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HelicopterMain Discussion › Antenna tied to boom supports
03-28-2005 10:04 PM  13 years agoPost 21
rmschmidt

rrApprentice

Tooele, Utah

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If you know anything about radio's, running in down the boom support will not cause you to loose range. I have done this for over 15 years with planes and now with my heli. If anything I get a stronger sig. Just run it thru fuel tube and not direct to the boom.

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03-28-2005 10:59 PM  13 years agoPost 22
Lock-Tite

rrVeteran

Quebec, Canada

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Wave lenght ?
Corrections :

I prefer full lenght wire antennas over fractions of it like Base Loaded Antenna wich are considerably shorter.
IMO it is easier for a full lenght antenna to pick up signals.

The lenght of a wire antenna of the a receiver is exactly 1/4 wave lenght for 72-75Mhz and it measures 37 inches, so if you use a much shorter antenna (BLA's) wich is approx 4 to 6 times shorter the reception is therefore reduced.

( Wave Lenght = 936 / Freq in Mhz ( 984 / 72Mhz ) = 13 feet = 156 inches. )

So what advantages have BLA's other than being smaller/shorter ?
Is there a coil in the base that provides a gain ? (DB Gain)

Also I have heard that Airplane guys like the antenna to hang outside of the airplane rather than inside even if the plane's material is wood or balsan, it seams like the range is reduced when the antenna is inside does it ?

Frank
Dont forget to bring a clean pair of shorts when flying 3D ;)

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03-29-2005 01:43 PM  13 years agoPost 23
wleew

rrNovice

Pittsburgh, Pa.

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Leif, YOur correct in your answer. But we can carry this one step further. I didnt bring up verticle and horizontal polarization of the receiving and transmitting antennas. Example: Look at commercial broadcast antennas. Here in the states, tv is horizontally polarized, both receiver and transmitter. In England, their vertically polarizied. Now, horizontal is less suspect from outside noise interferance. Thats way tv is horizontal. Am and Fm commercial antennas are verticle to accomodate design. Can you see cars running around with horizontal antennas. Also, you'll see both receive and transmitt ALWAYS mounted in the same sense so they can talk to each with less signal dropout... Your rc transmitter is more or less verticle and so should the receive antenna for maximum siganl. There is disparity here again for design accomodations. There is a definite drop in db signal strength between opposite polarizations. I am using revo verticle antennas and their vertically mounted. There are no perfect solutions, just compromises. And in closing,I run the wire antennas inside of my fuselages and their horizontal of course on my planes. 73, Lee
Wheres theres lead, theres luck

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03-29-2005 01:48 PM  13 years agoPost 24
wleew

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Pittsburgh, Pa.

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Another truism, it can be argued that a longer wire antenna has more "capture" area over the "loaded" short antenna. The shorter antenna will always have a coil/ cap combo to fool the whip into thinking its a quarter wave antenna. Thus the loading!!!
Wheres theres lead, theres luck!

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03-29-2005 02:05 PM  13 years agoPost 25
Leif

rrElite Veteran

USA

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Yup on the polarization stuff.

However, when I fly my TX antenna is closer to horizontal than vertical. Also, the heli orientation relative to the TX antenna changes drastically during any aerobatic flight, so this becomes less of an issue.

In general, I find that both the full length antenna improperly routed and the base-loaded antenna oriented in ANY direction will work properly out to a range of 500 meters assuming that the rest of your equipment is working properly.

It's only when you have some RF interference or other radio problems that the full gain of the antenna is needed to maintain control. The range check procedure we use tests using the least optimum gain, at least as far as the TX goes.

Leif

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03-29-2005 03:11 PM  13 years agoPost 26
Drunk Monk

rrProfessor

Preston, UK

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I've always run mine up the boom support, just make sure you don't wrap it around them.


Stephen

I only open my mouth to change feet.....

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03-29-2005 03:42 PM  13 years agoPost 27
wleew

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Pittsburgh, Pa.

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Works for me!!

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03-30-2005 10:54 PM  13 years agoPost 28
Lock-Tite

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Quebec, Canada

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Judging by the posts, if I count well we have

8 pilots that do tie the antenna
5 that dont recommend it.

It looks to me that it does not make a big difference weither it is tied or not since no one reported problems doing it.

Frank
Dont forget to bring a clean pair of shorts when flying 3D ;)

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03-30-2005 11:11 PM  13 years agoPost 29
Drunk Monk

rrProfessor

Preston, UK

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It's only a problem if you wrap it around the boom


Stephen

I only open my mouth to change feet.....

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03-31-2005 01:18 AM  13 years agoPost 30
okw14

rrApprentice

Morgantown, WV

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The main reason few problems have been reported is that the RC heli never gets too far away (we hope ). Even if straping the antenna to the aluminum or carbon boom support reduced the range by 50%, you could still fly farther than you can keep track of the heli's orientation without signal loss.

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03-31-2005 02:23 AM  13 years agoPost 31
midwestpilot

rrElite Veteran

Crystal Lake, IL

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holly crap...
Has there been one crash documented from the antenna routed in this manner....I think the answer would be no.

I love all the speculation though...

I 'll join the speculation...I think the failure rate of a loaded antenna due to breaking and fatigue is far greater than running the wire in a plastice tube next to the boom supports...no facts to back that up though...so what does it mean...not much

My facts...5 years on two machines run exactly as the first picture shows...never a problem...

Dude you are fine...don't mess with it.

In life there is no spacebar!

Rich Erikson AMA 6175

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03-31-2005 03:26 AM  13 years agoPost 32
JoeBecker

rrApprentice

Thornton, CO

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Here's how I do mine:

The antenna runs inside 2 antenna straws-- I made a joint from fuel tubing at the rear side of the skids at the end of the first straw, then angled the second straw to join up with the boom support. A 3rd straw is zip tied to the boom, but the antenna does not extend past the second straw. This way, the antenna wire is fully protected from oils and dirt, the installation is tidy, and the wire never runs along the boom support itself.

The beatings will continue until moral improves

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03-31-2005 02:08 PM  13 years agoPost 33
midwestpilot

rrElite Veteran

Crystal Lake, IL

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hmmm...
I must have been a bit grouchy last night...

Sorry about the tone in my post above... was inappropriate.

I guess I got a little miffed about the basement science being thrown around..silly me

In life there is no spacebar!

Rich Erikson AMA 6175

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03-31-2005 02:23 PM  13 years agoPost 34
dariof

rrVeteran

Henderson, NV / Laguna Niguel, CA

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Lock-Tite


Your idea is fine.

I do the same, EXCEPT I use three stand-offs to run the antenna parallel to the boom support. Therefore, it is not close enough to the boom supports to make any negative difference (if that even happens), and you do not have to cut a perfectly good antenna to adapt a base loaded. Remember, when cutting a pefectly good antenna and attaching a base loaded, you run other risks as previously discussed.

You can see what I have done in my gallery. Many at our field have also used this technique, with absolutely no issues.

Best Regards, Dario

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03-31-2005 02:35 PM  13 years agoPost 35
Lock-Tite

rrVeteran

Quebec, Canada

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Dariof, thanks. I will try that !

Your pics :

Frank
Dont forget to bring a clean pair of shorts when flying 3D ;)

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03-31-2005 02:47 PM  13 years agoPost 36
dariof

rrVeteran

Henderson, NV / Laguna Niguel, CA

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Lock-Tite

I simply use a piece of fuel tubing cut to length, and a nylon tie wrap. Costs a couple of pennies, assembles in a couple of minutes.

Best Regards, Dario

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04-01-2005 09:25 AM  13 years agoPost 37
Ali92124

rrApprentice

San Diego, CA

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Dariof
Great idea. The best of both worlds. btw, where do you get those standoffs?
Thanks,
Ali

I dont need no stiiiiiinkin signature.

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04-01-2005 12:17 PM  13 years agoPost 38
dariof

rrVeteran

Henderson, NV / Laguna Niguel, CA

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Ali92124

I use fuel tubing cut to length for stand offs. Either Tygon (yellow color) or just the medium blue fuel tubing.

You can also choose the color of the nylon tie wraps if you want to get "color creative."

Best Regards, Dario

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04-01-2005 12:19 PM  13 years agoPost 39
Zach Sparks

rrVeteran

Norton Shores, MI

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I have flown two years on my X-Spec with the antenna routed like this. No problems at all.

My Sceadu is mounted the same way. Works great and is out of the way.

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04-01-2005 08:35 PM  13 years agoPost 40
SPB

rrElite Veteran

Athens - Greece

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Quick UK base loaded antenna on both my helis.

Never had an issue. My 50 so far have met mother earth 6-7 times (some of them nose in and pretty hard). Quick UK antenna is still intact.


Sotiris
myhelis.com Flying Team

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HelicopterMain Discussion › Antenna tied to boom supports
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