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antenna question? - 7/3/2003 11:58:32 AM   
flyfree69



Posts: 130
Joined: 1/22/2003
From: DES-MOINES, IA, USA
Status: offline 		is it ok to tie my antenna in a loose knot at the end to keep it from comming back into the fuse.? will it mess the reciption up? thanks
       Post #: 1

antenna question? - 7/3/2003 12:05:54 PM   
WreckRman2



Posts: 1495
Joined: 5/13/2002
From: Indianapolis, IN,
Status: offline 		Just take an old servo arm and cut it so you have two holes in it. Then feed the antenna through it and it will act as a stopper.

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antenna question? - 7/3/2003 9:20:12 PM   
mulligan



Posts: 1147
Joined: 4/14/2002
From: Sanford, FL, USA
Status: offline 		... or use a clothes button.

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       Post #: 3

antenna question? - 7/3/2003 10:16:09 PM   
greenboot



Posts: 1173
Joined: 1/16/2002
From: St Louis, MO, USA
Status: offline 		The knot method does work. Somehow, the electrons are able to find their way to the receiver.

Tom

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       Post #: 4

antenna question? - 7/3/2003 10:18:28 PM   
MajorTomski



Posts: 1400
Joined: 5/1/2003
From: Oklahoma City, OK, USA
Status: offline 		[QUOTE]Originally posted by greenboot
The knot method does work. Somehow, the electrons are able to find their way to the receiver.

Tom [/QUOTE]

But depending on which way you tie the knot the airplane will now snap roll to one way a little better than the other because of the electrons spinning from the knot

(in reply to flyfree69)
       Post #: 5

antenna question? - 7/3/2003 11:08:22 PM   
BillHarris



Posts: 835
Joined: 12/20/2002
From: Jasper, AL, USA
Status: offline 		of the electrons spinning from the knot


Wrong, wrong, wrong. This is an Rx, so the electrons are trying to get out of the aether and into the wire. Spinning electrons happen only on transmitters with knotted antennae.



--Bill

(in reply to flyfree69)
       Post #: 6

antenna question? - 7/4/2003 1:40:15 AM   
DBCherry


 

Posts: 5554
Joined: 1/25/2002
From: Hubbardston, MA, USA
Status: offline 		I do it the way WreckRMan does. With an old servo horn. You can also use them as a strain relief inside the fuse where the antenna wire exits.
Dennis-

Attachments
Click to see fullsize image.
Click for fullsize


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       Post #: 7

antenna question? - 7/4/2003 2:49:10 AM   
FLYBOY



Posts: 8692
Joined: 1/7/2002
From: Missoula, MT, USA
Status: offline 		If you tie a not, eventually, you get a break in it. Better doing it the way DB shows. Works well.

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       Post #: 8

antenna question? - 7/4/2003 5:30:45 AM   
deejay_rcpilot


 

Posts: 10
Joined: 8/22/2002
From: mesa, az
Status: offline 		ok, you guys then button/servo arm are great until you crash :-o

they have a tendency to rip the antenna out of the receiver

I've been using a short piece of fuel tubing for many years and never had one pulled out yet

take a piece of fuel tubing and cut part way through it on one side two cuts about 1/4 inch apart

bend it back and slide the antenna through the first slot then through the inside of the tubing, then trough the other slot

this provides enough drag to keep the antenna tight but if you should catch the antenna on the truck or during a crash it will slide out

btw a slit in the remaining piece of tubing slips over the head of a landing gear screw that is placed on the top of the rudder or on the wingtip of the model or the underside of the model

drawing legend ++++++++++ = antenna wire
----------------- = fuel tubing sides
| = cut in fuel tubing
(notice only part way if not on top and bottom)
T = small screw in top of rudder
******** edge of rudder/wingtip etc
++
|----|----|--------| (darn this is hard in ASCII)
++++ +++++++
|--------------|---|
T
********* (obliviously this is not to scale)
* *
* *
* *
* *

(in reply to flyfree69)
       Post #: 9

antenna question? - 7/4/2003 6:54:19 AM   
WreckRman2



Posts: 1495
Joined: 5/13/2002
From: Indianapolis, IN,
Status: offline 		[QUOTE]Originally posted by deejay_rcpilot
ok, you guys then button/servo arm are great until you crash :-o

they have a tendency to rip the antenna out of the receiver

[/QUOTE]

Who builds an airplane based on what will happen if you crash? I build my planes to fly and if I crash well then what happens will happen. Odds are if you crash hard enough to pull the out the antenna, the reciever will need repaired/replaced anyway.

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       Post #: 10

antenna question? - 7/4/2003 7:23:04 AM   
DBCherry


 

Posts: 5554
Joined: 1/25/2002
From: Hubbardston, MA, USA
Status: offline 		Look at my graphic again deejay. It says the notch is for a rubber band. The rubber band attaches to the vertical stab and provides all the "give" you'll need.

Another horn acts as a strain relief INSIDE the fuse prevents the antenna wire from being pulled out of the receiver. (It'll break outside first.)

By the way, I also use the slit fuel tubing pinned to the stab. Depends on the plane.
Dennis-

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antenna question? - 8/21/2003 12:01:43 AM   
bighawg


 

Posts: 16
Joined: 8/9/2003
From: Burgin, KY, USA
Status: offline 		I like to use a pc of thin plastic tubing inside the fuselage and out the tail to slide my reciever antennae into. An internal installation. Never had any trouble with any planes reception this way either.
Nothing outside the plane to hang up.

(in reply to flyfree69)
       Post #: 12

antenna question? - 8/21/2003 12:35:36 AM   
Crash_N_Burn



Posts: 535
Joined: 3/29/2002
From: d, AL,
Status: offline 		Where did this "Don't-tie-a-knot-in-the-antenna" taboo ever come from? Can some one tell me how early in their R/C career they heard it?

I've been hearing it for years and years.

Remember this is a receive antenna, not a transmit antenna.

...and it really doesn't matter.

Do a range check with it unknotted and with it knotted. Any difference? I didn't think so.

I tie a knot in the antenna before it exits the fuse (to keep from being pulled out of the receiver if snagged) and once again at the end to pin it to the fuse. Never had a problem.

And mechanically #22-26 stranded wire should not be weakened in the least, even for years with the knot.

And yes, I'm an antenna engineer and I sure would like to know how long this falsehood has been perpetuated and who-in-the-heck started it???


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-dave-

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       Post #: 13

antenna question? - 8/21/2003 6:32:53 AM   
JohnVH



Posts: 14763
Joined: 12/5/2001
From: Lynden, WA, USA
Status: offline 		Buy a whip antenna then you dont have to worry about routing the wire! Thats how I do it

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       Post #: 14

antenna question? - 8/21/2003 7:57:15 AM   
viper1



Posts: 259
Joined: 1/31/2002
From: Melbourne, AUSTRALIA
Status: offline 		[QUOTE]I do it the way WreckRMan does. With an old servo horn. You can also use them as a strain relief inside the fuse where the antenna wire exits. [/QUOTE]

Does it matter on which servo arm I attach the antenna? Elevator, rudder or throttle ?


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