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HomeAircraftHelicopterHelicopter Main Discussion › Aahhh S@^t!!!!!!!!!!!!!!!!
07-16-2002 12:54 AM  16 years agoPost 1
corey11

rrElite Veteran

Bay Area, California

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Well, while i was making a stand for my raptor, i put all the wires in a good looking way. So i had to cut some zip ties and snip! I look down and i accedentily cut the reciever attenna!!!!! Every single word i said was a sware word! That was going on for about 5 minutes! i was so pissed off at myself! So my question is, Do i have to buy a new reciever? the anttenna is only about 4 inches long...........now. Is there any way to soilder it or something?? Its a pcm reciever. If i have to buy a new its going to be around 70 bucks. Please say there some kind of way of fixing it.

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07-16-2002 12:58 AM  16 years agoPost 2
corey11

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Bay Area, California

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whats a base load anttenna?how much and were can i get one?

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07-16-2002 01:04 AM  16 years agoPost 3
SemiArticulate

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On Location

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Put it end to end and solder it. It is just a wire. Use heat shrink tubing to cover it back up. total cost $0.03.

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07-16-2002 01:08 AM  16 years agoPost 4
corey11

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Bay Area, California

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Whats better???
Witch one is better? the base load anttenna, or the soildering method? i found out the the base load antenna is going to be about 10 dollars and the soilder is just going to take time. but, witch is better. I think most likely the base load antenna, but i would realy like to get it done now and not what for it to come in the mail.

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07-16-2002 01:10 AM  16 years agoPost 5
Raj Patel

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Humble, TX

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cut wire
I agree, I have used base loaded antenna's and then decided to just use the wire for simplicity and I just solder the 2 wires back together and use heat shrink to protect the joint.

Raj

R. Patel, International Captain, ConocoPhillips

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07-16-2002 02:03 AM  16 years agoPost 6
Mosiris

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Opelika, Alabama

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I hate to sound as new as I am
What is a base load ant ? Since I am broke after entering hobby for a good bit, I would solder it. Would that make an r/f interference (sp?) issue later down the road ? As I fly solo, or the only aircraft ( I hope within 2 miles of my t/x).

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07-16-2002 02:09 AM  16 years agoPost 7
Beezer

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Ontario, Canada

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You could also just buy a replacement antenna wire that is made for you brand RX. I know Futaba and JR both sell replacement antenna wires. Just need to open up your reciever, unsolder the old wire and solder the new one in place. I think they cost about $2.00 each just check with your LHS.

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07-16-2002 02:34 AM  16 years agoPost 8

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2.00
I agree with breezer, Iv accidently cut my reciever wire twice now. Your LHS probably caries the reaciever antenna wire for around two bucks.
Just open the reciever case and take off the old antenna and solder the new one on.

Iv tried to solder the wire back one to the original length and had bad luck. Iv heard of it working sometimes but more time that not its going to give you range problems. If your going to try this make sure you don't use to much solder at the joint or it will pick up the transmittion from that point and you will have bad range.

A couple weeks ago i tryed a deans whipe antenna ( Is this a base loaded antenna?) and didnt have any succes. It would start glitching at about 50 yards. Took it off and went back to the wire and it worked great.

I would send it in for repair or solder a new wire on yourself.

Good luck

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07-16-2002 02:50 AM  16 years agoPost 9
03fomoco

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Tucson AZ

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No big deal.
Just solder it together and heat shrink it. If you are real crafty replace the whole thing. I think futaba sugest 90 to 100 cm for the length for 72 Mhz. This kinda implies that length is not as critical as others might suggest. Obviously the gauge of the wire does not matter and maybe a little thinker may be better for life. Check with futaba and confirm and then try it and do a range check and you can't go wrong. If you get over 150 feet with the antenna colapsed then you are good to go. Unless you have a 9z then you would only have to walk about 25-50 LOL.

-Dave

Sadly Sponsored by: VISA, MASTERCARD, and Bank of America

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07-16-2002 04:25 AM  16 years agoPost 10
Heli-Driver

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Arlington, TX

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I use a Revolution Base loaded antenna with 4 inches of wire left on the receiver. My range is outstanding with this setup and have never had a glitch. 12 bucks, easy to install and cleans up the heli, I run mine forward inside my canopy and you don't see it at all.

I ran it on another heli mounted half way down the front plastic landing gear strut with the antenna facing rearward. Just keep it away from metal and you will be OK.



Raymond

Predator Gasser SE/231 X 2
Century Helicopters

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07-16-2002 05:31 AM  16 years agoPost 11
corey11

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Bay Area, California

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I soildered them back together and i get about 130 feet with the antenna collapsed so i think im fine.

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07-18-2002 01:16 PM  16 years agoPost 12
321

rrApprentice

FL

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07-18-2002 01:26 PM  16 years agoPost 13
Twobeers

rrKey Veteran

Toronto, Canada

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You can solder it back together and cover it with a piece of heat shrink. The critical criteria is that you solder joint must be smooth, no bumbs or sharp ridges of solder sticking up as that would affect the tuning of the antenna wire.

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07-18-2002 01:59 PM  16 years agoPost 14
JJsaratogaNY

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Centreville, Virginia

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Well, I am going to offer up my two cents. Conventional wisdom dictates that you "aren't supposed" to solder a cut rx back together. I have and it worked fine for a year. Conventional wisdom also says that base loaded antenea are not as good as a real antenea. I also think that's crap. I have been using them now for almost a year, and to be honest, I get less interference than I used to get. Scientifically speaking, it may be true that base loaded isn't as "good" as a real antenea, but if that's true, then the difference is negligable. Base loaded antenea (like the Dean's whip antenea) are much neater looking in my opinion. I have mounted them several different ways. On my raptor, I mounted to the front skid pointed out away from the canopy like a refueling probe. On my ergo, I have it mounted inside the canopy, out of site. My opinion on your problem is to solder it back together for now, and order yourself a nice whip antenea from heliproz.com

uuuggghh! I'm getting sucked backed in again...

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07-18-2002 03:06 PM  16 years agoPost 15
Bird_E

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Erie, CO

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I bet a the 4" would work fine!
I bet that if you ranged checked your receiver with the 4 inches of wire you had left after you cut it, there would be very little change in useable range then from a full length antenna...... Its a receiver - not a transmitter -- not as critial. Heck, the orientation of the antenna (verticle vs horizantal will make MUCH more of a diffrence then length!.

Heck... I'm even confident that you could fly with decent range with NO antenna! - However - I'm not suggesting this!!!!!

Bob

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07-18-2002 04:17 PM  16 years agoPost 16
funder

rrApprentice

Houston Texas @ JSC field

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Antenna wire
Futaba is very firm that their antenna wires are 1100mm long. Other than that soldering the wires is as good as soldering the entire antenna wire into the reciever. Get a good solder joint and put heat srink on it do a range check after you finished. Also the previous writer is correct the length isn't critical. Just try to keep it within evenly divisible parts of a wave length.

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07-18-2002 04:35 PM  16 years agoPost 17
Malorie

rrElite Veteran

Paw squared, MI

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My only concern with soldering it back together is that by soldering the stranded wire you essentially make it a solid wire (in the area of the solder). It becomes prone to bending stresses, including micro bending, more quickly than braided wire. I would say, go to your local Radio Shack and pick up some similar guage (If not the same go bigger) wire, cut it to the same lengthe as the original, and solder it directly into the reciever.

Life's a journey, NOT a destination.

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07-18-2002 06:14 PM  16 years agoPost 18
sharam

rrElite Veteran

Northern California - Fly at Morgan Hill Field

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Just solder it together and put some shrink tubing over it. Easy and quick.

Replacing the whole antenna wire is a bit more involved. You have to remove the old solder joint and resolder the new wire. There is a risk of melting the input circuitry when you do this if you are not experienced at soldering. The risk is much less when you have to resolder a joint a few inches out.

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07-18-2002 10:47 PM  16 years agoPost 19
SemiArticulate

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On Location

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My freya got its antenna cut about a year ago during a crash. It broke at the relief that I had installed to keep it from pulling out of the RX. I put the broken wire end to end and soldered it and used heat shrink tubing. It worked fine.

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07-18-2002 11:38 PM  16 years agoPost 20
AdamH

rrApprentice

Northeast England

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321,
*Optimal would be a straight wire antenna that is 1/4 as long as the rf carrier wave
For 72 Mhz this works out exactly 1m but for 35 mhz here in the uk, this
would have to be 2m!

(1/f) * C = wavelength :

where f = frequency(hz) & C = lightspeed(m/s)

(1/72,000,000) * 300,000,000 = 4.16m

and 1/4 wavelength is 4.16 * 0.25 = 1.04m

for 35Mhz : (300/35) * 0.25 = 2.14m

are my calcs wrong here or are our antennas to short or don't it matter because mine works fine and if it's an 1/8 wavelength then in theory your antennas could only be 50cm with same results unless other factors have a greater effect, like the amount of energy absorbed or something.

Adam.

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HomeAircraftHelicopterHelicopter Main Discussion › Aahhh S@^t!!!!!!!!!!!!!!!!
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