Great tutorial Alex. I made one about 2 months ago and it works great. I would only suggest on this type of tutorial to ZOOM IN REALLY CLOSE because many people have no experience stripping, removing shielding, etc from coax. and will end up cutting through the outer jacket, the shield and sometimes thru the inner jacket .
Not doubting you, but at the end of the video when you demonstrated the poor SWR after shrinking the base end of the antenna, it isn't a valid comparison when it was done on a different antenna. Great video though, this is exactly what I was looking for. I have a 2.4GHz FlySky Flit10 receiver that uses one of these dipole antennas, so I went looking for a 900MHz design, and landed here! So thanks
Hi, thanks for the informative. May i ask, would this also apply for the stock TBS CROSSFIRE MICRO RX ANTENNA? I mount it on a L shape fashion on my quad, securing the active element and ground element on 2 separate zip ties before i put heat shrink on them. Do i need to take precaution to ensure there is an air-gap for the ground element in the heat shrink, just like your example as well?
Quick question.. So if you just added a small copper down plane wire at the solder joint (Like the original CF antennas) how is this antenna better? In search of knowledge :)
What do you need a close up? I can Email you a photo. If you press the "HD" button on You Tube, you should be able to get enough definition. If not, You Tube "might* let me edit it and add photos.
What is the math behind the design. I would like to try building this for a lower and higher frequency. I have built these as described and they work great on my meshtastic nodes.
It's actually really complicated. The issue is the permitivity of the grounded element or more specifically, the air gap under it. The gap needs to be 1/4 wavelength accounting for this effect. Also, the larger the spacing between the cable and the grounded element, the stronger the choke effect is.
great vid. question: does it need AIR in the air gap area or separation? could non-shrinkable piece of tubing or tpu be used to create a gap that doesn't need to be air filled? I'm thinking about long term durability, after repeated flexes or exposure to heat etc.
If there is anything but air, the counterpoise length would need to be changed to accommodate the change in dielectric speed. In all honesty, the durability of this is probably more than adequate in the long term. However, if you have a suggestion on what else that could be filled with, I could certainly research it for you and give you new dimensions to make it work.
@@CAGreve1231 what I was thinking was some sort of a 3d printed tpu tube, which had a small eyelet on it to let it be bolted down to a top plate or around a standoff, so the sma wasn't the mounting point.
I am not sure how to explain this because it isn't easy to describe through text, but I will try: Anything underneath the counter element (braided shield) changes the velocity of propagation in the chamber it creates with the coaxial cable. The reduction in speed depends on the relative permitivity of the material and the % fill of that material. So I guess it would depend on how the TPU part was made, how much infill was used, and how far up the cable it went. If you made it solid, then I would make an educated guess that the length of the shielded portion would be ~2.4" by my best guess. However, you would also need to adjust the feedpoint, too. THus you would need about 1/2" of exposed shield (where I had ~3/16") on the cable BEFORE the added braid. This should give you a decent balun and resonance. I am happy to experiment with this if you like. If you design it, I can 3D print the part and test. I will give you full credit for the work in the video, of course.
@@CAGreve1231 I totally understand your point that it would affect the rest of the measurements. the goal for me would be to find a balance where the antenna performed as well as possible, and was easily mountable without putting strain on the sma connection, durable and did not start to lose efficacy after repeated flexings or bending that might change an air gap. or accidental exposure to heat, or anything else that might change the air gap. maybe it's an unnecessary exploration but it seems like an interesting one, and I like the idea of this antenna a lot.
Dear Sir, What is the best antenna for TBS Crossfire the diamond or the tuned one ? what is the difference between them? Was the tuned one made by VAS also?
If i need a bit of rigidity? Would it be ok to ad a (correct diameter) “forever tube” on the bottom half? Of course keeping the air gap but adding rigidity to the lower half of the antenna....??? Or will that screw up the quality???
Hey Alex!! Do you know how well this scales down? Do you think it would be effective to build an antenna for a micro lightweight build, taking it down to 3” or or even 1.5”? I’m talking about needing the range of a football field or two worth of range.. thank you for this instruction video!!
Yes it would scale to 2.4GHz. However, making it smaller for the same frequency is not possible. I do have XFire Pro which is a very small 900MHz antenna (less than 3" long). I also have one for 2.4GHz.
I don't know who is the hold up or if there is one. It is very possible TBS decided not to pursue this. I did send them instructions on how to make them through a messenger, but haven't bothered to check up on it.
@@northernflyer5311 No, but good instructions for building a sleeve dipole for crossfire have been shared on Facebook. It's really not a great fit for video format, I'm afraid.
Please help me, what will be my length of antenna if my desire frequency to use is 629.143Mhz also the length of RG142. thank you in advance. it will help me a lot to my project.
Hi Alex, will you be selling these (with UFL connector)? Just today setup my crossfire nano diversity Rx with 2 immortal T’s on a long ranger. Would prefer to not drag the bottom of my vertical mounted antenna...
What’s up Alex!! Dude... I hated FPV until I found your products years ago. I have always told people just buy IBcrazy or your an idiot. I took a break but I’m back with a vengeance and I have long range wing dreams for where I live in CA. Should I go analog or DJI??? I’m ready for an upgrade but don’t know wether I should go DJI or HDO2 with crossfire
The antenna will simply run out of balance causing the cable to resonate. How detrimental that is will depend on your cable length and how much air gap is left inside. Worst case scenario, your range is reduced to 20%.
@@highervoltage5430 is there any permanent effect after all antenna lengths are heated up? for example I have 1 antenna but I took the wrong example like the second way (heating all lengths), what should I do? better buy new or use this antenna by repeating the correct steps (like the first step)?
Why would I do this? Isn’t an antenna that I purchase from VAS just as good if not better? I’m all for saving a little $$$, but really? Isn’t something I buy a lot more durable?
I actually have no intention on making these, but I am sure TBS would do it. Manufacturing in the USA is simply too expensive and in it's current form is too ugly to be a commercial product.
1.21. Too many thoughts in my head when I shot the video and if I am being honest, was too lazy to re-shoot that section from such a small error in speech.
![☀ Делаем крутую антенну своими руками: инвертированный VEE диполь [Vee Dipole DIY]](/img/1.gif)
Great tutorial Alex. I made one about 2 months ago and it works great. I would only suggest on this type of tutorial to ZOOM IN REALLY CLOSE because many people have no experience stripping, removing shielding, etc from coax. and will end up cutting through the outer jacket, the shield and sometimes thru the inner jacket .
I didn't think about that. You can clearly see it if you change the video mode to HD, though.
Legend, Thanks Alex
I’ll just waiting till tbs sells them!!
Those work great been doing that for a few months now thanks Alex
Thanks Alex, very useful tutorial, will try this.
I think it's more easy talk in millimeters. Thanks for you video
Except in my country you cannot get a tape measure in mm... I hate the Imperial system but I am stuck with it.
Not doubting you, but at the end of the video when you demonstrated the poor SWR after shrinking the base end of the antenna, it isn't a valid comparison when it was done on a different antenna. Great video though, this is exactly what I was looking for. I have a 2.4GHz FlySky Flit10 receiver that uses one of these dipole antennas, so I went looking for a 900MHz design, and landed here! So thanks
Hi, thanks for the informative. May i ask, would this also apply for the stock TBS CROSSFIRE MICRO RX ANTENNA? I mount it on a L shape fashion on my quad, securing the active element and ground element on 2 separate zip ties before i put heat shrink on them. Do i need to take precaution to ensure there is an air-gap for the ground element in the heat shrink, just like your example as well?
this is so awesome!.... can i have an ibcrazy firmware update for my brain?
As always...great video!
headline: make antenna, reflex: click on video
Blows my mind that TBS is not selling a good alternative to the Immortal T for vertical mounting.
Quick question.. So if you just added a small copper down plane wire at the solder joint (Like the original CF antennas) how is this antenna better? In search of knowledge :)
I am not certain what you mean. I am not familiar with the original CF antennas.
DESPERATLY NEED A CLOSEUP VIDEO OF THIS!!! Pleeeeeeease!
What do you need a close up? I can Email you a photo. If you press the "HD" button on You Tube, you should be able to get enough definition. If not, You Tube "might* let me edit it and add photos.
Is the TBS Crossfire Tuned TX Antenna the same thing that I can just buy?
Above my patients level ... can I just buy one from you? Or is this in the works depending on the demand...
🥃cheers🍻
me to please
Right!
🥃cheers🍻
What is the math behind the design. I would like to try building this for a lower and higher frequency. I have built these as described and they work great on my meshtastic nodes.
It's actually really complicated. The issue is the permitivity of the grounded element or more specifically, the air gap under it. The gap needs to be 1/4 wavelength accounting for this effect. Also, the larger the spacing between the cable and the grounded element, the stronger the choke effect is.
Could I cut the lead coax of let's say a 2.4G moxon to make a shorter, compact antenna? Would it mess up the tune?
great vid. question: does it need AIR in the air gap area or separation? could non-shrinkable piece of tubing or tpu be used to create a gap that doesn't need to be air filled? I'm thinking about long term durability, after repeated flexes or exposure to heat etc.
If there is anything but air, the counterpoise length would need to be changed to accommodate the change in dielectric speed. In all honesty, the durability of this is probably more than adequate in the long term. However, if you have a suggestion on what else that could be filled with, I could certainly research it for you and give you new dimensions to make it work.
@@CAGreve1231 what I was thinking was some sort of a 3d printed tpu tube, which had a small eyelet on it to let it be bolted down to a top plate or around a standoff, so the sma wasn't the mounting point.
if you were to suggest inner and outer dimensions and a length I'd be happy to whip up a stl to try out...
I am not sure how to explain this because it isn't easy to describe through text, but I will try:
Anything underneath the counter element (braided shield) changes the velocity of propagation in the chamber it creates with the coaxial cable. The reduction in speed depends on the relative permitivity of the material and the % fill of that material.
So I guess it would depend on how the TPU part was made, how much infill was used, and how far up the cable it went. If you made it solid, then I would make an educated guess that the length of the shielded portion would be ~2.4" by my best guess. However, you would also need to adjust the feedpoint, too. THus you would need about 1/2" of exposed shield (where I had ~3/16") on the cable BEFORE the added braid. This should give you a decent balun and resonance.
I am happy to experiment with this if you like. If you design it, I can 3D print the part and test. I will give you full credit for the work in the video, of course.
@@CAGreve1231 I totally understand your point that it would affect the rest of the measurements. the goal for me would be to find a balance where the antenna performed as well as possible, and was easily mountable without putting strain on the sma connection, durable and did not start to lose efficacy after repeated flexings or bending that might change an air gap. or accidental exposure to heat, or anything else that might change the air gap. maybe it's an unnecessary exploration but it seems like an interesting one, and I like the idea of this antenna a lot.
Silly question but how come it’s on the kwad? And not on the controller? How do I make one for my kwad? I’m doing the immortal L??
The TBS Tuned antenna is very similar and goes on your radio.
Video Aerial Systems I’m kinda confuse on how this goes to the tbs receiver on the kwads
@@sk8rix24 - This style is for use with an extension cable for frame mounting. Use a u.fl connector on RG178 for connection to the receiver.
would this work for the TX as well? I would think so but, not 100% sure
Dear Sir, What is the best antenna for TBS Crossfire the diamond or the tuned one ? what is the difference between them?
Was the tuned one made by VAS also?
I don't know who designed the tuned antenna. My favorite antenna is the Shapeshifter. It is an adjustable gain diamond for the same price.
If i need a bit of rigidity? Would it be ok to ad a (correct diameter) “forever tube” on the bottom half? Of course keeping the air gap but adding rigidity to the lower half of the antenna....??? Or will that screw up the quality???
You could use a straw or something in place of the heatshrink tubing, yes.
Hey Alex!! Do you know how well this scales down? Do you think it would be effective to build an antenna for a micro lightweight build, taking it down to 3” or or even 1.5”? I’m talking about needing the range of a football field or two worth of range.. thank you for this instruction video!!
Yes it would scale to 2.4GHz. However, making it smaller for the same frequency is not possible. I do have XFire Pro which is a very small 900MHz antenna (less than 3" long). I also have one for 2.4GHz.
man, we've had a tutorial for this for the better part of a year now, what we need is for TBS to sell them. What's the holdup?
Probably too many irons in the fire if you ask me. I actually explained to them how to make this 9 months ago.
@@CAGreve1231 So you're saying it's Trappy's holdup, not yours?
I don't know who is the hold up or if there is one. It is very possible TBS decided not to pursue this. I did send them instructions on how to make them through a messenger, but haven't bothered to check up on it.
Hey Benson, you made a video of this? Can you share a link?
@@northernflyer5311 No, but good instructions for building a sleeve dipole for crossfire have been shared on Facebook. It's really not a great fit for video format, I'm afraid.
Please help me, what will be my length of antenna if my desire frequency to use is 629.143Mhz also the length of RG142. thank you in advance. it will help me a lot to my project.
Antennas scale very well. Simply follow this formula:
Your length = design length * (design frequency/your frequency). It is actually that simple.
@@CAGreve1231 How do I know my design length and design frequency?
@@morsnicolas8738 - You calculate your length from your frequency (629.143 MHz) and the length and frequency of my design in the video.
Alex.....could I find a copper tube that's 3" and the same diameter as the outer braided shield? Kind of like the diopole antennas that FlySky uses.
Yes. That would work well.
Hey Prophet, did you make it? how was the performance? I wanna try using the copper tube.
@@fabpr89 Didn’t bother to make one. Just bought an ORT Moxon v3 from RDQ.
I don't get it. if the air gap is that important, why couldn't we just insert a roll of paper or a few strip of electrical tape?
Adding material changes the velocity of propagation and would change the effective length.
Thanks. So actually a metallic tube would be better that keeps the shape and spacing. If weight is not an issue.
Anyway to get better range on a mavic Mini?
Where do I learn more?
Hi Alex, will you be selling these (with UFL connector)? Just today setup my crossfire nano diversity Rx with 2 immortal T’s on a long ranger. Would prefer to not drag the bottom of my vertical mounted antenna...
I don't intend to sell these at all as I have too many other projects I need to finish. This is more of a DIY project I wanted to share with others.
Video Aerial Systems cool, thanks
👍👍
What’s up Alex!! Dude... I hated FPV until I found your products years ago. I have always told people just buy IBcrazy or your an idiot. I took a break but I’m back with a vengeance and I have long range wing dreams for where I live in CA. Should I go analog or DJI??? I’m ready for an upgrade but don’t know wether I should go DJI or HDO2 with crossfire
Analog rules for long range. The DJI system is awesome, but it has some serious problems when it comes to long range flying.
Video Aerial Systems thank you!!
what happened if I heat all heatshrink like 2nd way then i change the shrink like 1st way? or maybe i have to make another antenna again?
The antenna will simply run out of balance causing the cable to resonate. How detrimental that is will depend on your cable length and how much air gap is left inside. Worst case scenario, your range is reduced to 20%.
@@highervoltage5430 if I have preheated all the antenna lengths, is it better to buy a new antenna or start over?
@@highervoltage5430 is there any permanent effect after all antenna lengths are heated up? for example I have 1 antenna but I took the wrong example like the second way (heating all lengths), what should I do? better buy new or use this antenna by repeating the correct steps (like the first step)?
@@SmudgeFPV - Can you just cut away the heatshrink and re-apply it?
@@highervoltage5430 yes I can
What's a recommendation for people who want to use u.fl?
RG178 cable as long as you need ;)
Why would I do this? Isn’t an antenna that I purchase from VAS just as good if not better? I’m all for saving a little $$$, but really? Isn’t something I buy a lot more durable?
because u can do it as long as u needwith for example uFl connector instead of dampening SMA :)
I actually have no intention on making these, but I am sure TBS would do it. Manufacturing in the USA is simply too expensive and in it's current form is too ugly to be a commercial product.
👍
21.21 SWR ? Wut ?
1.21. Too many thoughts in my head when I shot the video and if I am being honest, was too lazy to re-shoot that section from such a small error in speech.