Regarding Rp of an LC

From what I read, I guess:

1. He works out the optimum match between antenna and LC tank.
2. She investigates the optimum match between LC tank and load completely unrelated to 1.

OTOH, I would be glad to find a reference on how to accurately derive the proposed equivalent circuit of the diode detector at low signal levels.

Pere

Ya, that's what it looks like to me, I sent him an email, but it looks like he is not responding to any, his store is closed also, at least for now.

Here's a bunch of information about diode detectors in crystal radios. I think the first one will answer your question, but Ben Tongue has great info too.

Ben's index page;

Thanks, MikeK

I received a reply to my question from the webpage author.

"In the formule Rp=2.pi.f.L.Q , I use the Q of the coil in the right-side part of circuit diagram 2. This Q is halve the value of the coil Q in the left-side part of circuit diagram 2.

I consider the right side part of diagram 2 to be a new unloaded circuit, with it own unloaded Q. With unloaded I mean here "not loaded with diode or loudspeaker".

Maybe one might say; it's not unloaded because the antenne is connected" But as you see in circuit diagram 2, in the right side part, there is no antenne anymore. It's just a new LC circuit with it's own Q value, wich we are gonna load with diode and speaker.

The calculated value of Rp is the value which the diode sees, in the situation with the antenna connected"

Thanks! I have also found that the Agilent datasheets provide a lot of info, with some equivalent models in close agreement with your links'.

Pere

Hi Pere, Found this page, has a lot of info, some is a rehash of Ben's info but there is a lot here.