RC India

My RX600 Rx (came with SD-5G) has two co-axial cables for antenna. The manual states one of the precautions as:
'When installed in an electric-powered model, keep the receiver antenna wires as far away as possible
from the motor, battery, and electronic speed control (ESC)'.

My questions are:
1) How does an electric setup affect the receiver's performance?
2) What to do when you have to use the Rx in a small delta?
3) Can the Rx be somehow shielded from the electronics?

I read somewhere that twisting the motor wires can reduce effective interference, is that a solution?

Hmm...looks like nobody here uses a twin cable Rx...

Most of the full range 2.4Ghz receivers of all brands use twin antennas.  You do not have to sweat this too much, with twin antennas, just mount them oriented at 90 degrees, and usually everything will be fine.  Just see if you can keep the RX antenna away from the ESC if possible, to reduce interference that will show up as glitching. 

If you run into glitching, you will definitely have to try this separation as a one of the first troubleshooting steps.  It is a best practice/guideline that you keep the ESC to receiver wire and the RX antennae away from the ESC to motor wires. Even if it is not strictly followed, chances are that the systems today are fairly resilient to such possibilities.

Just do nothing and check if the link disconnects. If yes, you have to use ferrite beads/rings and pass all Servo + ESC Signal wires through the ferrite beads or rings.

Don't shield Rx (Specially the antenna) , it will block some signal to enter in Rx, but shield the ESC.

But if you use BL Motors specially smaller one, no external sparking and thus huge noise will not be present like brushed motor.

However, for large Electric motor, you have to use ferrite rings for servos & Esc and a separate Rx battery is preferable.

Kalyan - He doesn't have any problems yet ! :)  So for now, just mount the RX and its antennae properly, do a range test and go fly !

Thanks sir, will do that! :)

I have been using the Futaba compatible Orange receivers ( 2.4 GHz) in a couple of electrics without any special precautions, and have had no problems at all. Even the antennae are just shoved, along with the receiver,  into the fuselage with no real orientation. As Kalyan says BL motors do not, usually, cause interference.

Hmm... the manual just says 'electric setup', I should have realized it was only reffering to brushed motors. But a few lines on 'stefanv.com' were making me uneasy. They go: "Although brushless motors don't have a commutator to produce interference-causing sparks, they are not immune from producing interference. There are still high switching frequencies with sharp-edged wave forms involved in the operation of the motor."
Here's the link:
http://www.stefanv.com/rcstuff/qf200406.html

I'm a newbie and didn't want to ruin a costly Rx. Anyways, got the point; BL motors are O.K! :)
 

Saw the Orange receivers' pics. They seem to be only a few inches long. However, the leads on my Sanwa RX600 are like 9 inches long and can't be 'just shoved' as only 'gentle curves' are allowed.

1. Irrespective of the length of the wire, it is only the "exposed" 40mm or so that is the "receiving" portion.

2. By "shoved" I meant that no precaution as to  orientation - 90 degrees or otherwise - has been taken. The antenna wires should not be kinked, that's about it. Beyond that, they can be routed anyway you find suitable for your particular installation. 

Hope this clarifies things!

Hmm...the manual has this warning in bold:
'The Coaxial cables can be mounted parallel to each other, but under no circumstances should the antenna reception wires be mounted parallel to each other.'

Sushil sir, I'm sure you are referring to the coaxial cables and not the reception wires when you say "no precaution as to  orientation", right?

Yes. And they need not be at 90 degrees.

OK everything's clear now, thanks! :)

90 degrees for the end piece that does the actual reception would be best practice, to ensure maximum reception.  There are even special mounting pads available to ensure that close to 90 degrees is ensured.

http://www.rcindia.org/radios-and-receivers/mounting-futaba-fasst-receivers/

I think 'they' in the quote refers to the coaxial cables and not reception wires.

Yep... wanted to remove any ambiguity in that.