/diy/ - Do It Yourself

>>1348205
Its on the internet it must be true

>>1348205
that looks almost exactly like the Pringles cantenna I read about 15 years ago, minus the can
http://archive.oreilly.com/pub/post/antenna_on_the_cheap_er_chip.html

>>1348205
if you want to learn
https://www.youtube.com/watch?v=QTMi99HtW_k

>>1348205
It's just a Yagi of some sort. Though I'm not sure whether the copper discs are grounded or floating or whatever.

>>1348235
I saw this but it doesn't say it doesn't work.

>>1348205
clearly it works great for one-way communication.
The trick is the fact that WiFi is two-way communication
you need a high powered antennae on both ends.

He's not an Indian, they make fake tech videos.

>>1348444
He checked the speed which requires 2way communication.

Of course it's possible to recieve signals from far away, even extremely weak signals will still travel great distances. The difficulty starts when you try to USE those signals.

How the fuck do you think radio works?

The thing is the antennas "see" each other.
There's just a few trees or nothing between them.

>>1348448
That makes no fucking sense.
>How the fuck do you think radio works?
By receiving a very weak signal, duh.

>>1348447
because he built two of them.

>>1348453
Yes and?

>>1348205
"He" looks like an old mtf freak

>>1348205
>Russian
Cyka Blyat

>>1348205
I remember having this idea back when I needed more directional wifi, but ended up making usb wokfi instead since it was ultimately cheaper.

>>1348235
>says his channel is for jokes
>says his stuff doesn't work

Only his stuff does work since I've done most of it myself. It is just highly dangerous for most things and not recommended.

>>1348246
>grounded or floating or whatever.
doesn't matter for a Yagi aiui, the centers of all but the driven element are always at zero voltage anyway

>>1348455
you seem to have missed the point of the first post

>>1348460
The are a couple of things he has done that are clearly bs but a lot of it is legit. As far as a can tell he is Ukrainian near the Russian border.

>>1348205
>is it even possible
Yes. Just don't use threaded rod. It's a bad conductor and the uneven surface makes it even worse for 2.4Ghz.

Better get a copper plumbing pipe and solder discs to them. Polish joints to create smooth transitions.

Main issues with these antennas (type of yagi) is too high directionality and frequency selectivity.
If you build really good one, it might not even cover whole Wi-Fi channel. One degree off-target and the signal will be thousands times worse than with plain stick.

>>1348458
Actually Ukraine.

>>1348464
I was more concerned with the driven element being electrically connected to the reflector and directors, which is addressed in >>1348235.

>>1348444
It's not one way, any passive antenna will work for both transmitting and receiving, and with the right hardware both can be done at once. Just look at any handheld radio, only one antenna. But whether it does one better than the other has yet to be seen though.

Assuming the wifi card is akin to a voltage source, putting a better antenna on would be like plugging in a lower impedance, causing more current to flow and getting a stronger signal. In this way, a better receiving antenna will simply have a higher gain, one is not exclusive to work with the other. It's not like he has access to the nearby school to plug some sort of strange antenna into their wifi router.

http://www.instructables.com/id/Easy-to-Build-WIFI-24GHz-Yagi-Antenna/

>>1348522
>plugging in a lower impedance

50 ohms is the only impedance

>>1348706
>50 ohms is the only impedance
orly

>>1348522
>It's not one way, any passive antenna will work for both transmitting and receiving, and with the right hardware both can be done at once. Just look at any handheld radio, only one antenna.
You either have no idea how wifi works or you completely misunderstood him. You can have as high powered as an antenna as you want, but if the router doesn't have the same output power, it's pointless. Both devices need to be able to talk to each other for communication to occur, not just one souped-up device blasting signals at the other.

>>1348807
But by having a larger/more directional antenna that transmits a higher intensity of RF in the desired direction, your antenna will also have a higher gain for receiving signals from the same source. If I use a parabolic antenna instead of the default wifi antenna, it sends a stronger signal to the router and can detect a weaker one, thus its range in both directions is improved. That is, assuming that the maximum distance at which a wifi signal can be received in this instance is not determined by its signal-to-noise ratio.

>>1348824
Wifi protocol isn't the same as most other forms of RF communication though. Signal CLARITY is as important if not more important as signal STRENGTH. Yes you can detect a wifi access point 5km away. No you can not connect to the access point 5km away, UNLESS it is also using the same sort of signal boosting equipment. Detecting a weak signal is by no means the same as actual communication.

>>1348205
5km is possible with a high gain direction antenna on 2.4Ghz yes. This is basic RF shit nigga.

>>1348835
>UNLESS it is also using the same sort of signal boosting equipment
In which case my assumption about the signal:noise ratio will be wrong.

>>1348460
I can smell the carcinogens

>>1349742
>electricity maeks cansur

>>1349746
No, hexavalent chromium maeks cansur.

>>1349758
Cables are made of copper you faggot.

>>1348460

Kreosan is not for amateurs or pussies (aka diy)

>>1349897
But what is his silverware made of?

>inb4 hurr silver
no

>>1349947
I see, so he should just put in bare cables with no cutlery.

Why is home wifi so poor and low power? Clearly most people could benefit from better wifi.

>>1349983
to not pollute the are and fuck up other peoples wifi

>>1348460
>that sandwich.

Lost

>>1348205
>Million volt generator guy

>>1348205
I once put a cheap OEM antenna that came with the PCI card in a cast iron pot, and that alone got me unbelievably many wifi points. It's over 10 years ago, so facts are not remembered.

that microwave gun they made seems fake, anyone can confirm?

>>1349959
god dammit you fucking retard

>>1350303
Yes it's fake. Some guy on YT debunked it fairly well. You can get a tiny amount of interference from it but when powered by a taser it's pretty pathetic. The exploding speakers and such were all just fireworks and such.

I like their shitty angle-grinder-powered bicycle though, as with anything where they fuck with a bunch of Li-Ions and miraculously don't die.

>>1348205

> 5km
> "long distance"

www.ubnt.com

>>1350901
>~$150 for 25km
>vs
>maybe $5 for 5km

>>1351239
Just make a big dish antenna with a 40V+ RF amplifier and be better than both. Ham licence required, of course.

just buy super cheap Tplink stuff. It's good for 50+ km. I easily found several ten thousands of wifi networks in my town.

You have to watch out for black vans with antennas though!

>man makes pringles cantenna
>calls it a "gun"
>calls it a "rifle"
>makes sure his face is in EVERY FUCKING SHOT

WTF is this shit? Is this a joke? or a meme? I can't believe that this guy is serious.

>>1348556
I built that (actually a better version with a balun) and it sucked :( I get a better signal WITHOUT it....

>>1352803
As you can see females are Maya, the divine feminine, the Demiurge, the illusion of Materialistic Existence !

>>1353024
sure is blame in here

>>1348249
Right off the bat, he says its a wide range antenna, a Yagi antenna. Its not designed for range but rather for wide spectrum(. An actual narrowband(narrow but long) long range antenna is shown as a comparison and it thoroughly destroys it.

Its like Elon Musk selling you 200 Mile Tesla car but you only get 100 Mile. So you can say "thats not proof that it doesn't work" or whatever rational you wish to use. But it is what it is.

>>1353150
a yagi-uda is for distance. and usually narrow banded.
a log periodic is more wide banded
im not sure what this is that he built, but it looks like a yagi

I was thinking of fashioning something like this at work for an experiment, but encasing it into a pvc pipe. We have a 1200 meter vertical shaft for hoisting and the hoisting end effector requires monitoring for safety. Instead of running leaky feeder i thought of this along with some of these:

https://sensing.honeywell.com/switches/wireless-limit-switches

The area is quite rough, shit falls all the time and the enviroment is a bit corrosive. However the switches which work on wifi have a battery life of 1 year and are ip65.

What do you think /diy, worth the try? Am I crazy?

>>1355589
>having to go in there every year and maintain that shit in the best case
Is running cable really so bad or expensive?

>>1348444
No, since the directional antenna gives the recived signal a boost as well as the transmitted signal.
The technique of using a directional antenna at a reciver is verry popular in FPV flying, especialy in long range setups, where some guys fly out up to 100 km with 20+dB.

>>1348205
This guy made a video where he powers a microwave magnetron with a handheld tazer so it's operating at like 2% power but somehow it still makes his speakers literally explode. He's full of shit and any time he makes an extraordinary claim it's most likely not true.

>>1355609
It's a 1200 meter vertical shaft. Leaky feeder would be about 3 million installed last time I did it. I'd normally try to sell the application with composite cable if I did that, where I'd get 900mhz, 2.4 Ghz and 5ghz. I've done this before and it works well but this shaft won't have the life (<7 years) Here's the details.

>no stairs, or ladder only access is to get to it from the hoist
>concrete walls that are curved so we have have to make our own mounts to hang them. We've done this for 4/0 air guard with success but again very costly. In reality it's 4 different mounting situations.
>leaky feeder would only be good for those switches instead of general wifi allegedly due to the different vendors and their proprietary bullshit
>that distance in leaky feeder requires inline amplifiers/repeaters and introduces delays.

Currently the shaft enjoys a UHF/VHF leaky feeder and I cant touch it. The switches use 2.4ghz. I can't run a wire on the hoist ropes. The ropes are 2.75" metal ropes and are grounded. Im not allowed to add car batteries to the hoist end effector due to payload restrictions and the fact the batteries need changing every week. It's why these switches seemed ideal for the mechanical monitoring.

The switches come with yagis but they are not sleeved. Piece of ore falls on it and they are toast, and expensive. I can buy better ones but they are all huge. I need the distance and maybe 1kbps.

The end effector is maintained well but shit happens and if it does it can compromise steel in the shaft.

Kinda why I thought this might work.

>>1348444
>you need a high powered antennae on both ends.
your cellphone is pocket-sized proof that you don't

a high-gain antenna on one end means it can receive weak signals as well as blasting more of its power towards them (it's not more power, it's just focused to make better use of what's available)

>>1355908
Oh yeah, that.

>>1348448
https://www.wired.com/2007/06/w-wifi-record-2/

>>1348459
you could have made a planar wifi antenna with a PCB (etched using, say, this method: https://hackaday.com/2008/07/28/how-to-etch-a-single-sided-pcb/ ) and a pigtail cable...
OR (TIL) you could have bought some from ali: https://www.aliexpress.com/item/5PCS-LOT-2-4G-6dbi-PCB-planar-antenna-wifi-module-antenna-high-gain-built-in-antenna/32811859237.html

>>1348235
>The WiFi Gun Does it Really Work?
>no

>>1348447
>He's not an Indian, they make fake tech videos.
>>>/trump/