RF mixers

RF mixers; basic functions, active and passive mixers discussed. 1. Introduction of DIY homebrew HF transceiver, 2. Antenna amplifier, 3. Bandpass filters, 4. RF mixer, 5. Crystal filter, 6. Preamplifier, 7. Power-amplifier, 8. CPU, still open to do... Pls. find documentation, schematics and code on .