Transistor mixing frequency (10.7MHZ)

Four types of circuit configurations:

Transistors are nonlinear components, when two different frequencies are added to the non-linear element, will produce a large number of new frequency signal, including two signal frequency difference, and, as well as its harmonic difference, and.

For example, I do the mixing need to get 10.7MHz, because the received RF signal frequency is 49.7MHz, so take the local oscillator frequency is 39MHz. can be obtained by 10.7MHZ ceramic filter.

L1 and C7 by the resonance point of 10.7MHz take.

Ad simple schematic diagram:

Transistor mixing frequency (10.7MHZ)