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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › 2.4GHz Rx Installation
01-25-2012 06:54 PM  7 years ago
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Stephen Born

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USA

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2.4GHz Rx Installation
If you are using two satellites or one receiver and one satellite, 60mm of seperation should be used for larger birds. Try to keep the antennas sperated as much as possible.

Another important point is that you should try to keep the antenna wires as straight as possible.

You really want to keep any antennas away from any other electrical wiring – This is most important near ESC power wiring where high currents can induce noise directly into receiver circuitry.

The Spektrum satellite contains not only the antenna but a full blown receiver directly connected to the antenna elements. You will note that the antenna has two elements. These two elements form an antenna called a dipole antenna. One element is connected to the RF input amplifiers [ACTIVE element] and the other is simply connected to the ground plane [GROUND element].

The important thing here is to note that the ACTIVE element is always positioned on the LHS of the satellite Rx.

Below are two pictures where the ACTIVE element of the satellite Rx is the one shielded by the carbon framework.

Below is the correct way for installation of a receiver or satellite. No carbon or wire interference.

Hope this helps anyone out there.
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01-25-2012 07:52 PM  7 years ago
coptercptn

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Mesa AZ. USA

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great infoHome of the "Sea Cobra".....
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01-25-2012 08:04 PM  7 years ago
Stephen Born

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Thanks James. I sure hope it helps.
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01-25-2012 09:47 PM  7 years ago
OneHoof

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Cold Spring, Kentucky

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Good information to know. Thanks for posting.
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01-25-2012 11:25 PM  7 years ago
Rafael23cc

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I may understand the topic you are trying to convey, but I have some additional questions....

1. Wouldn't BOTH antennas be shielded in this installation?

2. How about the "active" side of the antenna on the receiver side? For example am R921X?

Rafael
Keep your feet on the ground, but your eyes on the sky.
Team Heliproz.com
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01-25-2012 11:41 PM  7 years ago
Stephen Born

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Wouldn't BOTH antennas be shielded in this installation?
That is why there is an X on the picture. This is not an acceptable way to mount the receiver / satellite.
How about the "active" side of the antenna on the receiver side? For example am R921X?
How about it? What is the question?

Only one is for signal, and only one is for ground.
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01-26-2012 03:27 PM  7 years ago
datidun

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N Ireland

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I have mine mounted per manual,also have tubing over the wires,are there any faults with this way
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01-26-2012 03:39 PM  7 years ago
Heli 770

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01-26-2012 04:28 PM  7 years ago
datidun

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N Ireland

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Thanx good info,the one picture were you have it mounted to the back of the heli,one of the Antenna wires are right against the carbon frame bottom wire,the other one is pointing up in the air,does that not matter that the bottom antenna wire is blocked out
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01-26-2012 05:06 PM  7 years ago
Stephen Born

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USA

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Even though one is ground and one is active, it is good practice to have both antennas free from all obstruction. This includes carbon frame, tail boom, and any electronics.

NOTE: Please be sure to keep antenna away from esc and esc wires. There is a strong current going through the esc wire which can jump across to the receiver. This could cause the receiver to deviate from its normal purpose.
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01-26-2012 06:51 PM  7 years ago
MXRACERX43

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Hazleton,PA USA

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Great info, and as already stated all contained in this link
http://www.archeli.com.au/forums/sh...ad.php?t=136223
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01-26-2012 09:50 PM  7 years ago
Rafael23cc

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Wouldn't BOTH antennas be shielded in this installation?
That is why there is an X on the picture. This is not an acceptable way to mount the receiver / satellite.
Your answer is based on the fact that the 'active" side of the antenna is blocked. My question is: wouldn't BOTH sides be blocked?

Then you provide a link to this picture and say that is acceptable

So we can block the "ground" side but not the "active" side?
How about the "active" side of the antenna on the receiver side? For example am R921X?
How about it? What is the question?
Only one is for signal, and only one is for ground.
Are you saying that on the receiver that has two cables coming out of its case at 90 degrees to each other, only one antenna is the active antenna? What about dipole configuration?

Rafael
Keep your feet on the ground, but your eyes on the sky.
Team Heliproz.com
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01-26-2012 10:06 PM  7 years ago
Stephen Born

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USA

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Your answer is based on the fact that the 'active" side of the antenna is blocked. My question is: wouldn't BOTH sides be blocked?

Then you provide a link to this picture and say that is acceptable
Rafael23cc, Look at the picture where I wrote "Below is the correct way for installation of a receiver or satellite. No carbon or wire interference."

This is the correct way.

This photo shows my first satellite. Horizontal plane.

This photo shows second satellite. Vertical plane.

This photo shows both satellites. Over 60mm from each, no carbon obstruction.
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01-27-2012 12:30 PM  7 years ago
JWatson

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Mustang, OK

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Very Nice article.

But where did you get this info from?

Jarrett
Jarrett Watson
http://jarrettrc.wordpress.com/
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01-27-2012 01:19 PM  7 years ago
tripergreenfeet

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SA

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The article, linked twice above, was written by a fella named Costas on archeli. He is responsible for testing all Tx & Rx for MAAA approval in Australia. He's an EE and the full bottle on this subject.Logo 550SX, Uvular Logo 600SE, TT E820
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01-27-2012 01:24 PM  7 years ago
datidun

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N Ireland

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Great info,im so glad i read it as this is my first 2.4 system,nobody i know even mentioned it,infact i know a few guys who have all set up wrong,thanx for posting.
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01-27-2012 07:04 PM  7 years ago
JasonJ

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North Idaho

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Are you saying that on the receiver that has two cables coming out of its case at 90 degrees to each other, only one antenna is the active antenna? What about dipole configuration?
The antennas on a receiver that has them configured at 90 degrees are individual monopole antennas. The satellite has a dipole. In effect, such a system actually has three antennas that can receive the signal. Two on the RX and one on the satellite.
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