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HomeAircraftHelicopterHelicopter Main Discussion › 2.4 Antennae Length Question
03-18-2015 04:33 PM  3 years agoPost 1
Dee Flies 3D

rrApprentice

Farmington Hls, Mich - USA

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Does anyone know how much the length of the (2) antennae wires matters? [Futaba Style long one with exposed ends] I know it's a micro shielded co-axial wire, and that the 'exposed' end is the important part.

Reason I ask is I was given a 3GX MS controller & wanted to mess around with it. One of the antennae's was damaged, and when I looked inside for possibly replacing it, there's NO room to get it off the socket. There's an IC chip about 0.5mm above it & the (2) boards are soldered together.

I was going to trim away the outer 'sheath', so the length of the inner exposed 'core' is as it should be, BUT the overall length would be about 1/2" shorter than stock.

Will this matter for reception OR is it not a big deal??
450 size machine so it won't be flown at long distances - my eyes ain't THAT good anymore...

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03-18-2015 04:55 PM  3 years agoPost 2
prototype3a

rrApprentice

Christiansburg,VA

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Should be roughly some fraction of the wavelength with a correction factor for the coax of ~0.9 My guess is that it is a 1/4 wavelength antenna which is 1.1875" for 2.4ghz. Corrected, for the coax, that's a little over an inch.

~Drew

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03-18-2015 05:43 PM  3 years agoPost 3
BossieB

rrNovice

Northern Cape, South Africa

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Drew is spot on with the lenght, 30mm or 1.18" for Futaba coax.

Without removing the PCB you need to make up the .5" shortfall
and cut the exposed end to 30mm and sleeve the end portion.

Bossie

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03-18-2015 05:50 PM  3 years agoPost 4
Hamo

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Ireland

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I was going to trim away the outer 'sheath', so the length of the inner exposed 'core' is as it should be, BUT the overall length would be about 1/2" shorter than stock.
You'd be doing the right thing. As long as the inner conductor is the same length as before it will work just as well. The reason for the long coax wire is to give you a wider choice for the position of the antenna ie the exposed length.

Hamo

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03-18-2015 06:17 PM  3 years agoPost 5
Dee Flies 3D

rrApprentice

Farmington Hls, Mich - USA

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Thanks guys.

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03-18-2015 11:41 PM  3 years agoPost 6
Heli_Splatter

rrElite Veteran

USA

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Suggest a good range test before flying...

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