Would you want to add a bi-directional 2.4GHz amplifier to your proxim Symphony with less than $100? If you nodded your head, then pay attention to this project, as this will benefit you in the long run…

Ok, the meaning for bi-directional means you can simply mount the amplifier at the antenna, which this help to overcome any cable loss. In addition to it, the amplifier also can automatically switch between receive and transmit modes.

Some of the components you needed:

  • RF Micro Devices (RF2126 1 watt 8-pin PSOP 2.4 GHz amp IC)
  • HFA3424 2.4 GHz - 2.5 GHz low noise amp (also a 8=pin PSOP device)
  • RF1K49093 8-pin PSOP power MOFSET
  • Some 1/32 inch, double-sized one-ounce copper clad FR-4 circuit board

First thing first, you must make the circuit board for the amp. To help you here, use those rub on thingys from Radio Shack (#276-1490) to layout the pattern. The 1 mm wide traces are nearly perfect for 50 ohm striplines 4.34 er, 1/32 inch FR-4 board material. Also, remember to leave large areas for the components that require some grounding process, and remove all the copper around the paths for a smoother RF energy flowing.

After you’ve finished with the circuit board, try to drill and solder all the ground. Start the grounding with the small surface amount capacitors, resistors etc and then the larger components. You only solder the IC at the end, and this to protect the IC from any extended damage. [read]

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