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==Testing== | ==Testing== |
Αναθεώρηση της 10:50, 6 Δεκεμβρίου 2008
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Testing
I will assume you are connecting the antenna to a wireless card in a laptop, and connecting to an accesspoint somewhere. You will need to a signal to noise meter to examine the signal strength. Most wifi cards come with software that does this. Now its time to test that the antenna actually works. This can be harder than it sounds, as unless you can remove the existing aerial from the card or ap, you can't tell it is using your new homebrew antenna. Well wrapping the existing antenna completely in 6-8 layers of tinfoil, has a dramatic reduction on signal strength, now connect the antenna, and the signal should go back up. Remember that omni antenna send out the signal horizontally, so don't test it from the room below your access point. Hopefully you should see that your new antenna actually works. There are three ways to test the gain of the new antenna
Use spectrum analyser in a professional radio lab compare the gain of your new antenna, to the gain of a known antenna (Not the pcmcia card) Carry out an empirical range test with your new antenna If you have access to a spectrum analyser I'd love to know your findings. If you have an existing omni or yagi antenna, then you can compare the snr readings between the two antenna. Remember to do the test outside, as bouncing the signal off walls can really give odd results. Try to stand as far away from the antenna as possible when doing the test, as even moving near it can change the results a lot. Position the two antenna in the same place for the test. Don't try and compare the snr of your new antenna to that of the wireless card in your laptop, as just by turning the laptop round, or lifting it up, or holding it, can dramatically change the snr. Try it and see what I mean. If you don't have another antenna, then wander down your street until you are out of range. Now wander back towards your AP, and wait for the laptop to chime that it has made a connection. Note how far from home you are. Try it again, with the laptop connected to the new antenna. Remember to keep the antenna vertical. I found carrying them in a bag with the antenna poking out the top works well. Try not to hold the antenna, as this will change the snr. You should now be able to pick up your AP about twice as far away, assuming there are no new massive obstacles. If you have a go at making this antenna, and get it working, drop me an email (address at bottom of page) and let me know how you found building it, whether you've found a simpler way, and ... be honest ... how long it took.
Problems
If you find that the antenna is not working, then try tilting it towards the AP, as if the dimensions are wrong, it tends to send the signal angled in a cone above and below the horizontal instead of horizontally. If this is the case, check the dimensions. If it still doesn't work, double check that the sectors are connected ok, and there are no crossed connections. If all else fails make sure you are not connecting it to a 60ft fly-lead as this will reduce the gain a lot.
Disclaimer
I should point out now that I don't claim that the above design is fit for any purpose, and don't accept any liability for use of the design, or any antenna based on this design. If you want to build an antenna using this design, then you are responsible for ensuring that it doesn't breach any laws where you are, and is compatible with any hardware you connect it to. If in doubt, buy a commercial antenna.
Source: http://wireless.gumph.org/articles/homemadeomni.html