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redundant radio systems

Old 03-08-2004, 11:02 PM
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roydefiant
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Default redundant radio systems

looking for links on redundant radio systems for giant scale application. Any help appreciated.
Old 03-09-2004, 08:31 AM
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wingburner
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Default RE: redundant radio systems

Check out www.duralitebatteries.com They have redundant systems and also a powerbox system which I bought.I think you'll find what your looking for.I believe there is a company called powerflite also with redundant systems.

Jack
Old 03-09-2004, 09:36 AM
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mglavin
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Default RE: redundant radio systems

Are you looking for redundant battery/power supply or redundant RX systems?
Old 03-09-2004, 10:15 AM
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apteryx
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Default RE: redundant radio systems

I would think what you want is redundant battery systems (definitely) and redundant connectors/switches (maybe). I believe the radios are pretty reliable.

In fact, two battery packs dot ORed together with diodes would be cheap and effective with only a small voltage loss across the diode.
You could also solder a diode across each cell which might save your plane if a cell opens up in flight.
Old 03-09-2004, 07:32 PM
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Lynx
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Default RE: redundant radio systems

I think redundant radio systems would mean redundant radio systems.... IE RX redundancy. Is that redundant enough? =) Yes, I know I'm an ass.
Old 03-09-2004, 08:26 PM
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JoeAirPort
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Default RE: redundant radio systems

How about split them completely. Two of everything. Split the plane in half. You loose one side and the other is still working (unless you get shot down and both receivers get hit, because of same frequency).

The rudder and throttle could not be split.

Joe
Old 03-10-2004, 10:52 AM
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roydefiant
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Default RE: redundant radio systems

I am actually interested in both concepts, redundant receivers and redundant batteries. I currently use I4C isolators on my large scale airplanes with back up batteries for the servos but not the receiver. The advantage here is that voltage drops that might occur with operation of multiple servos will not affect the receiver. I currently use a single receiver but I am aware that some of the 3D and tournament flyers use two receivers with crossover for ailerons and elevators (if you lose a receiver you operate aileron on one side and elevator on opposite side and one rudder servo continues to operate. Sometime ago I did find a link on the internet that reviewed all these options.
Old 03-11-2004, 12:15 AM
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mglavin
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Default RE: redundant radio systems

Roy

I have several 40% models with dual RX systems in use, together with redundant power supplies. Sounds like you have the basic concept well in hand. Each halve of the model is setup with an RX and its own battery and switch creating redundancy. To further the concept I'm using Lithium-Ion batteries which offers redundant power in of themselves. Each RX and battery is wired with two pairs of two cells in series-parallel or 2S2P configuration. If one pair of cells fails the second will still provide power to the flight system thereof.

I'm familiar with and have utilized the i4c Isolator in the past, good product.

I'm currently rigging my models with servo interfaces. One RX or two (same idea as utilizing two RX's but dual redundant power supplies to both RX's and lots more).

[link=http://www.rc-electronic.com/html/englisch/englisch.html]Emcotec DPSI RV [/link]

[link=http://www.powerbox-systems.com/e/highlights/power_box_40-24_comp.htm]Modelbau Powerbox[/link]

Emcotec is finalizing a new product know as the TWIN DPSI RV, this unit offers dual RX redundancy and more.

If you have any specific needs or questions fire away, we'll all try to fill you in.
Old 03-11-2004, 10:58 PM
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roydefiant
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Default RE: redundant radio systems

Mike, thanks for your reply. The links were helpful. Seems like these planes just keep getting bigger and more expensive and I don't want to lose one. Roy
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Old 03-12-2004, 07:29 PM
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Forgues Research
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Default RE: redundant radio systems

ORIGINAL: roydefiant

looking for links on redundant radio systems for giant scale application. Any help appreciated.

Here is a true redundent system and not just redundent power.
Old 03-12-2004, 07:56 PM
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Phil Cole
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Default RE: redundant radio systems

Roger,

How does the redundant decoder decide that the signal from one receiver is bad?. It look like there is one unit per servo channel.

If a receiver fails (through interference or component failure), it will most likely go into hold or failsafe. Either condition will produce valid servo signals, so it's a bit hard to decide which is the good receiver unless you do something like set the failsafe from the receiver outside the normal servo position limits. If you do this for each servo channel, and both receivers fail due to broadband interference then they'll both go into the out-of-limit failsafe condition, giving the redundant decoder no choice but to drive the servo hard over. To avoid this, you would have to individually program each decoder to hold, or go to an in-range failsafe position.
Old 03-12-2004, 08:14 PM
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mr_matt
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Default RE: redundant radio systems

Hi Phil,

THis was all hashed out last year. Unless they have changed something it is all here:

http://www.rcuniverse.com/forum/m_83.../tm.htm#837126
Old 03-12-2004, 08:43 PM
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Default RE: redundant radio systems

OOPS forgot this was the same thread!!

These switch on failsafe, too bad they are only 8 channels
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