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Look at it this way, the antenna is only 31 Cm. long you have two of them on your RX they recommend a 90 degree separation of them. They make a extension in length (but is coaxial shielded) so the user can mount one antenna in the vertical plane in a area that is not surrounded by carbon fiber, & the other antenna mounted in the horizontal plane. Supposedly this was done to prevent carbon fiber shadowing.
Carbon fiber is not lead, carbon fiber is conductor of electricity a poor one but it will still conduct. Lead will conduct also, but lead will shield RF signals if it is electrically grounded, I don't think a free standing piece of carbon fiber will shield RF unless you actually had it wired up with a positive & a negative wire for it to make a circuit. Take the tail boom for instance, on my heli it is made out of aluminum not CF & it is held at both ends by plastic holders no way for that be connected electrically. So the tail boom may impede some of the RF just because it is made of metal & I don't think 2.4 GHz. passes through metal too well but it will pass because the boom isn't electrically grounded which would capture the RF & send it to ground. Short wave RF 2.4 GHz. will only transmit in a straight line & will not bounce off of the earth or the ionosphere like a long wave frequency will, plus it takes more power in wattage to transmit it compared to a lower frequency. Our transmitters are only putting out <100mw that is less than a 1/10th of a watt which isn't much. My 78 Mhz. RC car TX put out the same wattage & it's effective range was around 800 feet & that was with a lower frequency than we run. I wouldn't trust my heli being more than 3-4 hundred feet from me, these TX's don't have the range. So, I am happy also that Walkera is going to replace my transmitter, I need to check my mail & see if they sent a confirmation that it shipped. They are really quick when they have shipped to me before. Quote:
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Japan, Tokyo
Joined Jun 2011
2,088 Posts
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Anyway, if you can fly your V450D01 at 500m+ then you should be doing something else with your eyesight! |
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Very funny with the eye sight distance, I was saying feet not meters.Although we use to fly planes at a mile up & 2 miles away with 72 MHz. but those TX's put out 1 watt of RF power. Quote:
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Japan, Tokyo
Joined Jun 2011
2,088 Posts
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Yeah, 72MHz would carry much better than 2.4GHz for sure. I wish I knew more about how to work it out theoretically and then divide by say 2 to have a safety factor. I did notice that when I flew around the Angel of the North (big steel sculpture) over summer that I completely lost contact with my quad as it flew through the shadow. I expected it so I had it moving at a pace before it entered to maximise the chance of it getting out the other side before meeting terafirma. |
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Just Google "frequency + distance calculator" it will ask you to enter the freq. & the power of the TX I am sure you will find something out there in this great world of the Internet.
The Angel of the North acted like a grounded metal grid which took in your TX RF & feed it to ground. Never fly near something like that......... I once worked in a large main-frame computer facility room that was shielded with very fine copper mesh surrounding the room on all of its sides including the floor & grounded. The purpose was to prevent a satellite from receiving the electrical impulses which were data that was highly proprietary & for the Mfg. of U.S. submarines & that was only for the propeller of the sub. Man that is getting freaky! Of course you know that what I just stated does not infringe upon any secrets, just observation of said facility, & what they Mfg. I was surprised I was allowed in there with out a clearance, but I was there to repair the computer which we made. I had since gotten clearances for tons of stuff, a job I would never do again, because it is such a pain in the Ass with all of the "the need to know" & who you can talk to or around. But enough about that crap, go check out the Google thing & have a blast! Quote:
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Yes, i know the theory behind it. But your discounting the variables. One of which is Walkera RX units obviously have a problem with CF shadowing. Or at least the 2702V did. The logical assumption would be that since they develop all their own electronics. ALL of their RX could be prone to this problem. Farther adding to the assumption is the constant changes they are making to the new Devo RX with the antennas. First two short antenna, then one long, now two long. Come on, they don't know what the hell they are doing and it's evident. Quote:
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The invisible threat that pulls apart DNA, causing genetic disorders and cancer! |
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Try this link:
http://wirelesscomputing.net/house2/RangePrediction.htm I found that roughly our TX's are good for about 200 meters. Quote:
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GAH, Metric conversions. Why can't we all just get along!?
Okay, that makes sense. The typical unobstructed distance of most 2.4ghz things i have ever bought. Including cameras, phones, other crap. Actually listed right on the package "100m range" or "100m unobstructed range". Which is what? 300 feet right? So i'm positive, absolutely that it's MORE than 300 feet or one full size football field to the parking lot of the movie theater. Easily 500 feet, to the parking lot closest side of it to me anyway. Another 200 or so to the building. After doing a high speed loop i ended up basically over the cars. Now, depth perception is a bitch. But i'm pretty good with it and i've always passed those little ball tests with the circles on the ASVAB and things with great scores. So i could have been closer then it seemed. Maybe i was just being paranoid. But i'm sure the heli was over cars at that point. It looked like my v120 flying around up there. |
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I was giving the best case scenario on distance. But I do agree with you on Walkera is not sure of how to fix the problem.
Here you are in your video stating the temp. was 80 & with the wind blowing your fingers were getting cold. I think it was because you gripped the transmitter sticks so tight that you cut-off the blood flow to your fingers. Don't laugh, I have done that before!BTW it F--king snowed here last night, we got about 3 inches, the previous day the temp. was down to 22 degrees Fahrenheit. And you are cold? ![]() Any Rf freq. that is in the 1.0 GHz range is a problem to all animals & humans health, plus ultra low freq. under water have been screwing with sea mammals & I am talking about the sonar barriers to detect enemy submarines & such. Why do you think that there have been so many beaching of whales & dolphins? They got there receivers blown out by the super loud "Pings" from the military. Quote:
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Anyway, yeah. It's like 80 with direct sunlight and it's warm. If you were in the shade it would drop to about 50. Since the wind is blowing at 15-25mph the wind chill is significant with the actual air temperature being in the 60s. Florida weather is a math equation based on many variables. Anyway, i suppose i should be more careful not to go so far out over the cars. I want to get AMA and try the fields out. But the truth is i will be buying more batteries for the X5 before i pay $70 for the AMA and possibly end up having to pay it again in January. I don't feel like researching how they play that game right now. Besides, AMA only insures their pilots at a AMA sanctioned field. Not my spot at the movies Since they wouldn't let me fly at the AMA field, i don't know if it's worth paying to fly at. Kind of stupid isn't it?
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