not getting proper colpitts oscillator output

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mchak

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Those values and connection looks suspect. Try the circuit below.
 

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    mchak

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That effect is called "squegging" and is normally associated with oscillators that have too much feedback, which means the very powerful RF oscillations upset the DC bias. It could be interesting to alter the value of the .1MF cap to see if it changes the squegging time constant.
Frank
 

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