Sunday, July 9, 2017

Using DBM as a frontend converter for a radio. Where to begin?

This is going to be a short excursion into converters. The basic plan is one unit fits all needs. I want a fixed LO and use the receiver to tune the signal. Simple enough? I'll try not to complicate it.
Now let's consider the basic circuit diagram and some more conversion signals.

The red vertical line is zero hertz and the lower image is below zero?

The block I called antenna circuit and filter image rejection could be broad band amplifiers to boost the RF and first IF signals. The DBMs will produce signal loss and the amps would compensate. I have built a single DBM converter and it works without the RF amp but I am using a receiver with a 3uv sensitivity.

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