First, i want to say how much i admire your work. Ive watched(studied) almost all of your content on youtube, (most more than once) and i have to admit, you are quite the expert. Hands down the best, most knowledgeable, and most practical when it comes to antennas and actually building them. On the subject of this video, it was an excellent comparison and analysis. The side by side test was on point and near flawless. Exactly how i would have tested. It's the kind of test i like to see and not something I see much of on youtube... kudos
A parabolic will win the gain competition for directional types, for omnidirectional types I'm pretty sure a slotted waveguide will be the winner. An old primestar dish ( ~3' X2' single focus offset parabolic) fed with a good biquad will give 27-30 Dbi . At this gain the pattern is a very tight beam ( ~3 Deg,) and can be hard to aim. the slotted waveguide gives close to the theoretical max for an omni of ~15 Bdi. Don't be fooled by idiotic claims of some seller/manufacturers. These gains were verified by computer modeling and later field tests see martybugs or Trevor Marshall's site for details and plans.
@@ghz24 what are you saying, i'm not a pro in those antennas just trying to figure out which antenna will catch signal from far away hotspot. any recommendations?
@@noobblet1996 Parabolic wins the gain game. Decibels are logarithmic so every 3 dB doubles the signal strength. The primestar dish I refered to is rare now but it was oval and about two feet wide and three feet tall. It's gain at 2.4 GHz is 27- 30 dBi 27 would be 512 times the signal of a perfectly omnidirectional ( isotropic) antenna. 30 dBi would be 1024 times. If I were trying what you are and didn't already have a primestar dish I'd search for an abandoned hughesnet dish. Replace the feed with a cantenna or biquad. Even a center feed 3 foot diameter dish (k band satellite) would work. The new dish antennas with three feeds might work but I've never tested them to see if they have a focal point or a focal area. You want a feed with a beamwidth that iluminates the whole dish but to wide will miss the edge and be wasted. Shorter than optimum cantennas and biquads fit the bill. Cable losses are extreme at this frequency I used ethernet to transport distance and placed a router in client mode running DD-wrt within pigtail distance of the feed point. Don't believe the advertising claims of companies trying to out do the competition. One final piece of advise try diferent heights above ground because at certain heights the ground reflection is 180 degrees out of phase with the main signal and can cancel out the signal. A couple feet higher or lower could be all the difference. Good luck. If you need more elaboration ask away Ill try. Oh and tree leaves suck.
I think on the third test you did there, you picked up different WiFi SSIDs for each cantenna (and that was the worst showing for the eBay can). Nice to see that a simple tweak of the radiator had so much effect though.
Well, consider the "legitimate" uses that can be thought of be such an item. Cell signals can be blocked by interfering signals, and it is also why many places will not sell frequency jammers. So, think about having a mass produced, commercially available directional antenna like this, in a world full of cell signals.... you could block peoples calls, or cause other "problems" in a solely cell frequency cantenna. Especially when you have thousands of users out there, aiming for heavy traffic areas. You can see where the issues come to play. They are out there though. It is similar to the frequency jammers. You are better off getting your own hardware/radio for the cell frequency, then making the antenna. I personally hate that a lot of Chinese knock off Yagis are tuned more towards that 800-1500mhz range. You might be able to use one of those TBH.
Color MehJewish I'm confused. Why are you comparing a directional antenna to a frequency jammer? Why would connecting a yagi antenna or cantenna to my LTE modem and pointing it at a cell tower cause problems for other people?
Okay, lets say that those types of items were commercially sold to the market. In theory, youd have a lot of directional, acute angeled transmissions going towards a tower. Seems like it would clear up a lot of the background noise we get from conventional antennas. Well, in conventional transmissions, the signal is not concentrated in such a strong, but small area. If multiple devices were pointing at each other (tower in the middle) or if they were both on one side, sending from a close area in respect to each other... The strong signals can "block" or disrupt the data being sent or received. So, it can cause a similar effect to having a jammer, bc there are various types of jamming equipment. Consider Wi-Fi... You can overpower frequencies to block any signals. Works with cells too (in the lower freq range) when their signal is overpowered. Imagine a commercially available to the public, scattering these overpowered signals in different directions. It would be like a freq jammer in the sense that they would be overpowering other signals all differently spaced from the tower. Other types of jammers include the ghetto ones, like when you write a script and broadcast it to pickup MAC addresses and DoS them so they cannot gain a signal. Id imagine there's cell-protocol equivalents, but im not as familiar with that field. I just know that we have limits on broadcast power, but imagining that power being directed by everyone towards the same towers, could cause frequency blocking by radio waves hitting each other n interrupting, or thru packets being messed up in transmitting them from various a angles. Not to even mention the idea that the tower itself, and other obstructions would scatter the "beamed" signals and potentially cause extra noise and other site map issues. If you want to learn more about it, check out site mapping, with apps like inSSIDer or Acrylic, connect a radio+antenna, and you can see realtime updates of the signals around you, collisions, overlapping channels, and various other problems to hurt radio transmissions. They'll give you a visual idea and other important data about signals that you pickup w your radio. W a laptop you can move around and find all sorts of radio anomalies. That's why a majority of higher power signals are mounted above a certain height too. So they do not interfere and they need to be strategically placed. Sometimes even shielded from directional transmissions from other high power relays/broadcasts.
Np anytime. That's the beauty of technology. Most in the field(s) prefer to share the knowledge and help others. One person might have expertise in a certain area, but lack knowledge of another area, while the opposite is true for their peer. Helping each other educate and empower themselves only improves the world we live in, mutally. The more i know and share, the more i can help others contribute, and the cycle continues. I feel that all of us "tech-ies" are just awestruck by the material, so we enjoy talking to others about it - especially when its something new. Btw, im giving you some advice thru exp. We use the self-made signal jamners to test Denial of Service vectors in some pentesting projects. For instance, a local mini mall hired us, and we had shown them how a simple device and battery pack could take down all internal and external services without ever breaching the network. For clients like cell phone stores, or for those with wireless pay options, simple attacks like that can result in devastating loss of revenue. And the device is simply scanning for addresses or signal, and overloading their hosts, or overpowering their signals. Under 150$ of equipment. Def check those software site mappers oht tho. They'll give invaluable insight into learning/identifying the ways in which radio signals work. You can see what materials slow, absorb or reflect the signal. It gives a much better idea of how interactions occur and why.
Great videos, just wondering where you get the female sma bulkhead that you have fitted. I cant seem to find the ones that would attach to the alfa card. Do you have any useful ebay links to get the "hardware". Cheers
Clearly, 18dBi is another overinflated Chinese claim for a cantenna design! The N-connector is to facilitate the use of larger & lower loss cable you mentioned: for outdoor use, minimizing cable loss at 2.4 GHz is very important. For indoor use, where the receiver/transmitter is extremely close to the antenna, SMA is the way to go. Converting from N connector to an SMA is likely to result in 2dB loss if an adapter is used in addition to the SMA cable used in your antenna. With either antenna, weather will degrade the antenna. Rather than buy theirs, why shouldn't everyone make their own for much less than 30 pounds, since it is such a simple antenna? I like all your videos, but this one is closer to the dislike edge.
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First, i want to say how much i admire your work. Ive watched(studied) almost all of your content on youtube, (most more than once) and i have to admit, you are quite the expert. Hands down the best, most knowledgeable, and most practical when it comes to antennas and actually building them.
On the subject of this video, it was an excellent comparison and analysis. The side by side test was on point and near flawless. Exactly how i would have tested. It's the kind of test i like to see and not something I see much of on youtube... kudos
Andrew is forever making/testing antennas, from dishes to yagis. I wish he would say which is highest gain.
A parabolic will win the gain competition for directional types, for omnidirectional types I'm pretty sure a slotted waveguide will be the winner.
An old primestar dish ( ~3' X2' single focus offset parabolic) fed with a good biquad will give 27-30 Dbi . At this gain the pattern is a very tight beam ( ~3 Deg,) and can be hard to aim.
the slotted waveguide gives close to the theoretical max for an omni of ~15 Bdi.
Don't be fooled by idiotic claims of some seller/manufacturers.
These gains were verified by computer modeling and later field tests see martybugs or Trevor Marshall's site for details and plans.
@@ghz24 what are you saying, i'm not a pro in those antennas just trying to figure out which antenna will catch signal from far away hotspot. any recommendations?
@@noobblet1996 Parabolic wins the gain game.
Decibels are logarithmic so every 3 dB doubles the signal strength.
The primestar dish I refered to is rare now but it was oval and about two feet wide and three feet tall.
It's gain at 2.4 GHz is 27- 30 dBi
27 would be 512 times the signal of a perfectly omnidirectional ( isotropic) antenna.
30 dBi would be 1024 times.
If I were trying what you are and didn't already have a primestar dish I'd search for an abandoned hughesnet dish.
Replace the feed with a cantenna or biquad.
Even a center feed 3 foot diameter dish (k band satellite) would work.
The new dish antennas with three feeds might work but I've never tested them to see if they have a focal point or a focal area.
You want a feed with a beamwidth that iluminates the whole dish but to wide will miss the edge and be wasted. Shorter than optimum cantennas and biquads fit the bill.
Cable losses are extreme at this frequency I used ethernet to transport distance and placed a router in client mode running DD-wrt within pigtail distance of the feed point.
Don't believe the advertising claims of companies trying to out do the competition.
One final piece of advise try diferent heights above ground because at certain heights the ground reflection is 180 degrees out of phase with the main signal and can cancel out the signal.
A couple feet higher or lower could be all the difference. Good luck. If you need more elaboration ask away Ill try.
Oh and tree leaves suck.
I think on the third test you did there, you picked up different WiFi SSIDs for each cantenna (and that was the worst showing for the eBay can). Nice to see that a simple tweak of the radiator had so much effect though.
Dear Andrew, it is posible to transform this antena un mimo model?
Can it penetrate walls?
do you have any idea of the beam angle on your/a cantena?
11:18 It is way too long because it was made by a Celestial chap called WeeTo Long...
how far is the element on the turbotenna from the back of the can?
Grey-Hoverman H-POL OMNI-PLUS for hdtv . can you buld for 2.4g ?
When you purchase the cantenna of your eBay store do you get the lead with it ? Waiting for response on eBay. Cheers 😄
Interesting... could also use this in my microwave ham radio activities... 73 de KT1R
Hello,
What is the computer program you're using @ 05:48 ? Thanks ! 😊
Vistumbler
Do you have any idea why there's no commercially sold 3G/LTE cantennas?
Well, consider the "legitimate" uses that can be thought of be such an item. Cell signals can be blocked by interfering signals, and it is also why many places will not sell frequency jammers. So, think about having a mass produced, commercially available directional antenna like this, in a world full of cell signals.... you could block peoples calls, or cause other "problems" in a solely cell frequency cantenna. Especially when you have thousands of users out there, aiming for heavy traffic areas. You can see where the issues come to play.
They are out there though. It is similar to the frequency jammers. You are better off getting your own hardware/radio for the cell frequency, then making the antenna.
I personally hate that a lot of Chinese knock off Yagis are tuned more towards that 800-1500mhz range. You might be able to use one of those TBH.
Color MehJewish I'm confused. Why are you comparing a directional antenna to a frequency jammer? Why would connecting a yagi antenna or cantenna to my LTE modem and pointing it at a cell tower cause problems for other people?
Okay, lets say that those types of items were commercially sold to the market. In theory, youd have a lot of directional, acute angeled transmissions going towards a tower. Seems like it would clear up a lot of the background noise we get from conventional antennas. Well, in conventional transmissions, the signal is not concentrated in such a strong, but small area. If multiple devices were pointing at each other (tower in the middle) or if they were both on one side, sending from a close area in respect to each other... The strong signals can "block" or disrupt the data being sent or received. So, it can cause a similar effect to having a jammer, bc there are various types of jamming equipment. Consider Wi-Fi... You can overpower frequencies to block any signals. Works with cells too (in the lower freq range) when their signal is overpowered. Imagine a commercially available to the public, scattering these overpowered signals in different directions. It would be like a freq jammer in the sense that they would be overpowering other signals all differently spaced from the tower.
Other types of jammers include the ghetto ones, like when you write a script and broadcast it to pickup MAC addresses and DoS them so they cannot gain a signal. Id imagine there's cell-protocol equivalents, but im not as familiar with that field. I just know that we have limits on broadcast power, but imagining that power being directed by everyone towards the same towers, could cause frequency blocking by radio waves hitting each other n interrupting, or thru packets being messed up in transmitting them from various a angles. Not to even mention the idea that the tower itself, and other obstructions would scatter the "beamed" signals and potentially cause extra noise and other site map issues.
If you want to learn more about it, check out site mapping, with apps like inSSIDer or Acrylic, connect a radio+antenna, and you can see realtime updates of the signals around you, collisions, overlapping channels, and various other problems to hurt radio transmissions. They'll give you a visual idea and other important data about signals that you pickup w your radio. W a laptop you can move around and find all sorts of radio anomalies. That's why a majority of higher power signals are mounted above a certain height too. So they do not interfere and they need to be strategically placed. Sometimes even shielded from directional transmissions from other high power relays/broadcasts.
Color MehJewish Very very interesting. Thanks for the in-depth explanation.
Np anytime. That's the beauty of technology. Most in the field(s) prefer to share the knowledge and help others. One person might have expertise in a certain area, but lack knowledge of another area, while the opposite is true for their peer. Helping each other educate and empower themselves only improves the world we live in, mutally. The more i know and share, the more i can help others contribute, and the cycle continues.
I feel that all of us "tech-ies" are just awestruck by the material, so we enjoy talking to others about it - especially when its something new.
Btw, im giving you some advice thru exp. We use the self-made signal jamners to test Denial of Service vectors in some pentesting projects. For instance, a local mini mall hired us, and we had shown them how a simple device and battery pack could take down all internal and external services without ever breaching the network. For clients like cell phone stores, or for those with wireless pay options, simple attacks like that can result in devastating loss of revenue. And the device is simply scanning for addresses or signal, and overloading their hosts, or overpowering their signals. Under 150$ of equipment.
Def check those software site mappers oht tho. They'll give invaluable insight into learning/identifying the ways in which radio signals work. You can see what materials slow, absorb or reflect the signal. It gives a much better idea of how interactions occur and why.
Great videos, just wondering where you get the female sma bulkhead that you have fitted. I cant seem to find the ones that would attach to the alfa card. Do you have any useful ebay links to get the "hardware". Cheers
Here you go www.ebay.co.uk/itm/252297242833?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Thank you.. all ordered, now I can play making those great ideas that you post on here.
Definitely not aluminium
Clearly, 18dBi is another overinflated Chinese claim for a cantenna design! The N-connector is to facilitate the use of larger & lower loss cable you mentioned: for outdoor use, minimizing cable loss at 2.4 GHz is very important. For indoor use, where the receiver/transmitter is extremely close to the antenna, SMA is the way to go. Converting from N connector to an SMA is likely to result in 2dB loss if an adapter is used in addition to the SMA cable used in your antenna. With either antenna, weather will degrade the antenna. Rather than buy theirs, why shouldn't everyone make their own for much less than 30 pounds, since it is such a simple antenna? I like all your videos, but this one is closer to the dislike edge.