metal to metal contact causing interference question
#1
Junior Member
Thread Starter
Join Date: Jan 2005
Location: Cape Town, SOUTH AFRICA
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
metal to metal contact causing interference question
If metal to metal contact friction causes radio interference then why do all RC things with a internal combustion engines not have problems with interference as the biggest metal on metal friction is the piston,cylinder and crank?
#2
My Feedback: (1)
RE: metal to metal contact causing interference question
It's not the friction that causes the problem it's the metal to metal vibration that causes the problems such as metal pushrods on a metal carb link arm. Also, problems can be created with metal pushrods that run parallel to the antenna within the fuselage behind the servo's.
#3
My Feedback: (32)
RE: metal to metal contact causing interference question
ORIGINAL: f650
If metal to metal contact friction causes radio interference then why do all RC things with a internal combustion engines not have problems with interference as the biggest metal on metal friction is the piston,cylinder and crank?
If metal to metal contact friction causes radio interference then why do all RC things with a internal combustion engines not have problems with interference as the biggest metal on metal friction is the piston,cylinder and crank?
In the gas engine (not nitro) part of this hobby, it's more important to keep everything connected to the receiver as far away as possbile from the engine and electronic ignition if it has one.
Glow engines are self supporting so they need no outside ignition source so the distance between it and the receiver does not need to be as far as gas.
#4
My Feedback: (32)
RE: metal to metal contact causing interference question
ORIGINAL: dicksoucy
Also, problems can be created with metal pushrods that run parallel to the antenna within the fuselage behind the servo's.
Also, problems can be created with metal pushrods that run parallel to the antenna within the fuselage behind the servo's.
#5
Senior Member
Join Date: Jul 2002
Location: Spartanburg,
SC
Posts: 3,770
Likes: 0
Received 0 Likes
on
0 Posts
RE: metal to metal contact causing interference question
It's not the friction, and it's not the contact, that causes interference. It's the making and breaking of the contact.
Dr.1
Dr.1
#6
Senior Member
My Feedback: (4)
Join Date: Jan 2005
Location: Madison, AL
Posts: 2,141
Likes: 0
Received 0 Likes
on
0 Posts
RE: metal to metal contact causing interference question
i have a metal control horn that i had to drill out the nylon part, and i have the metal pushrod going through because i am using and L bend, will this be a problem?
#8
My Feedback: (32)
RE: metal to metal contact causing interference question
ORIGINAL: Pilot Chad
i have a metal control horn that i had to drill out the nylon part, and i have the metal pushrod going through because i am using and L bend, will this be a problem?
i have a metal control horn that i had to drill out the nylon part, and i have the metal pushrod going through because i am using and L bend, will this be a problem?
#9
Senior Member
Join Date: Jun 2004
Location: Deep River, ON, CANADA
Posts: 3,299
Likes: 0
Received 1 Like
on
1 Post
RE: metal to metal contact causing interference question
The problem is created by sparking from intermittent metal-to-metal contact, particularly intermittent contact of dissimilar metals (brass & steel, for example). The engine vibration will make loose-fitting parts like clevises vibrate, causing sparking -- & producing weak broad-band radio interference. It is real & it is unpredictable, but under particular circumstances it can kill your model. It is most dangerous if the vibrating parts are in proximity to the antenna.
Engine components are normally tight fitting and insulated by a lubricant film -- no sparking. However, a muffler that is vibrating loose can also cause the same problem, although the muffler is not normally located near the antenna.
Engine components are normally tight fitting and insulated by a lubricant film -- no sparking. However, a muffler that is vibrating loose can also cause the same problem, although the muffler is not normally located near the antenna.
#10
My Feedback: (1)
RE: metal to metal contact causing interference question
The problem with vibration generated RF is that you will never know what resonant frequency it is generated at and, of course, what the harmonics are unless you know the frequency.. thus back to the beginning of this sentence.
So, if you do have inteference, and the fundamental is around 72 MHz (for those that are using 72 MHz RC radios), that frequency could generate an inteference level high enough to cause garbled reception in the receiver (from the transmitter) which causes the receiver to glitch. Even harmonics, if high enough in level, can cause a problem.
So, it's best to avoid metal to metal, and easy enough to do.
DS.
So, if you do have inteference, and the fundamental is around 72 MHz (for those that are using 72 MHz RC radios), that frequency could generate an inteference level high enough to cause garbled reception in the receiver (from the transmitter) which causes the receiver to glitch. Even harmonics, if high enough in level, can cause a problem.
So, it's best to avoid metal to metal, and easy enough to do.
DS.