PDA

View Full Version : I hate wire antennas!


datamike
10-30-2003, 09:28 AM
Hey guys I need your expert help here.....

Am I the only one that hates the thin wire antennas that come with every R/C car?

First, they're a pain to deal with. Coiling the excess in the radio box, or winding it around the tube both cause problems. Plus, the wire is quite susceptible to damage and over the years I've replaced several antenna wires.

Second, I think they look terrible. Nothing screams "toy car" more than that thin plasic tube sticking straight up ruining the scale looks of our cars and trucks.

The wire antennas have irritated me since I was originally involved with r/c cars and planes in my teens. Then and now, I wrestled with the problem and came up with different solutions.

Currently, I've developed a "stealth antenna" that works great. Basically it's detachable from the receiver (which is great for maintenance, etc) and fits completely under the lexan body shell. Mounting varies depending on the car/truck. It works great. In fact, my testing using various trucks/cars is that it actually has a longer range than the stock wire antenna.

Now before anyone starts with the "you can't do that, antennas are tuned, yada, yada, yada", I must state that I am a computer/electrical engineer and have done my research before I attempted this project. I am not providing specific details as I'd have to file a patent application first (already talked to our attorney about it).

I've talked to a few people in the r/c industry about this, and have received a few different responses. Some have been positive, but many seem to have the "not invented here" syndrome where they are not interested in anything they didn't think of.

Some people have mentioned that the stick antennas aid in rolling the car/truck upright after a crash. In my testing, that doesn't seem to be the case with the occasional exception of touring cars, and certainly not with heavy monster trucks. I'd love to have some input here.

Anyway, I'd really like to know what you guys think. Is this something that only bugs me? Am I the only one that thinks the standard stick antennas ruin the look of our trucks/cars? Do you think this is a marketable product?

If I were to sell them, they would be in the $25-30 range.

Thanks for your input.

DCLXVI
10-30-2003, 10:30 AM
I'd love the idea...I hate the tyco look-alike tubes...

anothermbdusted
10-30-2003, 11:13 AM
sounds like a good idea...as far as a tuned antenna goes I think thats a line of BS.....i've rapped mine around a few axles befor and it dont seem to matter if the antenna wire is 6 foot or 3 foot its all the same on a race track... as far as the quick disconnect why couldnt you use a gold connector as a quick release its got great connductivity and you can buy them for cheap also...personally w/o seeing the actual product your talking about i would say the 25-30 would be a little high for a starting price but i dont know what it looks like or does so ill have to say that i would bother with the wire instead..

datamike
10-30-2003, 12:06 PM
Originally posted by anothermbdusted
sounds like a good idea...as far as a tuned antenna goes I think thats a line of BS.....i've rapped mine around a few axles befor and it dont seem to matter if the antenna wire is 6 foot or 3 foot its all the same on a race track... as far as the quick disconnect why couldnt you use a gold connector as a quick release its got great connductivity and you can buy them for cheap also...personally w/o seeing the actual product your talking about i would say the 25-30 would be a little high for a starting price but i dont know what it looks like or does so ill have to say that i would bother with the wire instead..

Actually it's not quite BS...there are established formulas and theories regarding antenna design. Such as:

antenna length (in feet) = 984 / frequency (in megahertz)

However using this formula you end up with a ridiculously long antenna.

So, like with most things, there are are compromises to be made, as well as other factors that affect the effectiveness of any particular antenna design.


Also, theories are only useful as a starting point. It's when I started building prototypes and doing real-world testing where I really started to figure it out.

Michael

DCLXVI
10-30-2003, 05:34 PM
I think that the antenna legth are dividable (is that a word?) with the frequency...you won't need a looooong antenna...just as long as the length are right...

lerningdriver
10-30-2003, 05:49 PM
PPL! the dude is an electrical engineer, i think he kinda know what he talkes about so let him do his thing, also, just like datamike said, the 25-30 range is too high for an antenna, not saying you woulden't get any ppl to buy it, but if you go down a bit you might make a new standard in RC antennas (that goes for tyco too ;) )... just some info to think about. :D

DJ the AE fan
10-31-2003, 12:05 AM
I would have to agree with u the wire antenna looks like crap. If u create an antenna that mounted under the body and gave u better range I would buy one. IMO i don't think the price u are asking is to high. But then again I'm a person that is pick on how things look and price dosen't matter if it make it look 300 time better. So let us know how it goes with your antenna.:)

AudiTT-Quattro
10-31-2003, 02:05 AM
Deans makes a 2 piece baseloaded antenna that's about 6" long. Plus you can form it so it stays inside the body as it is uniform free standing without an antenna tube.

I've used these antennas on my robots and most of R/Cs. They run for $10 on Tower.

Nosaj-Maxx
11-01-2003, 09:11 PM
Its easy to make your own antenna just use the formula: 984/ Freq(mhz) and then you will know how long the wavelength for your frequency is. Then decide if you want to go 1/2, 1/4 or 1/8 wavelength.
Example my frequency is 75.910, 984/75.910 is 12.96. So the wavelength is 12.96 ft a 1/2 wavelength antenna would be 6.48ft. 1/4 would be 3.24ft, 1/8 is 1.62ft and so on.

Obviously the closer to the full wavelength the better but that would be nuts :D . But using coils you can fit a 1/4 wave tuned antenna easilly. No coils and a 1/10-1/12 wave is about the most you would want.

But back to the original posters topic, yes stock antennas annoy me, yes I would buy a good tuned "stealth antenna" but it better be awesome for 25-30 bucks and better be 1/4 wave or +. You probably dont need an patent though becuase most likely your idea has already been thought of, I think antenna design has just about been explored to the fullest extent.

Pro3/nmt105
11-01-2003, 11:04 PM
If you want a stealth antenna you can do what alot of 1/12 scale guys do, just take a piece of lexan, cut V shaped slits in it (be sure to round the pointy part at the bottom of the V so it dosnt cut the antenna) and wrap the antenna around it in the slits so that the antenna dosnt contact itself in any place. Someone probably makes them precut. It might affect range slightly so you might want to check your range before using it, but I know they work because some of the 1/12 guys at my track use them. Ill see if I can find a pic.

Avalanche
11-11-2003, 08:59 AM
Originally posted by datamike
Hey guys I need your expert help here.....

Second, I think they look terrible. Nothing screams "toy car" more than that thin plasic tube sticking straight up ruining the scale looks of our cars and trucks.

Thanks for your input.

First, I hate to break the news to you but RC cars ARE "toys".

Second, Stealth or hidden antennas are yesterdays news, they have been around for a while now. I have a beauty on my Savage. You may have a cool idea but I'm sure someone out there is already using it.

BoDuke
11-11-2003, 07:20 PM
where'd you get it from?

bullethead
11-11-2003, 07:41 PM
yeah, where did you get it from?


bullethead

Avalanche
11-11-2003, 10:28 PM
Originally posted by bullethead
yeah, where did you get it from?


bullethead

Made it myself out of laminating plastic. All you have to do is "snake" the antenna in a S pattern in between the two halfs and use a heat source to melt them together, Or you can use the adhesive laminate which is much easier. The laminate with the antenna sandwiched inbetween it can then be mounted anythere under the body. Personally a $1.50 antenna tube or a 50 cent sheet of laminating plastic is much better than a $30 antenna mod anyday.