Roofing Filter Indicator with AGC

Roofing filters are a type of bandpass filter conventionally used in HF radio receivers in the first IF stage to limit the frequency spectrum passed on to later stages in the receiver. Automatic Gain Control (AGC) is used to ensure consistent output over the life of the secutity.


This is a companion discussion topic for the original entry at https://www.optuma.com/kb/optuma/tools/ehlers/roofing-filter-indicator-with-agc