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Old Nov 23, 2007, 01:40 AM
T-ster is offline
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Mounting Receiver with Velcro


On the old type receivers I would always wrap them in foam and secure them with rubber bands or velcro. With the XPS receiver, do you simply attach sticky back velcro to the receiver and the aircraft? Is that a sturdy enough attachment and provide enough vibration isolation?

If anyone has pics of alternate installations, that would help as well.

Thanks.

Trevor
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Old Nov 23, 2007, 01:49 AM
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I fly only Electric, so don't have to be as concerned with vibration. So indeed I do mount my receivers with Industrial strength Velcro, and then as added security, wrap a Velcro Strap around them.
Last edited by altacom; Nov 23, 2007 at 01:57 AM.
Old Nov 23, 2007, 03:21 AM
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I do it as layers. Bottom is foam glued to the balsa. Next velcro. Next velcro to the receiver. This velcro keeps anything from sliding. Finally, a wrap of velcro with foam between it and the receiver. This wrap is to make sure that the receiver does not slap side to side and is a secondary attachment to the aircraft.

Actually, I do just about everything this way. I believe that all our electronic stuff should be isolated from vibration. I even do this on my larger electric aircraft.
Old Nov 23, 2007, 07:34 AM
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I buy 4 ft packages of industrial grade "Velcro" at Lowes and use it to mount my receivers directly to the floor or a flat area. I experimented with using the foam covering that comes with Hitec receivers by gluing it to the floor of the plane and then the Velcro on top of that. I did not see any added vibration isolation benefits so I have eliminated the foam and now use just the Velcro - which provides vibration isolation but either way will work. My planes range from a Great Planes RV-4 to a Phoenix F22 Tiger Shark and several in between. All are XPS and all use the Velcro attaching method.

I did find that adding some thinned epoxy to the balsa or lite ply area (and let it cure) that I stick the Velcro on (AC side) seems to help provide a better attachment. When you try to remove the receiver from the plane it sometimes brings the mating Velcro with it. If you should experience a crash I seriously doubt that the receiver will depart from where it is attached.

One last thought - this technique sure makes securing your receiver a very simple task.

Howard
Old Nov 23, 2007, 12:13 PM
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filters and finals in a receiver are fragile to vibration and will crack.you make your decision based on what you feel is best for you.me i put foam under them and a small piece of two sided tape to keep it from sliding and then a Velcro strap to hold in in place
Old Nov 23, 2007, 01:30 PM
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We zip tie or velcro our receivers directly to wood - no other cushion.
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Old Nov 24, 2007, 04:07 PM
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Hi Guys

I just velcro because i fly nothing but electric, works for me.
Old Nov 24, 2007, 07:53 PM
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Jim,

So you say the XPS receiver is not succesptible to vibration even if mounted directly to a wooden part of the plane?

Is this because it doesn't have the sensitive components we always worried about in 36/72 MHz rx?

And does this advice aply to all planes, ie gas powered, large scale, no restriction on engine type?

Thanks!
Old Nov 24, 2007, 08:55 PM
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That's what I'm wondering. I don't think I could EVER mount a receiver without some kind of vibration isolation. The idea frankly scares the heck out of me!!
Old Nov 25, 2007, 01:53 AM
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IF i remember right hitec told me it makes no difference on performance whether you pad the receiver or not. The vibrations will transfer through. If i remember right they claimed its just good for some possible crash protection (a.k.a air bag for receivers). I wonder how true. I have always mounted my rx's like Jim does with no problems, weather it be with XPS, Futaba, Spektrum, doesnt matter.
Old Nov 26, 2007, 12:27 AM
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We have never used any type of vibration reducing material for mounting receivers. We most of the time just zip tie them directly to wood. There are no crystals or sensitive components to worry about. The guy that flys our system in the USRA racing pulls 26 g's every corner, so g-force is not an issue either.
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Old Nov 26, 2007, 11:29 AM
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Once again, Jim doesn't know his own system.

The XBee-Pro uses a Freescale MC13193, and this 2.4 GHz transceiver chip of course needs (and has) a 16 MHz crystal reference oscillator. Jim, take a look at the Freescale Documents, or simply open a XBee module. (Hint: a SMT crystal has four pins, it's next to the MC13193)

So it's a very good idea to isolate XPS receivers from vibrations just like any other electronic part.

Joerg
Old Nov 26, 2007, 07:28 PM
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Obviously, I know our product better than anyone. The XBEE does NOT use a crystal. We have a 16MHz oscillator, just like the XBEE units. In both cases, we use coated ceramic resonators, which are not subject to vibrations issues.
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Old Nov 26, 2007, 07:51 PM
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Do your ceramic resonators have better than better than +/-15ppm frequency tolerance and temperature stability?
Old Nov 27, 2007, 10:46 AM
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Yes, our resonators have a +/- 4ppm frequency stability.
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