Quote:
Originally Posted by Skywave
As it's written, I understand it to mean that since the signal will be a variable quantity, infinity will be variable also as a consequence. Are we now into the mathematics of Georg Cantor?
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No.
An infinite impedance detector isn't really infinite of course, it's only that it can be considered infinite (can be neglected) from a practical point of view.
A diode detector may load a tuned circuit with 250kΩ, pretty constant whatever the signal, whereas the infinite impedance detector, with leakage through the glass etc may be equivalent to a load of 1000MΩ with strong signals and 500MΩ with weaker. That's a big change. But with the tuned circuit itself having a typical parallel loss resistance of 2MΩ, nobody is going to worry as the change will be swamped.