The red swich selects the function of the rotary encoder. Up selects the center frequency, Down selects the span. Pressing white button icreases the tuning speed.
Software updates implemented today:
-make the encoder more responsive.
-invert the sweep signal.
-reverse the function of the white button.
-increase the sweep frequency.
I have connected the analog board to the digital board. This caused an interface problem. The output of the PWM output is filtered. This filter needs to see a high impedance. The input impedance of the analog boar was too low. I added an emitter follower to take care of that problem. It works but it clips the output signal as the signal out of the PWM can be lower than 0.6 Volt. I think I can fix it by conneting the emitter resistor to -12 V instead of 0V.
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