Very often I'm being asked how can we aim such long distance WiFi links.
A relatively simple way of doing this would be to use a high-power analog signal transmitter fed into the antenna on one side, with a spectrum analyzer identifying that signal on the other side.
In our global village world - we can find the above for less then $300 (total for both sides), which conventionally would cost way over $10,000:
Buy a high-power 2.4Ghz video transmitter from:www.chinawholesaleonline.org
Here is the small transmitter being measured with a spectrum analyzer to establish the power. Look at the nice and stable analog signal which is so easy to spot on the far side.
|dispatched a replacement unit (on his expense - including the shipment) this time from another manufacturer. Days later - I was testing the new unit which works flawlessly and emits the expected 2 watts power.
The unit comes with a 4-way switch to select the frequency - all within the WiFi band.
For the other side - all we need is a low-cost spectrum analyzer - hemm, sound impossible - but there is a solution: buy an extremely overpriced $400 Wi-Spy USB gadget , to replace a full-blown spectrum analyzer. Or buy the half-price and still over-priced older-version WiSpy without the external antenna connector. I opted for the later and decided to modify the unit myself to include the RF connector. The RP-SMA connector cost about $2 and in 10-15 minutes of work I could save the extra $197 - seems like a good deal.
I the photos of the modification should be self explanatory - if anyone have any questions - feel free to use the "comments" below.
I remember someone else who had posted long ago about this modification, but I searched the net and could not find it anymore.
While a bit on the ugly side - it does work well and easy to do. Arguably my selection of PCB-mounted connector was not ideal, but that is what I have in hand at the time. It must also be a bit less lossy then any crimped connector with a coaxial cable - so maybe a bit of increased sensitivity.