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Rubber Ducky Antenna

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Old 10-11-2004, 08:32 PM
  #1  
Nogyro
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Default Rubber Ducky Antenna

Does anybody have any experience with this type of antenna? http://www.htantennas.com/ It would sure eliminate forgetting to extend it, and also the dirt build up on them making them difficult to extend.
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Old 10-11-2004, 11:15 PM
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WycheG
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Default RE: Rubber Ducky Antenna

Been using them for almost 6 years (I think) now. Work great. No issues whatsoever. I personally liked the old method of attachment (screw-on antenna vice BNC), but I recently bought a new antenna with the BNC connector and it has been working trouble-free also.

Try it, you'll like it.

Greg
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Old 10-12-2004, 06:46 PM
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tande
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Default RE: Rubber Ducky Antenna

Ditto!---
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Old 10-13-2004, 10:30 AM
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Default RE: Rubber Ducky Antenna

I've been using mine for a few years now. No problems. Just remember to point the antenna at the plane when at a distance unlike the stock antenna. It has a different radiating pattern.
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Old 10-13-2004, 12:05 PM
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Default RE: Rubber Ducky Antenna

I've had one on my ACE MicroPro 8000 since 1992, it was sold by ACE as an option.
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Old 10-14-2004, 10:27 AM
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Rodney
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Default RE: Rubber Ducky Antenna

There are differences, are they a problem? Depends on your definition of problem. One, to range check, you must remove the antenna from the transmitter if it is a rubber duck or be prepared to walk a quarter of a mile away. The second, a slight loss of range, usually not enough to worry about. The direction of strongest radiation is just the opposite of the usual long antenna, i.e. as mentioned above, point the rubber ducky at the plane for maximum range; just the opposite of what to do with the normal antenna.
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Old 10-14-2004, 12:59 PM
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Default RE: Rubber Ducky Antenna

You do not need to remove the Ducky to range check, just point in the opposite direction from 25 or 30 yards away.
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Old 10-14-2004, 01:04 PM
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Default RE: Rubber Ducky Antenna

ORIGINAL: Rodney

There are differences, are they a problem? Depends on your definition of problem. One, to range check, you must remove the antenna from the transmitter if it is a rubber duck or be prepared to walk a quarter of a mile away. The second, a slight loss of range, usually not enough to worry about. The direction of strongest radiation is just the opposite of the usual long antenna, i.e. as mentioned above, point the rubber ducky at the plane for maximum range; just the opposite of what to do with the normal antenna.

I'm glad to hear all of the positive responces. Myself and two other buddy's have the rubber ducky antenna on the way. I never thought about the range testing proceedure. Have you ever had to turn your body and point the antenna towards your plane in order to regain radio control of it? I generally don't fly that far out, but I am flying a 28% right now, and once in a while doing a rolling circle on a windy day, it can get quite far out there. But normally I fly in close to the runway doing 3D and IMAC.
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Old 10-14-2004, 02:03 PM
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splais
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Default RE: Rubber Ducky Antenna

I have a 28% edge. I've had it out so far I almost lost it to orientation problems; the rubber ducky worked fine. I've also flown it striaght up with the antenna horizontal until I could barely see the plane, still worked. The only problem you have is forgetting to pull the antenna out when you barrow or use a "regular" antennaed radio.
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Old 10-14-2004, 05:02 PM
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Peter Khor
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Default RE: Rubber Ducky Antenna

A quick question ... is mounting a 3rd party rubber ducky antenna considered end-user modification of a TX? I get conflicting views ...(fwiw I do use 'em ...)
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Old 10-14-2004, 05:14 PM
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Default RE: Rubber Ducky Antenna

Great to hear splais. Seeing as how I have the same plane, that's about as good of test as you can get. Of coarse our set-ups maybe different, but a good comparison all the same. We were talking about getting "out of the habit" of pulling out the antenna after using the RD for a while. The only other transmitter I use is an old 4 channel for my combat spads. Guess I probably do the "ultimate range check" a time or two I'm sure.
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Old 10-14-2004, 05:19 PM
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Default RE: Rubber Ducky Antenna

I wouldn't take the 'maximum radiation off the end' statement too seriously. I think that originated with some very uncontrolled tests performed by the manufacturer. From an engineering standpoint it makes no sense.

Nomatter, the rubber duckies seem to work just fine.
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Old 10-14-2004, 06:12 PM
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Default RE: Rubber Ducky Antenna

I agree JP, I've gone to the other side of my house and had my wife watch the plane and it still works fine.
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Old 10-14-2004, 10:06 PM
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Default RE: Rubber Ducky Antenna

ORIGINAL: JPMacG
I wouldn't take the 'maximum radiation off the end' statement too seriously. I think that originated with some very uncontrolled tests performed by the manufacturer. From an engineering standpoint it makes no sense.
fwiw:

http://www.bergent.net/antenna_field_test.html

As for engineering standpoint, iirc helical antennas DO have max radition off the end.
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Old 10-14-2004, 10:35 PM
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Default RE: Rubber Ducky Antenna

Yes, I am aware of "application note 01". As I said, the test was uncontrolled. In my humble opinion as a professional antenna design engineer with 25 years experience designing and testing antennas from HF through microwaves for a major defense contractor, they are wrong.

If I could produce a short thin antenna with a directional pattern off the end I would be a very wealthy person.

In order for a helix to radiate in the axial mode (maximum radiation in the direction of the helix axis) the circumference needs to be about 1 wavelength or larger. At 72 MHz this would be a helix diameter of about 4 feet! Smaller diameter helices radiate in the normal mode, that is, maximum perpendicular to the axis of the helix just like a dipole.

All this is well known and well documented. You can read it in any antenna textbook. It was first described by Prof. John Kraus in the 1940s.
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Old 10-15-2004, 04:00 PM
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Default RE: Rubber Ducky Antenna

JPMacG,

Wow, professor. You win!

So the max radiation does not occur off the tip. I don't have a PhD in this or 125 years designing antennas for submarines and spacecraft or whatever, but I know that I have not experienced any problems with my rubber ducky and I trust them enough to fly all my aircraft with them over a period of years and to buy and use more than one of them.

Precise radiating paterns, dielectric constants, and quantum physics aside.

Greg
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Old 10-15-2004, 08:17 PM
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Default RE: Rubber Ducky Antenna

Sorry..l didn't mean be arrogant. I should have learned by now to let these things slide.
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Old 10-15-2004, 08:23 PM
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Default RE: Rubber Ducky Antenna

ORIGINAL: JPMacG

Sorry..l didn't mean be arrogant.
JPMacG,

I for one didn't take your reply as being arrogant. That's why I posted the question to start with. Anytime someone can give a more in depth answer than "it just works", I'm all ears.
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Old 10-15-2004, 09:06 PM
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Default RE: Rubber Ducky Antenna

ORIGINAL: Peter Khor

A quick question ... is mounting a 3rd party rubber ducky antenna considered end-user modification of a TX? I get conflicting views ...(fwiw I do use 'em ...)
Yes Peter, it is actually illegal unless you are a Ham on 50/53Mhz to change from the FCC certificated antenna.
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Old 10-16-2004, 03:16 PM
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Default RE: Rubber Ducky Antenna

Warren is correct. If the tx has not been certified (by manufacture) with that particular ant. it is not FCC compliant, therefore illegal.
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