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Old Dec 06, 2012, 10:04 PM
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rcroadtrain's Avatar
Australia, NSW, Marsfield
Joined Feb 2012
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Quote:
Originally Posted by IceWind View Post
Dang... I usually use the snakes rods from gliders to help guide the antenna wires.
what are those rods made out of?
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Old Dec 06, 2012, 10:53 PM
Flying a Chipmunk in Portugal
jhsa's Avatar
NRW, Germany
Joined Sep 2010
3,534 Posts
actually, I have one of the antennas on my easystar running inside the tube for the 35MHz antenna on the bottom of the plane.. Noticed the RSSI going quite low a couple of times.. gotta check that
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Old Dec 06, 2012, 11:35 PM
SemperFi!
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United States, TX, Texarkana
Joined May 2012
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Quote:
Originally Posted by Rotozuk View Post
Some plastic tubes have graphite or metal in them.. You have been warned. use the microwave test (with a cup of water in the microwave.)
So am I looking for the tubes to get hot? That means its acceptable to use with my antenna?
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Old Dec 06, 2012, 11:56 PM
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Australia, NSW, Marsfield
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no, not acceptable.
If the tubes get hot, they are absorbing the radio waves. Not Good.

What you want is tubes that stay cold.
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Old Dec 06, 2012, 11:58 PM
Wait...what?
gbmarsh's Avatar
Canada, BC, Abbotsford
Joined Sep 2010
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Quote:
Originally Posted by BriGuy82 View Post
So am I looking for the tubes to get hot? That means its acceptable to use with my antenna?
Nope, other way around. Hot means it has conductive/RF absorbing material in it.

Cheers,
Geoff
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Old Dec 07, 2012, 12:33 AM
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BriGuy82's Avatar
United States, TX, Texarkana
Joined May 2012
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Quote:
Originally Posted by rcroadtrain View Post
no, not acceptable.
If the tubes get hot, they are absorbing the radio waves. Not Good.

What you want is tubes that stay cold.
Can you reccomend a proven tube that is acceptable?
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Old Dec 07, 2012, 12:47 AM
|Taranis|>|All other Tx's|
scott page's Avatar
United States, WA, Richland
Joined May 2009
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Quote:
Originally Posted by BriGuy82 View Post
Can you reccomend a proven tube that is acceptable?
If you've seen the bulb pipetts used for C.A. -- you've got a source of tubes. Also called C.A. Applicators.
http://www.hobbyking.com/hobbyking/s..._Reg_1pc_.html
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Old Dec 07, 2012, 06:07 AM
throw new IOPilotException();
IceWind's Avatar
Ireland, County Dublin, Dublin
Joined Feb 2005
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Quote:
Originally Posted by rcroadtrain View Post
what are those rods made out of?
They are Plastic.
Example:
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Old Dec 07, 2012, 10:02 PM
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rcroadtrain's Avatar
Australia, NSW, Marsfield
Joined Feb 2012
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try 'antenna tubes' that 1/10 cars/buggies use:
http://www.ebay.com.au/sch/i.html?_t...at=0&_from=R40
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Old Dec 07, 2012, 11:10 PM
60 years of RC flying
Daedalus66's Avatar
Canada, ON, Ottawa
Joined Feb 2006
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Quote:
Originally Posted by BriGuy82 View Post
Can you recommend a proven tube that is acceptable?
Clear plastic is generally OK but it would be well to test.
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Old Dec 08, 2012, 06:50 AM
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Nelapaty's Avatar
Virginia
Joined Sep 2006
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I tested couple of clearplastic tubes last night with the microwave test and no they didnot get warm or hot..
I had some white plastic tubes that came with a plane for antenna wire and boy they were really warm to touch after the microwave test..
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Old Dec 08, 2012, 07:02 AM
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rcroadtrain's Avatar
Australia, NSW, Marsfield
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Quote:
Originally Posted by Nelapaty View Post
I tested couple of clearplastic tubes last night with the microwave test and no they didnot get warm or hot..
I had some white plastic tubes that came with a plane for antenna wire and boy they were really warm to touch after the microwave test..
the white ones got hot?.. hmm.. thats a worry...
as frequency gets higher, attenuation (absorbtion) increases..
what might be ok at 27MHz, could be useless at 2.4GHz..

fortunately, a microwave oven IS 2.4GHz.. making it the best test.
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Old Dec 08, 2012, 08:19 AM
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USA, NH, Alstead
Joined Oct 2007
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Quote:
the white ones got hot?.. hmm.. thats a worry...
as frequency gets higher, attenuation (absorbtion) increases..
what might be ok at 27MHz, could be useless at 2.4GHz..
Ah, so this is why it may be OK to do this with 72 MHz as I have done before but it may not work with 2.4 which in my case it most assuredly did not and almost cost me my quad.
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Old Dec 08, 2012, 08:42 AM
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Australia, NSW, Marsfield
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it might still have a negative effect at 72M, but not as noticable.

same thing happens with coax cable, as the frequency gets higher, the cable absorbs more RF.

one would hope those plastic antenna tubes that get sold for buggies would be 'RF transparent'.
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Old Dec 08, 2012, 09:00 AM
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USA, NH, Alstead
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As someone who is relatively new to 2.4, I have been wondering about the proper position for the antenna. With my 72 system of course the antenna comes straight out of the top of the radio, and based on the way I hold the radio I'd say maybe it is somewhere between horizontal and 30 degrees up from horizontal.

The 2.4 Frsky radio has a "joint" in it that allows it to be more vertical. When I was doing my "range testing" it did seem that a more vertical orientation gave me more range. What gave me a huge amount of additional range in range checking was holding the transmitter at head level.

Anyway, what is the optimum orientation of the antenna with respect to the ground. Does it vary with how high you fly? Does it matter?
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