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How to find the sensitivity of an AM Modulator circuit.

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achillez16

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Hi , i have this AM Modulator .. its a low level modulator ..with a bc548a transistor .. and i hav to find the sensitivity of this circuit .. how do i find it. ? .. I hav this due today . .. can nyone please help me out with this ? \

Thanks in advance...

AM Modulator.JPG
 

From your request it is not clear what you mean by "sensitivity".
AM modulators have a response expressed as the proportion of carrier amplitude to the control voltage. Some modulators allow to control carrier level by a DC input voltage, others have only AC-coupled input (via a capacitor.)
If your AM modulator is an audio to RF device, you can use an audio generator with a variable output, and use an oscilloscope to observe the RF AM output.
If your device is a video to RF, you can use the same setup but instead of a typical audio input of 1 kHz, you can inject e.g. 1 MHz input signal.
 

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