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Apr 24, 2012, 06:16 PM
Been modding for over 35 years
wannabe's Avatar
Has anyone ever tried to encase there 5.8 helix in a sort of "radome" enclosure?

I am going to put mine in a plasic egg and wonder if that would have an effect on the antenna...
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Apr 24, 2012, 06:31 PM
Look Sideways at Polarisation
Funky Diver's Avatar
Chucked together an excel spreadsheet to take out the guess work.

Get it here
Apr 24, 2012, 06:34 PM
Look Sideways at Polarisation
Funky Diver's Avatar
Quote:
Originally Posted by wannabe View Post
Has anyone ever tried to encase there 5.8 helix in a sort of "radome" enclosure?

I am going to put mine in a plasic egg and wonder if that would have an effect on the antenna...
I was looking at using plastic shot test tubes... for the active part
Apr 24, 2012, 06:37 PM
Been modding for over 35 years
wannabe's Avatar
Quote:
Originally Posted by Funky Diver View Post
Chucked together an excel spreadsheet to take out the guess work.

Get it here
Awesome !! Thanks for that effort!!

However it needs to be de-bugged. I got a support legnth of 3500.0" or 88900mm. Seems a bit long for 5.8.......
Apr 24, 2012, 06:59 PM
Look Sideways at Polarisation
Funky Diver's Avatar
Quote:
Originally Posted by wannabe View Post
Awesome !! Thanks for that effort!!

However it needs to be de-bugged. I got a support legnth of 3500.0" or 88900mm. Seems a bit long for 5.8.......
Did you put in 5.8 by any chance?

Try changing it to MHz and you should be good

I will change it, but to put a prompt in for the right frequency range lol

edit : amends made
Apr 24, 2012, 07:00 PM
Been modding for over 35 years
wannabe's Avatar
Quote:
Originally Posted by Funky Diver View Post
Did you put in 5.8 by any chance?

Try changing it to MHz and you should be good

I will change it, but to put a prompt in for the right frequency range lol
HA, yeah that was it. I did 5800MHZ and got better results. Thanks!
Apr 25, 2012, 08:14 AM
Always soldering
Hi guys!

I use a plastic toothpick container wich you can screw the cover to transport and then ones on the field you can unscrew that and use your helix without problems.

Off course my helix is only 3 Turns and very little weight for the connector to support.

Please note this original idea is from Lindsay (Pisces) and credits go to him for this simple and easy to get solution for our antennas.: Thanks Lindsay!

The reflector is directly "hot glued" to the bottom of the container.

Pictures attached...

Regards

Martin
Apr 25, 2012, 09:04 AM
Been modding for over 35 years
wannabe's Avatar
Yes but why bother removing the container bottom for use? Why not just leave the plastic cover on?
Apr 25, 2012, 09:54 AM
Engineer for Christ
IBCrazy's Avatar
^The cover will attenuate the signal and detune the antenna. If it were 900MHz, it wouldn't be a problem. 5.8GHz is very sensitive to the environment.

-Alex
Apr 25, 2012, 10:00 AM
Been modding for over 35 years
wannabe's Avatar
Quote:
Originally Posted by IBCrazy View Post
^The cover will attenuate the signal and detune the antenna. If it were 900MHz, it wouldn't be a problem. 5.8GHz is very sensitive to the environment.

-Alex
Okay thanks. What about paint on the active element?
Apr 25, 2012, 01:58 PM
Look Sideways at Polarisation
Funky Diver's Avatar
Quote:
Originally Posted by IBCrazy View Post
If it were 900MHz, it wouldn't be a problem
Apart from the fact that it'd be a dinosaur toothpick container then you'd have to worry about Pterodactyls getting your plane on landing approach
Apr 26, 2012, 04:42 AM
Registered User
Funky Driver,
Thanks for the spreadsheet. You summed up this thing for us... Every thing is clearer now.
But... Can you please explain what you mean with wood and with plastic in the former section.
Do you mean a plastic tube that you also given a link for example?
And wood also...
I am asking these questions because dimensions are changing when I change the material type... I am a little bit confused...
Is this change is related to the former materials conductivity, etc?
Apr 26, 2012, 05:17 AM
Registered User
Answer of my silly question is in the first page...
"Why the different calculations? The PVC former is a dielectric and shifts the frequency down 5% or so"
Sorry all!
Apr 26, 2012, 06:31 AM
Happy Days
mudlark's Avatar
Quote:
Originally Posted by IBCrazy View Post
^The cover will attenuate the signal and detune the antenna. If it were 900MHz, it wouldn't be a problem. 5.8GHz is very sensitive to the environment.

-Alex
Alex
What would happen if you put a 5.8 CL or SP inside a table tennis ball??
Apr 26, 2012, 08:05 AM
Engineer for Christ
IBCrazy's Avatar
It will do fine. I actually recommend this to protect the antenna.

-Alex


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