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HelicopterMain Discussion › Chain link fencing
11-21-2017 09:07 PM  20 days agoPost 1
chaos

rrApprentice

Lenexa Kansas

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Our club is wanting to install a chain link fence safety barrier that is going to be 4 foot tall. Does anyone know if it will inter fear with 2.4 transmission if you were to stand behind the fence while flying Helicopters? Thanks

guaranteed not to rust,bust,collect dust,rip,slip,or tare

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11-21-2017 09:29 PM  20 days agoPost 2
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

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No, we have chain link on flight line and heli pad side . When flying planks pilots stand behind 4’ fence and fly . The heli side has 8’ fence with opening to walk to pad and pilots have been behind fence flying helis and race drones with no issues .

I stole it ,flew it and gave it back ;)

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11-21-2017 09:53 PM  20 days agoPost 3
Pistol Pete

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Seffner, FL

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On a previous job we had an intro to VNA Vector Network Analysis which mainly involved the installation of wi-fi antennas.

*Technically a fence doesn't cause interference but what it does is cause "reflection" and the phase angle and magnitude from it can slightly change the frequency and or add multipath dropout.

Add to that the fact that 2.4GHz is a saturated signal, a 4 foot fence between you and your model can't be great news other than safety.

Its been a long time since I used the wavelenght formula and have my doubts if fence will actually act as a faraday cage depending on wire mesh apertures.

Personally I would advise against it. Have them talk to a network engineer if feasible.

Given Spektrum has a menu for such signal loss, all needed is a telemetry on model to check for dropouts.

YMMV and worst case scenario, the fence will protect you.

* * * * *

EDITED
underlined what others may miss and misinterpretate

~~Enjoying the hobby one flight at a time~~

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11-21-2017 10:00 PM  20 days agoPost 4
EEngineer

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TX

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fence will actually act as a faraday cage depending on wire mesh apetures.
Absolutely no way will it even be close to a faraday cage....

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11-22-2017 12:07 AM  20 days agoPost 5
A&J

rrApprentice

Hudson FL 34667

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I do know that Bob wire fence will interfere with a ZR Enforcer
It look like paper mache coming out the other side

Lets do the time warp againnn !

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11-22-2017 01:37 AM  20 days agoPost 6
dkshema

rrMaster

Cedar Rapids, IA

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I do know that Bob wire fence...
The Wire twins -- Bob and Barb won't bother you. But truly beware of BARBED wire. That will rip your heart out...well, maybe put a hole in your pants leg.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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11-22-2017 01:42 AM  20 days agoPost 7
EEngineer

rrProfessor

TX

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It look like paper mache coming out the other side
LMAO...I hear that....

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11-22-2017 03:44 PM  19 days agoPost 8
GyroFreak

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Orlando Florida ...28N 81W

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Use nylon netting like they use around construction sites. It can't interfere with radios, and it is less damaging to helicopters when it catches a fly-away.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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11-22-2017 04:05 PM  19 days agoPost 9
RM3

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Killeen, Texas - USA

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what about base ball cage netting?... very durable, wont mess with RF and most importantly its very durable to UV, weather and easily replaced.

showing a preference will only get you into trouble, 90% of everything is crap...

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11-22-2017 04:13 PM  19 days agoPost 10
EEngineer

rrProfessor

TX

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You could build a chain link "cage"....with a door for entry....and it wouldn't interfere with the RF.

That a fence might cause such interference is an urban myth...

The other reasons all have merit for those reasons are valid.

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11-22-2017 07:56 PM  19 days agoPost 11
Pistol Pete

rrProfessor

Seffner, FL

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That a fence might cause such interference is an urban myth
A myth coming from RF Engineers. Who would have though they would do such a thing? Bloody bastards!

~~Enjoying the hobby one flight at a time~~

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11-22-2017 08:22 PM  19 days agoPost 12
ICUR1-2

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Ottawa, Ontario

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If my club put up a safety fence that caused more harm than good.
I would simply go back to using the soccer fields.
I once saw a cage, room sized, covered with what looked like chicken size fencing made of copper.
Any ideas ?

spending time, paying attention

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11-22-2017 08:29 PM  19 days agoPost 13
RM3

rrElite Veteran

Killeen, Texas - USA

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from CISCO website concerning 2.4ghz signals:

Here is a list of material impact on signal penetration
-Paper and vinyl walls have little effect on signal penetration.
-Solid and pre-cast concrete walls limit signal penetration to one or two walls without degrading coverage.
-Concrete and concrete block walls limit signal penetration to three or four walls.
-Wood or drywall allows for adequate signal penetration for five or six walls.
-A thick metal wall causes signals to reflect off. This results in poor signal penetration.
-Chain link fence, wire mesh with 1 - 1 1/2" spacing acts as a 1/2" wave that blocks a 2.4 GHz signal.

https://www.cisco.com/c/en/us/suppo...f-problems.html

showing a preference will only get you into trouble, 90% of everything is crap...

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11-22-2017 09:55 PM  19 days agoPost 14
EEngineer

rrProfessor

TX

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A myth coming from RF Engineers.
LOL...Don't quit your day job....

Luv it....see a network analyzer and become an instant expert...lol

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11-22-2017 10:29 PM  19 days agoPost 15
EEngineer

rrProfessor

TX

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RM3, the wavelength at 2.4 GHz is 12.5 cm....so 1/2 wavelength would be 6.25 cm.

1 inch = 2.54 cm.

Also, keep in mind that the elevation angle past such a fence is "over the fence".....unless one stands right up next to the fence.

I've flown by such a fence....and never had a problem before.

How about you?

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11-22-2017 10:44 PM  19 days agoPost 16
EEngineer

rrProfessor

TX

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Pete, didn't you realize that the wavelength of a 2.4 GHz signal is 12.5 cm?.....

It's ok....no big deal....lol

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11-22-2017 11:40 PM  19 days agoPost 17
Pistol Pete

rrProfessor

Seffner, FL

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RM3
Chain link fence, wire mesh with 1 - 1 1/2" spacing acts as a 1/2" wave that blocks a 2.4 GHz signal.
@RM3
Thanks for posting and confirming what I posted as having doubts based on aperture.

Good to know its definitely not an issue. Unless of course Cisco is also propagating a myth.

Now if we could only find a formula to figure out why some people "ignore" numbers keeps getting higher, we could troubleshoot anything.

~~Enjoying the hobby one flight at a time~~

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11-23-2017 12:21 AM  19 days agoPost 18
EEngineer

rrProfessor

TX

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Pete, Cisco RF engineers didn't write that crap.

Their idiot tech writers or website designers did....typos, etc.

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11-23-2017 05:59 PM  18 days agoPost 19
RM3

rrElite Veteran

Killeen, Texas - USA

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I dont know... last time I checked CISCO was one of the leaders in computer network communication on the planet, not some dude on RunRyder...

showing a preference will only get you into trouble, 90% of everything is crap...

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11-23-2017 06:35 PM  18 days agoPost 20
EEngineer

rrProfessor

TX

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Yeah?

Well, I'll bet I'm smarter than any of their techwriters that make stupid errors like this....even on my dumbest day....

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HelicopterMain Discussion › Chain link fencing
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