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#1
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Thanks Franco! It remains to find out to what frequency to tune the input circuit L1 and C1, if I understood you correctly, then it should be approximately in the region of 80-100 MHz
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#2
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In the L1 / C10 resonant circuit, by varying the capacitance of the capacitor, we see the amplitude of the signal, at the output of the sensor stage, increase when a harmonic of 20Mhz is reached, and then decrease moving away from it.
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#3
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You say c10 is the one on the TP3 collector
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#4
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As I understand it ..... you talked about a circuit with a quartz at 8 MHz, there in the circuit yes L1-C10. I asked you about the 20 MHz quartz circuit and there in the L1-C1 circuit. Thank you Franco, now I understand your explanation about harmonics.
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#5
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The 20 Mhz lrl is a improvement of 8 Mhz lrl, C10 in the 8 Mhz sensor stage has been replaced with a variable capacitor.
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#6
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Thank you dear friend
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#7
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https://ibb.co/p0XJ5pP
hello i designed franco 80mhz i will try . |
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