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Bi-Directional 2.4 GHz One Watt Amplifier With Receive Pre-Amp Bi-Directional 2. Gericom P4 2400 Drivers. 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.