Posts Tagged ‘cheap’

Curtain Quad Panel Wifi Antenna 18dbi

Thursday, September 27th, 2007

Are You remember this one : http://www.digdice.com/?p=138

panel.jpg

This looks very crazy, oddly promising 18 dbi gain.

BUT now there are more info about this, as promised by admin of the GUW forum.

Here is all info in spanish :

http://www.guw.cl/sitio/index.php?option=com_content&task=view&id=110&Itemid=36

The author of this one is Ross Anderson and the original idea for this antenna is from 1984 year 🙂 the good thing is that all the information about this one is here.

image001.jpg

There is interesting version of this antenna build by the author. On his site he describes the how to build this panel antenna from zing fence. The original 2400mhz version is here : http://home.comcast.net/~ross_anderson/2400MHzAntenna.htm

The idea and the info : http://home.comcast.net/~ross_anderson/CurtainQuad.htm

Here some pictures from the em simulation from GUW site :

18dbi wifi panel antenna

So as I see this, I can accept that this antenna works. On the site is said that this antenna outperform many commercial ones.

The diagram of this antenna and look from in front :

18dbi wifi panel antenna cheap homemade diy diapositiva5.jpg

More pictures of this antenna build and tested for 1296Mhz and 2400mhz :

image005.jpgimage004.jpg

Interesting about this is the using of speaker wire for matching transformer :

“… Solder a 1+ inch piece of speaker wire to the N connector. One wire goes to the center pin; the other wire to the outside part of the connector. I drilled a small hole in the connector flange for the wire to be inserted into and soldered in place. Leave about 3/4 inch of insulation on the speaker wire (as measured where the two wires are together). This is the transformer, transforming the antenna impedance to about 50 ohms.”

image002.jpg
There is also PDF tutorial on the GUW site : guw panel 18dbi.pdf

So this is promising design which I should test soon too. Will be interesting to find out will this design works if it is printed on PCB?

Dual Radio Router Interfacing Project

Monday, September 10th, 2007

 

I missed this, but looks like there is a way to interface second usb wlan dongle whit a cheap wifi router.

Recently searching for one open wifi book I found this : http://wiki.wndw.net/moin/DualRadioConstruction

On router running “Kamikaze” version of OpenWRT these gays are able to interface and compile drivers for ZyDas usb radio.

Here is a link to pdf file whit some pictures inside dual-radio-and-USB-ant.pdf

It will be interesting if there are possibility to use any of modern thing on the market to build something similar. The Netgear router used in this project is no longer available. As I know one of the little things whit a usb port are some of Asus routers, but there is broadcom not atheros radios inside.

 

 

DIY Hi-Gain Antenna on Cheap ;)

Friday, August 31st, 2007


Very Cheap Dipole feeders – they are easy to be build and you do not need a lot or expensive materials. Everything here can be made from wire or scrap /I watch too much scarpwars on Discovery channel 🙂 /

I found some very interesting looking feeders for dishes – VERY cheap to make, first is made only from feeder line 🙂 or simple coax.

http://patraswireless.net/antennas.html

dipoledipole

A simple dipole feed. Good solution to illuminate parabolic constructions (solid, grid etc.) Heliax holds the dipole, as well as feeds the N-type female connector to the back. Tests shown 4 dBi (against Lucent 24 dBi parabolic grid). “

Second is Russian of course http://www.hub.ru/forum/index.php?showtopic=16285

Name of the file is interesting too D_Linc3_008.jpg

d_linc3_008.jpg

Interesting materials – onli several pieces of pcb board are used – very good.

From the same forum are these too –

d1.jpg d2.jpgdipole_construction.gif

Last pic is from http://martybugs.net/wireless/conifermods2.cgi

And for the end howto make wire reflector or DIY Parabolic Grid Reflector

diy reflector

Info is from this : http://www.zero13wireless.net/foro/showthread.php?t=248

19dbi gird blueprint :

19dbi gird blueprint

For me is easy to buy small offset dish – 80cm is around 10 to 15 Euros here.