Quote:
Originally Posted by Chris K
Not to keep pounding this but I figure the more I know the better I'll be able to do this properly. This is from an article by Stuart Seeley and Jack Avins in a 1947 RCA review publication titled "The Ratio Detector" This snip from the paper shows the 350kc sweep around the CW frequency. This is exactly the trace I have on the scope at 100mV.
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FYI: This is a discussion of the Ratio Detector. That is not what is used in the RCA receiver. The TV uses the Foster-Seeley Discriminator. It lacks the AM limiting function of the Ratio Detector.
You can tell the difference at a glance by looking at the diode polarities in the schematic. The Foster Seely are in the same direction and the Ratio Detector have the pair opposite facing.