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marsbar

My wifi antennas

Posted (edited)

I have made 2 antennas. 

They seem to perform ezactly the same, I got same signal strength on both.

I thought the patch,antenba would perform better but no luck.

On the patch antenna, should the plates be grounded via the 6mm center bolt?

I also made a parabolic dish, but I am not sure if the feeder horn is optimal. I started with 31mm lengt for antenna inside can, but signal got better cutting it 1mm and inserting two washers at bottom.

The USB adapter is  Deal Extreme ALFA adapter, 3070 chip but probably fake. 

I have used a 6m cat. 5 cable for USB.

Any thoughts on improvement? Dish is oval, not sure if I,got the focus point correctly.

But I get 100% 500m away signal...

 

 

 

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IMG_20200507_111822.jpg

Edited by marsbar
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,,,hi bro..!!!

,,, how did you connect the antenna to the usb adapter (what type it is ... ???))...!!!!

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Here is my parabolic antenna. The focus was calculated using the with of the antenna. Length of coax center was 31mm, but cutting it to 30mm gave better signal. Then I added two washers.

Inside the water proof box there is a fake ALFA USB WiFi adapter from DealExtreme.com.

I get 100% signal from an AP 500m away. From 2km I get 75%. Unfortunately there are 40 APs and some are very strong sending out noise on the same channels... 

Any tips to improve the system? Will original ALFA adapter help?

IMG_20200513_161041.jpg

IMG_20200513_160949.jpg

IMG_20200513_160827.jpg

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Posted (edited)

Unfortunately no open APs... but you know what I am thinking of. Reaver did not work... and I painted it military green for comuflage. But grey would have worked better I assume...

Edited by marsbar

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Some more info on my setup:

Cat. 5 cable length is 6m. + and - is transffered via 6 wires, USB communication on pair blue and white.

Two capacitors approx. 10uF is connected in both ends of + and - to avoid noise from power supply into communication pair.

A 1m coax is soldered directly to the tin can, center of wire is 30mm. It's 0,5mm thick.

Question: What is the best length of antenna element? I see some places Ø should be 3mm and length 31mm.

I am considering using the patch antenna instead of the cantenna for feeder. Would this improve signal?

The coax from the USB adapter to cantenna is 1m long. I need this cable because of water tight box. Antenna is placed outdoor...

Cables enters the box in the bottom to aboid water ingress. Coax cable is professional type, double outer braid.

 

Spoiler

 

 

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.... this is how a USB connector of ALFA  modem is connected to a CAT5 cable...

436.jpg

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I simply used an usb cable I cut, I kept the lead as short as possible. At first I used 10m. Then I,sometimes got some trouble connecting. I then reduced it to 6m. I believe 5m is the maximum length of an usb cable. 

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,,, show me what your real installation looks like...!!!

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I will post some connection pictures when I get back next week!

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