Switch626
| Joined: | Fri, Mar 18th 2016, 05:04 | Roles: | N/A | Moderates: | N/A |
Latest Topics
| Topic | Created | Posts | Views | Last Activity |
|---|---|---|---|---|
| Tube Ratio Detector Theory | Nov 21st 2020, 23:25 | 2 | 5,750 | on 22/11/20 |
| Setup to See S-Curve in FM Demodulator | Nov 7th 2020, 17:18 | 3 | 5,331 | on 7/11/20 |
Latest Posts
| Topic | Author | Posted On |
|---|---|---|
| Tube Ratio Detector Theory | Switch626 | on 21/11/20 |
| I found this schematic of a tube/valve ratio detector at http://www.r-type.org/addtext/add059.htm. Does this circuit work during only one-half of the IF cycle. What are the current paths above and below resonance? It's an intriguing circuit and I seem to be missing one thing to make it click. Thanks all for any help. |
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| Setup to See S-Curve in FM Demodulator | Switch626 | on 7/11/20 |
| Hi Bill, Yes, I am using a sweep gen, | ||
| Setup to See S-Curve in FM Demodulator | Switch626 | on 7/11/20 |
| Hello all, I was doing an alignment in a FM radio, your standard 88MHz-108MHz receiver. I completed the alignment but then thought I would see what a S-Curve looked like. I am injecting the FM signal into the base of a transistor (have a capacitor in series) that feeds a ratio detector tuned to the 10.7MHZ IF. I know I need two frequencies to view the curve in XY mode. Anyone know what the signals are: Do I modulate the 10.7MHz IF or sweep it? Where does the second signal go for XY? Any reference or help would be appreciated. 73's AG5EV |
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