Effectively this works with any diameter can in the range of 90mm to 110mm, check out this online calculator for your own specifics. If the antenna system's characteristic impedance doesn't match the transmitter, then you have an impedance mismatch which can, if the mismatch is too large, cause physical damage to the final transistors in the transmitter. Build the ultimate Wi-Fi boosting cantenna. A transmitter is designed to use an antenna system that has a specific impedance. I'm not going to go into a treatise on antenna theory. A transmitter is designed for a specific impedance, measured in ohms. Working with antennas isn't just a simple matter of hooking it up. However, you're just as likely to ruin your adapter. Assuming you were able to identify where to solder the coax, and are skilled enough at working with surface mount boards, it MIGHT work. Find where it connects to the board and solder the center conductor of the coax where the antenna connects and the coax shield would need to connect to ground. You'd still need coax and you'd need to crack open the WiFi adapter and locate the antenna. If you're adapter lacks an external antenna connector then I'm not certain how you'd be able to do this. I've never built one of these before, but as to your question about the coax connector, if your USB WiFi adapter has an external antenna connector, you'll need a coax jumper with the same kind of connector as is on your WiFi adapter.
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