Homebrew Wifi Amplifiers

WiFi connections might not be quite as good as physical cable, but they do offer the ability to move your computer around without physically rewiring or reconnecting things. Unfortunately, these connections are usually limited to, at most, a couple hundred feet. On the other hand, if the signal is properly focused with an off-the-shelf or improvised directional antenna, this range can be improved immensely. Check out these six examples of how you can make this kind of signal-focusing antenna out of nearly anything! Proving this kind of antenna isn’t a new idea, this strainer-based antenna back in 2006.

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Feb 4, 2015 - WiFi connections might not be quite as good as physical cable, but they. Can make this kind of signal-focusing antenna out of nearly anything! See how to build a weatherproof compact high gain WiFi antenna for under fifteen dollars! This homemade WiFi antenna should be enough for most applications.

Simple, but effective! If that wasn’t simple enough for you, here’s an.

Just add aluminum foil to bounce the signal into your WiFi dongle. Watermarks aside, will show you how to make a reception booster using a soda can. Slightly more expensive than paper, but you get to enjoy a delicious drink in the process!

Reminiscent of the first booster featured here, adds a baby bottle to protect the dongle from rain. Although it appears to be much smaller than the other strainer assembly, the creator claims it is able to receive signals from 1 kilometer away.

Bi-Directional 2.4 GHz One Watt Amplifier With Receive Pre-Amp Bi-Directional 2.4 GHz One Watt Amplifier With Receive Pre-Amp Some designs are for research only. Advanced microwave and RF design skillz will be required to build these circuits. This will show you how to add a bi-directional, 2.4 GHz amplifier to your Proxim Symphony for under $100.

Bi-directional means you can mount the amplifier at the antenna to help overcome any cable loss, and the amplifier will automatically switch between receive and transmit modes. The cost is reduced by using readily available materials and components. Also, instead of a complicated RF sensing transmit/receive switch, a logic level indication of transmit is sent to the amplifier through a length of low cost coaxial cable. The final RF power output of this amplifier will be around +31 dBm (1.3 watts) and the receive gain is around 16 dB (with a 2 dB noise figure).

If adapting for use on direct sequence spread spectrum systems, you'll want to lower the overall P1dB (+28 dBm or so) to keep the RF power amplifier in its linear region. To do this, attenuate the RF input power slightly. Receive amplification is tricky subject. When done right, it works wonders. When done wrong, your stuck listening to shortwave broadcast stations in Yugoslavia. If you don't need to have the receiver amplifier (due to excess local noise/intermodulation or loss coax loss), just replace it with a stripline jumper. If you're too stupid to figure that out, then please don't build these.

Adaptation to wireless network cards other than the Proxim Symphony should be trivial. Schematics Most schematics are in their native PostScript format for ease of printing and modification.

To use PostScript under Window$, you'll need to install the. Set Media to A2 for ease of viewing. • Block diagram • First original design - reference only - don't build • Second original design - reference only - don't build • Includes an experimental idea for remote RF sense. Newest design - reference only - work in progress • Untested - reference only • Untested - reference only Commercial Amplifiers Here are some really nice commercial 2.4 GHz amplifiers. • Nice idea with amp built into the antenna.

• • Sells multi-band amplifiers & converters. FCC Records & Pictures of Commercial Amplifiers • • • (20k PDF) • (34k PDF) • Includes parts list! • • • • • • • • • • • • • • Construction Notes Start by reading the for the RF2126 1 watt 8-pin PSOP 2.4 GHz amplifier IC. If you are up to working with this device, call RFMD up at 336-664-1233 and order a few (around $7 each), or ask if they will send you some free engineering samples. Next, read the for the HFA3424 2.4 GHz - 2.5 GHz low noise amplifier. It's also a 8-pin PSOP device.