Support me on Patreon: www.patreon.com/user?u=20857330 My eBay store: www.ebay.co.uk/str/andrewante... Facebook group: / 1313077415524264 Email: andrewantennas@gmail.com
You should try it. It seems that the result depends on lots of factors. Personally I was surprised. I've assembled the antenna from some rubbish on my backyard. With the antenna I've got significant improvements in connection (though I have 3g antenna but not wifi one)
Wow ...when I saw the original video I thought exactly what you said. It is short circuited dipole. Then your video appeared in my tablet and you really explained the bad thing to that design. Only for a recomendation...I would use copper board and etched the center so there will not be a conection to the ground plane and reflectors. In order to achieve the long range of 3 km they will need and amplifier and a duplexer. If you or someone have a schematic or a design I would love to see it. There is a video where someone took a crystal from a old mobile to use it as a filter ....it will be interesting to see the modified gun with an amplifier and test the performance and gain....thanks for the video. I loved your scientific approach to the subject. Regards...
Very interesting. Thank you. The only practical way to get things like this working correctly is to measure the VSWR. There are other ways but this is the easiest , simplest and cheapest so far as I know.
Thank you for taking the time to make this video! Regarding the original video I was also wondering if there's any merit to the way the phone's antenna got connected to the "wi-fi gun'', I mean that repeating bending of the signal wire at 90 degrees to form something like a spiral?
hi Andrew, thanks for this. I've always been interested in the "how and why" so I have a few questions: 1) do the plates need to be copper? is the conductivity of copper a benefit? 2) you say you've isolated the main plate but they are still attached by that wire? 3) maybe a bit off topic but I have two channel master tv antenna mounted on a mast, one above another. They are on a 30 degree angle from each other (I've experimented with them parallel and up to 90 degrees to each other. 30 degrees seems to work best) Each one is about 2x2ft so I have about 8 SF aiming in the direction of the sources, whereas a yagi design has very little frontal area but perhaps has more of a chance to lock the signal since its longer and deeper. Which is a better set up? thanks.
I was thinking they should be isolated, but i have also seen many antennas that when tested under DC current will appear as a dead short...cannot say which they used, but under your practical test, it was at least shown to work BETTER when the driving element was isolated. I like it when people independently test stuff that people post as being the next best thing since cold fusion.
so, if i may know... which design do you like the most?this one, cantenna, or bi-quad parabolic? cause i'm lil bit confused to decide which design i'm going to build.
I saw the video you are talking about and I knew there was something not right but couldn't think what until you put it right here. You may have saved my router's life! LOL
Thanks for the detailed video. I would live to build an antenna and have done a fair amount of research and always got confused when it came to the elements. Out of curiosity, the video you're referencing bent the end of the wire into a square spiral and held it near his phone to increase the wifi range of his phone. Is that possible?
Could someone please make a list of all the materials/best materials to make one of these and their measurements? I'm thinking of creating one for a little project to keep me occupied, it would help a lot, please and thank you. EDIT: It would also be helpful to know how to attach it to a router, please.
Not forgetting a 50ohm termination is probably more important. Testing the driven element to Director with s DC multimeter is not a valid argument. It's whether it presents a true 50ohm load. Look at a folded J pole antenna. It's a DC short with an infinite impedance at the antenna tip. However the 50ohm feed is near the bottom of the antenna and a DC short. In technical terms a transformer is a DC short however it's not to AC, ......RF is AC. Ok it's true your not going to get far with the driven element shorted in this way however I think the fundamentals of antenna design need exploring a tad more. Example your average Sky dish has an antenna about 15mm but its nestled inside the feed horn (can-tenna). Ultra directional however has a range of hundreds of miles potentially. Why not check the reactance, do a little J notation. 2m EME is a round trip of 750,000km and 23cm EME. Since 2.4ghz is in the 13cm band the potential for 10,000 miles is achievable IF both designs are capable. Having an excellent antenna at one side and the other possibly using a vertical to your circular polarisation antenna is 30db down perhaps as much as 60db. Build the design again and test the pair pointing at each other. Measure the thermal background noise and run this video again. Or Google 13cm EME www.vk3nx.com/13cm.html
Just a comment....the so called gun antenna is like the one used for comertial MDS television cable. The elements are circular because the used polarity either vertical or horizontally. In that way the waves are reflected in any position...that is another problem because if you have a transmission where they used separated transmitters your gun will peek both and interfere with each other. So that is the reason where a bow tye antena correctly oriented will work as well. But with respect to the impedance referred a 50 ohm....since we are talking about high frequencies here and probably people here doesn't realice that these things should be designed as transmission lines using what is called a Smith chart and a process called matching the impedance seen at that frequency....this is not an easy stuff to be explained here unless you have seen the problem as a transmisión line. With this I just want to say is not to put a 50 ohm terminator plug....the antenna should be matched to a certain frequency to get the most possible gain. But considering this is a WiFi transmission where they used many channels and in your wifi router you may specify which one to use , the you should take the consideration to cut the dipole dish diameter acording to resonate a that frequency . I think they use 1/4 lamda for that. Kind like the dipole on the LNA of the parabolic dishes used in the 80's. So forget about 50 ohms terminators and design the size of the dipole cutted to that channel frequency. Or forget what all of this discussion I just mention....😊
friend, I just saw your video ... 7 months later you can tell me please if the antenna works or not, I have a serious reception problem and I want your opinion. Thank you.
Hi just wanna know if i can substitute bronze plate with a cardboard coverd flat with aluminum foil? Since theres enhanced community quarantine here hardware shops are closed. Im tryna reach a wifi rent from a distance. Thats why i wanna try this so that i dint need to go out just to have a wifi connection Please reply
Question. Why is it that on a yagi antenna it's ok that it is shorted on the drive element?, ... and why are some yagi's parasit elements not connected together. I always want it to be like how you modify this.
Mr. Andrew Can you make a video where you explain necessary measurements for a Cantenna ? For example I have a Can with 10 cm diameter but need precise measurements (Can's length, where to put the driven element.....) I hope you do it please!!
i'm not andrew ( his smacking when he talks bugs the piss out of me) however i can give you this: archive.oreilly.com/pub/post/antenna_on_the_cheap_er_chip.html their is a part list as well as directions. :)
i was thinking of making this one but i would like to do it with my Xiaomi Mi Wifi Repeater Pro but its antenna is built to it (unlike from the video that you can disassemble or remove the amtenna). Would it be fine if sattelite/cable tv wire is Twiddled to the repeater antenna directly? can i get signal with that (of course with the same directional antenna design) please i hope and ill be very glad if someone read this and answer my question. (sorry for the wrong grammar)
can u make a detailed video on how to make it just like that, pls my wifi is very bad from 75m away, if u could please list the things u used and the lengths and widths of the items thank u
Its perfectly possible to have a DC short on a good antenna(PIFA or slot antennas as an example). Its the impedence at the frequency of operation that matters. Clearly isolating on this improves the match, but it isnt a universal rule.
The problem is when connecting to an output that has any DC bias for driving an external amplifier. Any antenna that is a DC short will damage the output.
My question is... I notice the copper plates are isolated between the wires.. or seperate. but wouldnt the bolt and nuts cause interference? Do the 2 main non parasitic plates need to be insulated from the rod>?? or does it not matter
This is a Yagi antenna but can this be made polarized ? Rh or LH polarized. This is in connection with using this antenna for the current EsHail satellite. It needs a RHCP signal
When we go South to avoid the frigid winters of the South Dakota high plains, we stay at a nice little rv park in a tiny Arizona town near Needles California. They furnish wifi but it is slow and not at all reliable. I finally decided to buy a sort of booster, and that helps a quite a bit, but since it is inside our RV, which is made up of steel 2x4's with fiberglass body, a lot of signal is lost. I have been looking at hooking up a small outdoor antenna and runing it into our RV then hooking it up to a twin antenna router to be rebroadcast in the unit. Would this antenna design be OK? I did find a yaggi antenna and purchased it a few years back, but have not hooked it up as of yet because I did not have proper cabling capability. It came with some sort of coax but I am not sure exactly what it is, not 50 ohm or cable tv, someplace in the middle. The seller said they had it mounted on a sky scraper window ledge and used it to transfer files from one building to another some distance away, but had upgraded.
Wow Salute to you Andrew. I cant believe you followed up on this antenna. Great Job PS: Does this antenna beat your double biquad in gain or is that still your bread and butter antenna?
Hello Sir. Could you please mention the cotrect size of each circular plates, distance size between plates, thread bar size n lenghth etc. Thanks for your help and support 👍
Too funny, I just watched their vid late last night... and I immediately thought of you. It would be interesting to test on your equipment against your compact yagis.
The antenna needs to be 50 ohm for communication. But Reference antenna conductive and it 0 ohm resistance. Internal impdance of IC 50 ohm and the antenna has to be 50 ohm for the maximum power transfer.
NO, the driven element is shorted to the boom at DC only, but not at RF. This is the same with all the elements, the centers of them are all at minimum current points, so the only difference between grounding them or floating them should depend on how far from resonance the measurements are, including any velocity factors. If they are at the perfect lengths and spacings, their zero current points do NOT see the booms at RF frequencies.
hi very nice info. please tell me does biquad antenna is damage the wifi adapter too because it is also soldered both end of coaxial cable on biquad antenna. sorry for my bad english. i am just learner.
Could I take something like this or the cantenna and hook it up to my drones controller and get longer range with it? ? I have a phantom 3 standard and it uses 2 different wifi signals I believe. One for video and one for the controls.
I also built one and couldn’t get it working I think there needs to be rubber in between each copper ring and the boat they’re attached to is steel that has way to much resistance. Solder a small wire to each individual plate through a hole drilled close to the bolt and you can use a plastic bolt but either way, I feel the steel bolt is slowing the flow of signal to be cut from Wi-Fi. Small wires for small voltage right? My theory is too much resistance in the steel stop the flow of signal from Wi-Fi
Great video. I have just made one today:) I have set the first 3 Only 10mm Apart & then 32mm to the 4th one at 38mm. I have just done a quick test on my phone & the results are very good. My phone on its own only picks up x2 Direct Wi-Fi Signals & x7 Normal Wi-Fi Signals. When I attach the Gun I'm getting X7 Direct Wi-Fi Signals and x18 Normal Wi-Fi Signals. I'm trying to connect to my local Mc Donald's:) Sometimes you just have to try these things out to see if they work:) Great video.
I made similar antena and connect it to router with original three antennas. I disconnected one original antenna and connected this wifi gun antenna. There was no difference in signal range. So not working.
Excuse me sir.. i'm from indonesia. Today, i make this antenna and dimension is calculated by cantennator apps on android. My question is : how connection between boom and driven? Shorted or isolated? Because i'm confuse about 2 methods. Using NanoVNA, so far result is equal for SWR and impedance. Thanks
hello sir andrew i actualy made the wifi gun it works in very short distance. i did not get the signal of my target wifi source. perhaps you can share to me were can i buy a better wifi gun that has long range of getting signal. im tired and frustrated already . thanks
I am trying to receive my Wifi signal from my main house to our second house on the farm. No trees and no interference to my cell phone . How do I do this ???
Due to the construction, the cable appear to be of a certain resistance. This is due to the self capacitance and inductance. Take an infinitelly long wire, connect a power source, and it will seems like it is a 50 ohms resistor. Take a shorter one and you get the 50 ohms until the electricity reach the end, then it go open circuit. Any change of impedance cause part of the signal to bounce back. The transmitter expect a 50 ohms load and get a 75. Part of the signal then bounce back in the transmitter. You now have a few things that happend. First only part of the power goes in the wire. Then the reflected signal goes back in the transmitter, which now have to fight it. This cause the transmitter to heat more, and to deform the signal due to the overload. Then the signal hit the antenna, which appear to be a certain impedance at a certain frequency. Again, if the construction is wrong, the impedance will not match the cable, and part bounce back, and you get even less signal out, plus that signal bounce back to the wifi card, part bounce again there toward the antenna, part continue and hit the transmitter, which heat more and deform the signal more. All that signal deformation cause some signal issues... Look up for cable impedance, antenna impedance and signal impedance matching. RF is kinda like black magic. It do not do quite what you expect it to do. ... Also, did you knew that the electricity do not use the center of the conductor? But only 1.3µm at 2.4GHz. Google for skin effect (quickly, as the frequency raise, the electrons tend to flow only on the surface of the conductor, leaving the middle with little or no flow).
mismatch loss for 75/50 Ohm is not as big and given that 75 Ohm cables have generally lower attenuation it might be advantage to use them in low power systems. But yes, it depends on particular circumstances and it is good to know what you do.
Hello I am trying to make a wifi connection thru townhouses thats around 600-700 meters away. Don't have line of sight but there is no obstruction, not perfect. Only dealing with rooftops of 2-3 stories. You suggest a parabolic or maybe I can try the wifi gun.
you referred to the largest disk as a reflector and the second to largest disk as a driver. What if you isolated the reflector instead of the driver disk? And what if you did that by switching the wires going to the disks, either like either with the driver disk isolated and then again, instead, with the reflector disk isolated?
hello! i saw many biquad and double biquad antenna designs you tested,from your experience wich reflector is best,flat or curved?wich one have more gain?
can someone explain the physic behind this antenna? why and how do the diameters and spaces in between the plates matter? wouldnt that only be important for transmitting? why is it important for receiving? a satelite dish receives perfectly and its built with just a big backpiece to catch the waves right?
@@rawtec77 of course i will. but its important to share knowledge so why dont you just explain it to me or post a link to a helpful website? gaining knowledge ad helping others to do so should be natural for eveybody
Can someone please help me how does the materials help for this project ? or like any explanations on how the signals are being in range for the device im really having difficulties on following i mean I know that this tool works but i dont know how it works if anyone could help me please do Im currently having homework research on DIY and I found this as an awesome creation so if anyone could fill in the details please do. thank you
The other vid was outdoors in a rural area that's how they got the 5km. In your vid you're indoors. So what your saying is it does work and it works best under 5km.
if you really need a narrow beam as possible you should use a dish, like a 60cm dish , it can be a mesh one too. many designs around to use as the feed in the focus point, even a cantenna , depending is also if the dish is a prime focus or a offset dish.
highflow highflow true, a large dish would be good but I missed out the need for it to be easily steerable. Also by narrow beam width I'm thinking something around 1° in both azimuth and elevation.
Good video Andrew. Very interesting. Obviously the modified version is the go. At a rough guess looking at the scan results, what dBi do you think the original and modified antennas are each achieving ? Cheers Rob
Наука
Good video Sir.Andrew. i'm excited to see you bulid your own version and design of this type of antenna
I hope you'll also test his 3G/4G version. And I'm really curious about what he calls capacitive coupling and if it really works.
No it does not work but you can find people selling them online. Not sure if that part of the video was a joke lost in translation.
@@andrewmcneil It went over my head! Cheers for the info :)
You should try it. It seems that the result depends on lots of factors. Personally I was surprised. I've assembled the antenna from some rubbish on my backyard. With the antenna I've got significant improvements in connection (though I have 3g antenna but not wifi one)
Wow ...when I saw the original video I thought exactly what you said. It is short circuited dipole. Then your video appeared in my tablet and you really explained the bad thing to that design. Only for a recomendation...I would use copper board and etched the center so there will not be a conection to the ground plane and reflectors. In order to achieve the long range of 3 km they will need and amplifier and a duplexer. If you or someone have a schematic or a design I would love to see it. There is a video where someone took a crystal from a old mobile to use it as a filter ....it will be interesting to see the modified gun with an amplifier and test the performance and gain....thanks for the video. I loved your scientific approach to the subject. Regards...
Thank you for sharing your knowledge and for the experiments!
Very interesting. Thank you. The only practical way to get things like this working correctly is to measure the VSWR. There are other ways but this is the easiest , simplest and cheapest so far as I know.
Thank you for taking the time to make this video!
Regarding the original video I was also wondering if there's any merit to the way the phone's antenna got connected to the "wi-fi gun'', I mean that repeating bending of the signal wire at 90 degrees to form something like a spiral?
hi Andrew, thanks for this. I've always been interested in the "how and why" so I have a few questions: 1) do the plates need to be copper? is the conductivity of copper a benefit? 2) you say you've isolated the main plate but they are still attached by that wire? 3) maybe a bit off topic but I have two channel master tv antenna mounted on a mast, one above another. They are on a 30 degree angle from each other (I've experimented with them parallel and up to 90 degrees to each other. 30 degrees seems to work best) Each one is about 2x2ft so I have about 8 SF aiming in the direction of the sources, whereas a yagi design has very little frontal area but perhaps has more of a chance to lock the signal since its longer and deeper. Which is a better set up? thanks.
I was thinking they should be isolated, but i have also seen many antennas that when tested under DC current will appear as a dead short...cannot say which they used, but under your practical test, it was at least shown to work BETTER when the driving element was isolated. I like it when people independently test stuff that people post as being the next best thing since cold fusion.
so, if i may know... which design do you like the most?this one, cantenna, or bi-quad parabolic?
cause i'm lil bit confused to decide which design i'm going to build.
4:36 to bypass the yacking and to get started.
Thank you.
THANK YOU!!
Also. In NONE of the tests did he try to move the focal point to tune into the target. This is just bunk show.
Excellent!!! I Iook forward to seeing your design.
The antenna is actually narrowband (narrow range of frequencies) so WiFi download and upload speeds will be different.
FDD (Frequency Division Duplex) uses separate frequencies
I saw the video you are talking about and I knew there was something not right but couldn't think what until you put it right here. You may have saved my router's life! LOL
I have a question if i can use PCB boards to build the antenna
Thanks for the detailed video. I would live to build an antenna and have done a fair amount of research and always got confused when it came to the elements. Out of curiosity, the video you're referencing bent the end of the wire into a square spiral and held it near his phone to increase the wifi range of his phone. Is that possible?
Same question bro
Hi
Would just like to know when you mentioned Office Repeater, just how far away is that from your location?
Thanks in advance
Great info. Do You have recommendation DIY WIFI Such as this one?
Could someone please make a list of all the materials/best materials to make one of these and their measurements? I'm thinking of creating one for a little project to keep me occupied, it would help a lot, please and thank you.
EDIT: It would also be helpful to know how to attach it to a router, please.
Not forgetting a 50ohm termination is probably more important. Testing the driven element to Director with s DC multimeter is not a valid argument. It's whether it presents a true 50ohm load. Look at a folded J pole antenna. It's a DC short with an infinite impedance at the antenna tip. However the 50ohm feed is near the bottom of the antenna and a DC short. In technical terms a transformer is a DC short however it's not to AC, ......RF is AC. Ok it's true your not going to get far with the driven element shorted in this way however I think the fundamentals of antenna design need exploring a tad more. Example your average Sky dish has an antenna about 15mm but its nestled inside the feed horn (can-tenna). Ultra directional however has a range of hundreds of miles potentially. Why not check the reactance, do a little J notation. 2m EME is a round trip of 750,000km and 23cm EME. Since 2.4ghz is in the 13cm band the potential for 10,000 miles is achievable IF both designs are capable. Having an excellent antenna at one side and the other possibly using a vertical to your circular polarisation antenna is 30db down perhaps as much as 60db. Build the design again and test the pair pointing at each other. Measure the thermal background noise and run this video again. Or Google 13cm EME
www.vk3nx.com/13cm.html
CodfishCatfish
I agreed , the feed point must be near the center to "try" to match 50 ohms .
Just a comment....the so called gun antenna is like the one used for comertial MDS television cable. The elements are circular because the used polarity either vertical or horizontally. In that way the waves are reflected in any position...that is another problem because if you have a transmission where they used separated transmitters your gun will peek both and interfere with each other. So that is the reason where a bow tye antena correctly oriented will work as well. But with respect to the impedance referred a 50 ohm....since we are talking about high frequencies here and probably people here doesn't realice that these things should be designed as transmission lines using what is called a Smith chart and a process called matching the impedance seen at that frequency....this is not an easy stuff to be explained here unless you have seen the problem as a transmisión line. With this I just want to say is not to put a 50 ohm terminator plug....the antenna should be matched to a certain frequency to get the most possible gain. But considering this is a WiFi transmission where they used many channels and in your wifi router you may specify which one to use , the you should take the consideration to cut the dipole dish diameter acording to resonate a that frequency . I think they use 1/4 lamda for that. Kind like the dipole on the LNA of the parabolic dishes used in the 80's.
So forget about 50 ohms terminators and design the size of the dipole cutted to that channel frequency. Or forget what all of this discussion I just mention....😊
Thanks for this, I was wondering why the other videos I saw seemed to short out the cable.
friend, I just saw your video ... 7 months later you can tell me please if the antenna works or not, I have a serious reception problem and I want your opinion. Thank you.
how do you hook it up to your computer and if the main dish is to be isolated from the rest why do you need the other dishes?
Hi just wanna know if i can substitute bronze plate with a cardboard coverd flat with aluminum foil? Since theres enhanced community quarantine here hardware shops are closed.
Im tryna reach a wifi rent from a distance. Thats why i wanna try this so that i dint need to go out just to have a wifi connection
Please reply
Hi, great video as always! Have you ever considered making an "antenna basics" showing the physical principles behind antenna design?
so since a cantanna has about 10 to 12dBi antenna gain, the improved "wifi gun" has aprox. the same gain of 12dBi?
Question. Why is it that on a yagi antenna it's ok that it is shorted on the drive element?, ... and why are some yagi's parasit elements not connected together. I always want it to be like how you modify this.
I have been looking for a good Wi-Fi antenna that only needs to connect with my router that is only 350 feet away. Do you know of one that I can buy?
Please I wonder, if the distance between all discs is the same 30mm? what about disk 90 and 68? thanks
Mr. Andrew Can you make a video where you explain necessary measurements for a Cantenna ? For example I have a Can with 10 cm diameter but need precise measurements (Can's length, where to put the driven element.....) I hope you do it please!!
i'm not andrew ( his smacking when he talks bugs the piss out of me) however i can give you this: archive.oreilly.com/pub/post/antenna_on_the_cheap_er_chip.html
their is a part list as well as directions. :)
i was thinking of making this one but i would like to do it with my Xiaomi Mi Wifi Repeater Pro but its antenna is built to it (unlike from the video that you can disassemble or remove the amtenna).
Would it be fine if sattelite/cable tv wire is Twiddled to the repeater antenna directly? can i get signal with that (of course with the same directional antenna design)
please i hope and ill be very glad if someone read this and answer my question.
(sorry for the wrong grammar)
can u make a detailed video on how to make it just like that, pls my wifi is very bad from 75m away, if u could please list the things u used and the lengths and widths of the items
thank u
Thanks for testing that for us, good video.
Its perfectly possible to have a DC short on a good antenna(PIFA or slot antennas as an example). Its the impedence at the frequency of operation that matters. Clearly isolating on this improves the match, but it isnt a universal rule.
The problem is when connecting to an output that has any DC bias for driving an external amplifier. Any antenna that is a DC short will damage the output.
My question is... I notice the copper plates are isolated between the wires.. or seperate.
but wouldnt the bolt and nuts cause interference?
Do the 2 main non parasitic plates need to be insulated from the rod>??
or does it not matter
This is a Yagi antenna but can this be made polarized ? Rh or LH polarized. This is in connection with using this antenna for the current EsHail satellite. It needs a RHCP signal
great video, as is the reference video it discusses, and the comments below; They all show what a complex field this really is!
Can you provide pdf for this yagi antenna with your suggestions ?
Is this saport 2.4ghz WiFi?
When we go South to avoid the frigid winters of the South Dakota high plains, we stay at a nice little rv park in a tiny Arizona town near Needles California. They furnish wifi but it is slow and not at all reliable. I finally decided to buy a sort of booster, and that helps a quite a bit, but since it is inside our RV, which is made up of steel 2x4's with fiberglass body, a lot of signal is lost. I have been looking at hooking up a small outdoor antenna and runing it into our RV then hooking it up to a twin antenna router to be rebroadcast in the unit. Would this antenna design be OK? I did find a yaggi antenna and purchased it a few years back, but have not hooked it up as of yet because I did not have proper cabling capability. It came with some sort of coax but I am not sure exactly what it is, not 50 ohm or cable tv, someplace in the middle. The seller said they had it mounted on a sky scraper window ledge and used it to transfer files from one building to another some distance away, but had upgraded.
Can you combine an open dipole bow tie style antenna with a cantenna?
Would really love to see that in a video!!
Would this concept work for cell phone signal? Here I get 1800MHz and I´m tryng to get signal here in a rural area
Wow Salute to you Andrew. I cant believe you followed up on this antenna. Great Job PS: Does this antenna beat your double biquad in gain or is that still your bread and butter antenna?
How would using an insulated boom such as a wooden dowel affect the antenna?
Hello Sir. Could you please mention the cotrect size of each circular plates, distance size between plates, thread bar size n lenghth etc. Thanks for your help and support 👍
can you show us how did you modified it ? i didnt understand where did you put the heat tube
Too funny, I just watched their vid late last night... and I immediately thought of you. It would be interesting to test on your equipment against your compact yagis.
The antenna needs to be 50 ohm for communication. But Reference antenna conductive and it 0 ohm resistance. Internal impdance of IC 50 ohm and the antenna has to be 50 ohm for the maximum power transfer.
NO, the driven element is shorted to the boom at DC only, but not at RF. This is the same with all the elements, the centers of them are all at minimum current points, so the only difference between grounding them or floating them should depend on how far from resonance the measurements are, including any velocity factors. If they are at the perfect lengths and spacings, their zero current points do NOT see the booms at RF frequencies.
hi very nice info. please tell me does biquad antenna is damage the wifi adapter too because it is also soldered both end of coaxial cable on biquad antenna. sorry for my bad english. i am just learner.
The biquad element is not connected to ground, Ground is connected to the reflector
Yes you are correct SJP, I let my keyboard fingers run away before engaging brain :-)
Could I take something like this or the cantenna and hook it up to my drones controller and get longer range with it? ? I have a phantom 3 standard and it uses 2 different wifi signals I believe. One for video and one for the controls.
Это узконаправленная антенна, учи матчасть.
I also built one and couldn’t get it working I think there needs to be rubber in between each copper ring and the boat they’re attached to is steel that has way to much resistance. Solder a small wire to each individual plate through a hole drilled close to the bolt and you can use a plastic bolt but either way, I feel the steel bolt is slowing the flow of signal to be cut from Wi-Fi. Small wires for small voltage right? My theory is too much resistance in the steel stop the flow of signal from Wi-Fi
Great video. I have just made one today:) I have set the first 3 Only 10mm Apart & then 32mm to the 4th one at 38mm. I have just done a quick test on my phone & the results are very good. My phone on its own only picks up x2 Direct Wi-Fi Signals & x7 Normal Wi-Fi Signals. When I attach the Gun I'm getting X7 Direct Wi-Fi Signals and x18 Normal Wi-Fi Signals. I'm trying to connect to my local Mc Donald's:) Sometimes you just have to try these things out to see if they work:) Great video.
Why does the coax antenna touch the back reflector AND the main driven element?
I want to connect to my university which is 1km away ( straight line ) with 5Ghz AC wireless card. what would you recommend ?
Hello.
I want to know how many millimeters is the thickness of that copper?
I need to know
Great video. Thanks for your insight. Just wondering if you have a video that shows how to connect the co-ax to a lap top? Thanks!
So does the screen of the coax connect to the reflector in this type of antenna?
Could you please explain how DC short will damage wifi card? I believe DC short has no effect on wifi card which is AC thing (RF is not DC right?)
I made similar antena and connect it to router with original three antennas. I disconnected one original antenna and connected this wifi gun antenna. There was no difference in signal range. So not working.
Hi, is aluminium sheet okay for the disks ?
Hey is your shop down right now?also any reason why you don't use Alfa036nha?just curious
Excuse me sir.. i'm from indonesia. Today, i make this antenna and dimension is calculated by cantennator apps on android. My question is : how connection between boom and driven? Shorted or isolated? Because i'm confuse about 2 methods. Using NanoVNA, so far result is equal for SWR and impedance. Thanks
hello sir andrew i actualy made the wifi gun it works in very short distance. i did not get the signal of my target wifi source. perhaps you can share to me were can i buy a better wifi gun that has long range of getting signal. im tired and frustrated already . thanks
In the original video they had 2 antennas pointing at each other would that increase the range?
excellent!!, how can i build a 5ghz wifi directional antena for rocket m5 ?
Can we buy simmalar thing for this. I dont have tools for making these?
I am trying to receive my Wifi signal from my main house to our second house on the farm. No trees and no interference to my cell phone . How do I do this ???
I am glad you readed my coment and thanks for this quick video.
The disc size can be as many wavelenghts as you wish which in this case has so many factors as to go with best guess.
Didn't the 5 Km test in the original video use directional antennas for _both_ the router and the target?
Yes but Kreosan used TV coax from the router to the antenna which is not good.
Zara Hall why not good?
TV coax is 75 ohms, while wifi use 50 ohms. Wrong impedance cause signal issue. Beside tv cable is not rated for 2.4GHz
Due to the construction, the cable appear to be of a certain resistance. This is due to the self capacitance and inductance. Take an infinitelly long wire, connect a power source, and it will seems like it is a 50 ohms resistor. Take a shorter one and you get the 50 ohms until the electricity reach the end, then it go open circuit.
Any change of impedance cause part of the signal to bounce back.
The transmitter expect a 50 ohms load and get a 75. Part of the signal then bounce back in the transmitter. You now have a few things that happend. First only part of the power goes in the wire. Then the reflected signal goes back in the transmitter, which now have to fight it. This cause the transmitter to heat more, and to deform the signal due to the overload.
Then the signal hit the antenna, which appear to be a certain impedance at a certain frequency. Again, if the construction is wrong, the impedance will not match the cable, and part bounce back, and you get even less signal out, plus that signal bounce back to the wifi card, part bounce again there toward the antenna, part continue and hit the transmitter, which heat more and deform the signal more.
All that signal deformation cause some signal issues...
Look up for cable impedance, antenna impedance and signal impedance matching.
RF is kinda like black magic. It do not do quite what you expect it to do.
... Also, did you knew that the electricity do not use the center of the conductor? But only 1.3µm at 2.4GHz. Google for skin effect (quickly, as the frequency raise, the electrons tend to flow only on the surface of the conductor, leaving the middle with little or no flow).
mismatch loss for 75/50 Ohm is not as big and given that 75 Ohm cables have generally lower attenuation it might be advantage to use them in low power systems. But yes, it depends on particular circumstances and it is good to know what you do.
Can you please share your isolated version antenna picture with me.
i think he's dumb the video is pointless nothing added
На какую частоту?
Hello I am trying to make a wifi connection thru townhouses thats around 600-700 meters away. Don't have line of sight but there is no obstruction, not perfect. Only dealing with rooftops of 2-3 stories. You suggest a parabolic or maybe I can try the wifi gun.
I would use a cantenna
What software are you using to scan with?
Is there any chance of doing a 700-850 MHz cantenna at long range?
02:16 How about a panel antenna? How would you think it performs compared to a Cantenna?
What phantom said...same reason long long extension 120amp cord developes resistance and creates heat/fail
Hey could please upload a construction guide for the parabola disc + cantenna ?
you referred to the largest disk as a reflector and the second to largest disk as a driver. What if you isolated the reflector instead of the driver disk? And what if you did that by switching the wires going to the disks, either like either with the driver disk isolated and then again, instead, with the reflector disk isolated?
hello! i saw many biquad and double biquad antenna designs you tested,from your experience wich reflector is best,flat or curved?wich one have more gain?
parabolic 👍
how can i use it. for network suply Router to android phone?
Please tell me. thank you.
What exactly did he do to isolate the main driven element? It's the entire disc isolated from everything, or...???
I like your magnetic wall mount tool holders
can someone explain the physic behind this antenna? why and how do the diameters and spaces in between the plates matter? wouldnt that only be important for transmitting? why is it important for receiving? a satelite dish receives perfectly and its built with just a big backpiece to catch the waves right?
these measures are important for specific frequencies, do your research ;]
@@rawtec77 of course i will. but its important to share knowledge so why dont you just explain it to me or post a link to a helpful website? gaining knowledge ad helping others to do so should be natural for eveybody
Can someone please help me how does the materials help for this project ? or like any explanations on how the signals are being in range for the device im really having difficulties on following i mean I know that this tool works but i dont know how it works if anyone could help me please do Im currently having homework research on DIY and I found this as an awesome creation so if anyone could fill in the details please do. thank you
The other vid was outdoors in a rural area that's how they got the 5km. In your vid you're indoors. So what your saying is it does work and it works best under 5km.
Did you finish the crosshair yagi? You definitely grabbed me on that one. I have made your other crosshair antenna
s and they work fantastic.
COPIAH COUNTY BLAMING QUICKIE YEAPO ALL IN
Can u tell me that ground and signal terminals are short
please can you send me file word or pdf of this antina
Andrew can you please post in PDF the 2.4GHz directions and materials and measurements😁
Hi! I made an extended search on the internet to buy this antenna with no luck! Would you think about selling me a pre-made and tested one andrew?
Does anyone know an antenna design that produces a very narrow beam width for 2.4ghz? I'm thinking just use a longer cantenna?
if you really need a narrow beam as possible you should use a dish, like a 60cm dish , it can be a mesh one too. many designs around to use as the feed in the focus point, even a cantenna , depending is also if the dish is a prime focus or a offset dish.
highflow highflow true, a large dish would be good but I missed out the need for it to be easily steerable. Also by narrow beam width I'm thinking something around 1° in both azimuth and elevation.
are there advantages/disadvantages to disks vs simple diploe elements?
How far is the access point exactly? 50m 100m?
What software are you using to give you the signal strengths
How are you getting away with the DC short on the primary element?
Shouldn't that element be isolated?
Please test the sunhans 4 and 10W amplifiers. The 4W seems to work. But the cheap Chinese amplifiers seem to have a bigger range. But lower WiFi speed
me wondering how the hell that antenna increases the directivity.
i have maded it but its not working tell me how can i make work
did you isolated just last copper circle?
Good video Andrew. Very interesting. Obviously the modified version is the go.
At a rough guess looking at the scan results, what dBi do you think the original and modified antennas are each achieving ?
Cheers Rob
How would using a non conducting boom such as a wooden dowel affect the antenna?
Can I scale this down to work at 9.5 GHz?