WiFi amplifiers. Good or bad.

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AZgl1500
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Re: WiFi amplifiers. Good or bad.

Post by AZgl1500 » Tue Oct 23, 2018 3:48 pm

Charlie wrote:
Tue Oct 23, 2018 3:13 pm
I would have thought that if my router were sending out a signal at 30dBn then what would happen is that I would likely see two AP's with the same name. One genuine the other the imposter. I understand how the receiving radio can be swamped but I am still transmitting a powerful signal of my own, how is that swamped.
your adapter's receiver will lock onto the strongest of the two signals, and that would be from the very local War Driver's position. this is a very common thing to happen.

I am quite sure, you have driven down a highway with your FM music radio listening to your favorite FM radio station, and suddenly the music disappears and your hear people talking. On the same channel you are tuned to. this can happen quite rapidly as the car moves along the road. It is related to the Wavelength of the signal and the placement of the barriers along the road.

the 1st signal temporarily is overcome by the 2nd signal which is stronger for a brief instant.

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Re: WiFi amplifiers. Good or bad.

Post by Charlie » Tue Oct 23, 2018 3:51 pm

AZgl1500 wrote:
Tue Oct 23, 2018 3:48 pm
Charlie wrote:
Tue Oct 23, 2018 3:13 pm
I would have thought that if my router were sending out a signal at 30dBn then what would happen is that I would likely see two AP's with the same name. One genuine the other the imposter. I understand how the receiving radio can be swamped but I am still transmitting a powerful signal of my own, how is that swamped.
your adapter's receiver will lock onto the strongest of the two signals, and that would be from the very local War Driver's position. this is a very common thing to happen.

I am quite sure, you have driven down a highway with your FM music radio listening to your favorite FM radio station, and suddenly the music disappears and your hear people talking. On the same channel you are tuned to. this can happen quite rapidly as the car moves along the road. It is related to the Wavelength of the signal and the placement of the barriers along the road.

the 1st signal temporarily is overcome by the 2nd signal which is stronger for a brief instant.
The fog is clearing.

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Re: WiFi amplifiers. Good or bad.

Post by BG405 » Wed Oct 24, 2018 9:04 am

How about directional WiFi antennae? These can give a decent range - several miles according to some accounts - without exceeding legal ERP levels (and/or using something which bypasses regulations & therefore may not provide a clean, properly filtered signal according to those regulations).

Just my 2p worth. :)
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Re: WiFi amplifiers. Good or bad.

Post by AZgl1500 » Thu Oct 25, 2018 3:48 am

BG405 wrote:
Wed Oct 24, 2018 9:04 am
How about directional WiFi antennae? These can give a decent range - several miles according to some accounts - without exceeding legal ERP levels (and/or using something which bypasses regulations & therefore may not provide a clean, properly filtered signal according to those regulations).

Just my 2p worth. :)
Ummmm,

unless my brain is really fogged up, I do believe that is what a Yagi Antenna is.

Forward gain of up to 26 dBi and backside, or off the Reflectors can be as low as 3-5 dBi
depends on the builder's design and method of construction.


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Re: WiFi amplifiers. Good or bad.

Post by BG405 » Thu Oct 25, 2018 12:48 pm

@AZgl1500 - yes, indeed. I've seen little dish antennae as well which, if I recall correctly, could be used with a laptop & were slightly less .. ahem .. obvious! :mrgreen:

I'm wondering whether to buy (or make) a Yagi & adding an antenna connection port to the netbook, or a dish. The latter would be easier as it could use an existing dongle & plug in to USB, but I can't find mine .. typical! :roll:
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Re: WiFi amplifiers. Good or bad.

Post by jimallyn » Thu Oct 25, 2018 2:07 pm

People have run wifi connections over 300 kilometers. Not sure about ERP limits here in the US, but there are ham frequencies in that range, so if you run it on one of the ham frequencies, the ERP limits wouldn't apply.
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Re: WiFi amplifiers. Good or bad.

Post by AZgl1500 » Thu Oct 25, 2018 2:55 pm

jimallyn wrote:
Thu Oct 25, 2018 2:07 pm
People have run wifi connections over 300 kilometers. Not sure about ERP limits here in the US, but there are ham frequencies in that range, so if you run it on one of the ham frequencies, the ERP limits wouldn't apply.
hmmmm,

that will get you a nice notice in the mail from the FCC :twisted:
no Commercial operations are allowed on Amateur Radio Frequencies.
and it would exceed the Bandwidth Limits allowed very fast.

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Re: WiFi amplifiers. Good or bad.

Post by BG405 » Thu Oct 25, 2018 3:33 pm

300Km? That's impressive (about 186 miles) but how many packets made it through? :mrgreen:

Great idea, BTW. Latency might be an issue with some stuff though.
AZgl1500 wrote:
Thu Oct 25, 2018 2:55 pm
mmmm,

that will get you a nice notice in the mail from the FCC :twisted:
no Commercial operations are allowed on Amateur Radio Frequencies.
I assumed Jimallyn was referring to amateur operations. Or, at least I hope so. :wink:
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Re: WiFi amplifiers. Good or bad.

Post by jimallyn » Thu Oct 25, 2018 4:31 pm

Which bandwidth limits are you talking about? For 70 cm and above there is no bandwidth limit other than stay within the ham band, and follow good amateur practices. Some of the HamWAN links in the Puget Sound area reach 300 Mbps. I wouldn't be surprised if there some with higher data rates.
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Re: WiFi amplifiers. Good or bad.

Post by GS3 » Sat Nov 03, 2018 1:24 pm

Charlie wrote:
Sat Oct 20, 2018 9:59 am
Recently ordered a cheap WiFi amplifier from Aliexpress and was wondering if they are any good?
Depends what you want to use it for but many or most people I know are disappointed by them and that is because they do not understand exactly how they work or what they can do and what they cannot do.
Charlie wrote:
Sat Oct 20, 2018 9:59 am
I've been told that the one I have coming is illegal to use in the UK but...
And the reason they are illegal is usually because they can interfere with other people's WiFi's. Unless you are way out in the country and have no nearby neighbors I would say it is quite inconsiderate to use it.

There are many factors to consider as they make a big difference. One is WiFi density around you. If you are alone in the middle of the country you can connect to your access point from quite far away but if there are other WiFi signals present they will interfere.

It is different if you are trying to cover a wide area than if you are trying to get coverage in a small area located at some distance, like, say, a barn.

I have some years of experience tinkering with this and every case is different and you need to understand and take into account all the variables.

People who buy a "WiFi range extender" are very often disappointed by their performance. Often simpler solutions can give better results.
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Re: WiFi amplifiers. Good or bad.

Post by Charlie » Sat Nov 03, 2018 3:52 pm

The WiFi amplifier in question is being held by customs, there has been some delay. My cooling fan arrived and it was ordered on a later date. I will have to wait and see if it clears customs. I don't believe they are illegal to buy or import, just to use in certain situations.

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Re: WiFi amplifiers. Good or bad.

Post by BG405 » Sun Nov 04, 2018 11:13 am

Charlie wrote:
Sat Nov 03, 2018 3:52 pm
The WiFi amplifier in question is being held by customs
Could be a cause for concern, especially if it doesn't exceed the duty threshold.
Charlie wrote:
Sat Nov 03, 2018 3:52 pm
I don't believe they are illegal to buy or import
Probably not; like those video senders you used to be able to buy.
Charlie wrote:
Sat Nov 03, 2018 3:52 pm
just to use in certain situations.
Certain situations include use within the UK. :(
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Re: WiFi amplifiers. Good or bad.

Post by Charlie » Wed Nov 07, 2018 7:53 am

Received the amplifier this morning and after a quick test I would say that signal strength is boosted by around 20%. There is a down side, when using my connection it seems slightly less responsive. Perhaps that is a trade off. I am going to try the dipole antenna as have been testing it with a small yagi.

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Re: WiFi amplifiers. Good or bad.

Post by AZgl1500 » Wed Nov 07, 2018 8:08 am

Charlie wrote:
Wed Nov 07, 2018 7:53 am
Received the amplifier this morning and after a quick test I would say that signal strength is boosted by around 20%. There is a down side, when using my connection it seems slightly less responsive. Perhaps that is a trade off. I am going to try the dipole antenna as have been testing it with a small yagi.
That less responsive is because you have inserted a repeater in the middle of the transmission path.

probably a small cost to you , for the added signal strength, the dipole will be weaker than the yagi by about 9 dBi ( assuming a typical hand held yagi, not a super long boom type )

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Re: WiFi amplifiers. Good or bad.

Post by Charlie » Wed Nov 07, 2018 10:01 am

I read somewhere that these amplifiers run hot so ordered a cooling fan. That is not correct, they run cool. I can use the fan on something else. I am putting too much into it at 30dBm as it states the max is 20dBm input. I haven't noticed any negative effects from overpowering it, I thought heat would be a definite issue.

I don't own a router capable of accepting an extremal antenna so cannot test the transmission boost of my own signal. My next router will have removable antennae for sure.

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Re: WiFi amplifiers. Good or bad.

Post by AZgl1500 » Wed Nov 07, 2018 10:13 am

yeah,

I won't buy anything w/o removable antennas.

I can't predict my future needs all that well :roll:

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