Ramsey FM-10 A Schematic


To enhance the function of the Ramsey FM10-A transmitter, we replaced the components in the curcled area with precision parts and enclosed the circuit board in a shielded box. We also keep it in a place that has a stable temperature and humidity since both seem to cause the frequency to drift. You can place the whole assembly in a styrofoam cooler to help keep the conditions stable. I also removed the crystal which fixed the problem with variations from car to car. This picture has been resized to fit on this page. Save it and open it with a picture viewer program like Paint Shop Pro and then you can see the detail.

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