Schematic diagrams. Electric Schema of FT-817
divided into the functionality blocks. All are in PNG format.
Here is the original
Block diagram from Yaesu. Detailed schematics follows
Main unit contain majority of circuitry. It consist of RX front
end filters, mixers and all IF circuits, IF filtering, demodulation,
NF amplification, modulation circuits, TX mixing and filtration up to all
band exciter, and others like charging and voltage regulations.
Final unit contain RF PA balanced pair of thransistors and
closest circiuts.
PA unit contain wide band RF driver stages, low pass filters and duplexers including
its switching, antenna selection switch.
Panel unit It is a CPU board and controlling elements from from panel.
PLL unit consist of local oscilator systesis for both 1st and 2nd LO.
