BFO Filter and Driver

Now the BFO frequency is generated via a VCO and PLL IC. and not via Xtal ocillator


Here is the pinout if the PLL IC FS6370, See the block diagram
The PLL IC gets it's input refference frequency from the 12.8 Mhz TCXO that also feeds the PIC with clock
Output B is programmed to generate 10.7015 Mhz (the BFO freq for USB) this is locked to the stable TCXO !
This signal is fed into a amplifier to filter it and drive the BFO mixer with +7dBm


This is the top side of the BFO Amp.


Bottom side og the BFO amp, for component values read about the NEW AMP

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