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Old 06-05-2007, 12:57 AM   #11
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I have two expensive hobbies... RC Airplanes and Amateur Radio... when my wife decides to use her treadmill, all I have left is one... RC Airplanes.. the RF noise from the treadmill obliterates the lower frequency HF bands...'s that for an oxymoron, "...lower frequency High Frequency..."
Kill power on... doors coming open... wings level...clear to drop...
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Old 06-05-2007, 06:42 PM   #12
Norm Nestie
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Originally Posted by Mike Emilio
Any motor with brushes give off a degree of EMI due to the heavy sparking on the commutator. The only resolve with some effect that I know of, would be to put a capacitor across the electric motor. I don't think any fans sold have motor capacitors.

You must have one heck of a strong fan!
Could someone flying a palne with a electrical motor cause interference with other transmitters being used at field?
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Old 06-05-2007, 08:39 PM   #13
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Electric powered planes will not interfere with other aircraft. Yes, there is some noise generated, but it usually does not cause a problem for the receiver in the plane. Rx and motor are only a few inches apart with no problem so I can't see any EMI problems for other aircraft.
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Old 06-05-2007, 08:51 PM   #14
Dave Holmes
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Some points to keep in mind;

- "Noise" as we know it which is generated by motor brushes, metal to metal contact, spark plugs, whatever is all amplitude modulated.

- our systems are usually frequency modulated so any "noise" picked up by the antenna drops out of sight very quickly, as AM cannot be detected by an FM receiver.

- most of our receivers are double conversion, and without getting into a boring and lengthy technical disertation, that offers a bunch more rejection, even though its primary function is to reject signals on adjacent or nearby channels.

- Therefore, any noise coming through and being evidenced as glitching has to be getting into the receiver electronics after the stage which detects the intelligence (the information/data/control signal, call it what you like) and as such either has to be originating from a hugely strong source or be from somewhere quite close.

Dunno if this adds anything useful to the discussion, but I couldn't resist sticking my oar in, and hopefully help a bit.
Dave Holmes

The older I get, the better I used to be!
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Old 06-06-2007, 02:56 PM   #15
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Originally Posted by Norm Nestie
Could someone flying a palne with a electrical motor cause interference with other transmitters being used at field?
Yup, especially if it's a brushed motor and a cap goes bad. The "nice" (?) thing is, the aircraft with the errant motor will be the first to fall from the sky....
MAAC# 12719
Si fractum non sit, noli id reficere - (If it ain't broke, don't fix it).
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Old 06-06-2007, 05:13 PM   #16
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...Got me!!

Hey Den... what if you were brushing yer teeth while testing the plane with an electric toothbrush? Oh forgot... rednecks only got one tooth.
Maybe it's that plate in yer head?
That dang TV you got up in the corner stuck on Jerry Springer everytime I go over there?
Hearing aid put in the wrong end ( vertically)?

Just some ideas...
Hangar Nine SpitFire..Saito.100
Top Flite P51..Saito.91
RCGUYS Decathlon..SPE 26
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