A Universal Threshold Extending Frequency-Modulated Feedback Demodulator

The results of a program to design, develop, and build a threshold extending frequency-modulated feedback (FMFB) demodulator which can be used as a universal demodulator is discussed. Its design details are described, as well as the method whereby its loop gain and frequency characteristics are changed. Both the methods by which it was tested and also the test results are described. Comparisons of test results and theoretical limits are described.