Technical, Techniques, Hints, and Tips > Radio Equipment

Re: Receiver aerial setting

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steamboat66:
always get the antennae as high as possible. i'm building a springer, (far to slowly), and the receiver will be in the wheel house roof! this will enable me to get the antennae somewhere up the mast. also be aware of the fresnel effect, (google it). even with line of sight, the ground (water) can get in the way of the signal when the receiver is far enough away.

hullmanhunter:

--- Quote from: Buccaneer on May 01, 2018, 04:48:58 pm ---I have a Futaba system in which the Receiver has two antenna which go at 90 degrees. I mount it as high as possible inside the superstructure (I make Tugs and Cargo Boats) with one antenna horizontal, i.e. parallel to the water, and one pointing straight up. This one sticks out and is mounted inside a short length of 1.5mm brass tube. This can easily be painted to look part of the ship.
John

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So the signal will pass through brass tube? It should be fine inside a fibreglass hull then.?

malcolmfrary:

--- Quote from: hullmanhunter on May 01, 2018, 07:07:36 pm ---
So the signal will pass through brass tube? It should be fine inside a fibreglass hull then.?

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It will only work accidentally if the end section of the receiver aerial is hidden inside a metal tube.  2G4 signals will pass through almost anything non conducting like fibreglass.  There has to be clear line of sight between the transmitter and the end one and a bit inches of the receiver antenna since that is the bit that does the receiving.  The rest of the lead just carries the signal to the receiver.
The Futaba mentioned is probably running on just the horizontal one.

hullmanhunter:

--- Quote from: malcolmfrary on May 02, 2018, 09:17:22 am ---It will only work accidentally if the end section of the receiver aerial is hidden inside a metal tube.  2G4 signals will pass through almost anything non conducting like fibreglass.  There has to be clear line of sight between the transmitter and the end one and a bit inches of the receiver antenna since that is the bit that does the receiving.  The rest of the lead just carries the signal to the receiver.
The Futaba mentioned is probably running on just the horizontal one.
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Thanks that's very clear. Perhaps the best thing would be to do a range test anyway.
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Buccaneer:
Interesting comment from malcolmfrary. I will give my boats a good looking at next time I'm in the Boathouse and see exactly what I've done.
John

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