Hi
My first post and I am not experienced in RF at all - please be gentle!
Trying to understand how a Class C RF amplifier can produce an AM signal!
As I understand so far the Class C RF amplifier will only faithfully 'reproduce' the top 'bit' of the input waveform (always shown as a sine wave I notice). The next bit of the explanation then details how this 'top bit' causes a tuned load to 'resonate' thereby restoring the signal. Like striking a bell.
OK so you reconsitute a sine wave. Got that. Great if you just want a sine wave, say for morse code. BUT where does the modulation envelope of say my voice come into it?
If you modulate the amplitude of the 'top bit' with a voice signal you surely have simply reproduced a Class A Amplifier!
My question has resulted from a heated 'discussion' where I work as one party concludes that a Class C power amp cannot be used to boost a CB radio as it can't pass AM signals.
Can anyone shed any light?
James
My first post and I am not experienced in RF at all - please be gentle!
Trying to understand how a Class C RF amplifier can produce an AM signal!
As I understand so far the Class C RF amplifier will only faithfully 'reproduce' the top 'bit' of the input waveform (always shown as a sine wave I notice). The next bit of the explanation then details how this 'top bit' causes a tuned load to 'resonate' thereby restoring the signal. Like striking a bell.
OK so you reconsitute a sine wave. Got that. Great if you just want a sine wave, say for morse code. BUT where does the modulation envelope of say my voice come into it?
If you modulate the amplitude of the 'top bit' with a voice signal you surely have simply reproduced a Class A Amplifier!
My question has resulted from a heated 'discussion' where I work as one party concludes that a Class C power amp cannot be used to boost a CB radio as it can't pass AM signals.
Can anyone shed any light?
James