250 now.

Old cranky heli builder

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08-26-2013 08:27 PM  5 years agoPost 6
Stephen Born

rrElite Veteran

USA

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Can I use one DSMX receiver satellite instead of two?
Use two satellites if larger than a 450 class.
Please advise what is recommended for peace of mind.
Here is additional information that will assist you.

1) Make sure there is a distant of at least 60 mm between the two.

2) Make sure the satellites are 90° of one another.

3) Check your satellite connector wires. If they are loose or frayed, replace.

4) Keep the antenna wires as straight as possible.

5) Keep any antennas away from any other electrical wiring (ESC)

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08-26-2013 10:04 PM  5 years agoPost 7
qraptor

rrApprentice

Illinois

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Some heat shrink on the antenna wires may help to keep them straight. At the GHz wavelengths, even small changes in antenna length can affect signal reception.

And ideally, both antenna wires should be visible to the receiver,not just the "active" one.

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