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From: AB9IL on 25 Feb 2010 01:30
Recently I had a need to get substantial improvement in my wireless
router's performance, and thought a yagi antenna would help. Whoa! It
did indeed help, so I have posted some pictures and a short how-to on
the web at:

http://www.ab9il.net/wlan-projects/wifi7.html

It is the same 15 element yagi used for extending the range of USB
wireless adapters, but connected via pigtail to a router. I can now
connect indoors through concrete and plaster walls or provide wi-fi
connectivity to laptop and Ipod touch users up to 300 meters away, in
the presence of interference.

Maybe it can help some of you trying to cover some large areas with
your routers.

Phil AB9IL
From: me here on 25 Feb 2010 04:22
AB9IL wrote:

> Recently I had a need to get substantial improvement in my wireless
> router's performance, and thought a yagi antenna would help. Whoa! It
> did indeed help, so I have posted some pictures and a short how-to on
> the web at:
>
> http://www.ab9il.net/wlan-projects/wifi7.html
>
> It is the same 15 element yagi used for extending the range of USB
> wireless adapters, but connected via pigtail to a router. I can now
> connect indoors through concrete and plaster walls or provide wi-fi
> connectivity to laptop and Ipod touch users up to 300 meters away, in
> the presence of interference.
>
> Maybe it can help some of you trying to cover some large areas with
> your routers.
>
> Phil AB9IL


The only downside is that the router yagi will concentrate the signal
path over about 30 degrees, which greatly restricts the coverage the
access point is able to provide.

I have also played about with this type of antenna and you might find
my write up of interest - refers to a $25 cheap Chinese yagi compared
to other antenna types.

http://users.picknowl.com.au/~gloaming_agnet/ant1.html

Hardly worth trying to make one at that price.

From: me here on 25 Feb 2010 19:08
u wrote:

> AB9IL <ab9il.worldwide(a)gmail.com> wrote in
> news:3a461770-4d5e-41cd-b243-
> b0dfa9a8331f(a)k18g2000prf.googlegroups.com:
>
> > http://www.ab9il.net/wlan-projects/wifi7.html
> >
>
> The record was set using 2 parabolic dish reflectors, as I recall
> over 100km at both ends. Dish reflectors by design I think provide
> the largest gain but are difficult to aim. I am using a homemade 1/2
> parabolic to focus the signal onto a 5 inch wubber duckey antenna
> that came with my USB radio. Works fine, no need to purchase
> manufactured antennas for the home user just wanting to connect to
> the net.

That's right.

There are certainly plenty of cheap and very effective options out
there.

I haven't tried the half parabola yet, but it should be pretty similar
to a corner reflector I expect.

The salad bowl/wire strainer also works better than it deserves to :-)

I often hear 3G net users whinging about their lousy reception, yet
when you try to explain how they could easily overcome it by putting
their adapter on an extension cable and using some sort of reflector,
they just look at you like you're mad.

I wouldn't mind trying out tis item on Ebay - cheap and interesting.

Item number: 280466040537

Anyone used one yet?


From: AnthonyL on 26 Feb 2010 07:17
On Wed, 24 Feb 2010 22:30:44 -0800 (PST), AB9IL
<ab9il.worldwide(a)gmail.com> wrote:

>Recently I had a need to get substantial improvement in my wireless
>router's performance, and thought a yagi antenna would help. Whoa! It
>did indeed help, so I have posted some pictures and a short how-to on
>the web at:
>
>http://www.ab9il.net/wlan-projects/wifi7.html
>
>It is the same 15 element yagi used for extending the range of USB
>wireless adapters, but connected via pigtail to a router. I can now
>connect indoors through concrete and plaster walls or provide wi-fi
>connectivity to laptop and Ipod touch users up to 300 meters away, in
>the presence of interference.
>
>Maybe it can help some of you trying to cover some large areas with
>your routers.
>


Isn't it necessary to boost the signal of the receiving equipment as
well, or is it sufficient that the sensitivity on the router antenna
has been improved enough to still receive the weaker connected device?

Thanks


--
AnthonyL
From: seaweedsl on 26 Feb 2010 08:46

>
> Isn't it necessary to boost the signal of the receiving equipment as
> well, or is it sufficient that the sensitivity on the router antenna
> has been improved enough to still receive the weaker connected device?
>


Antennas work for both transmit & receive, so higher gain is in both
directions for any radios+antennas within it's field of coverage.
Weaker or not.

It's when you up the transmit amp alone that you get lopsided
effects. Thus the general rule is to address weak connections with
antenna gain not radio amps.


Steve
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