koji, tara

 The mystery about the distortion FASTOUT is solved. It actually works propperly.

From previous entry, the distortion in the error signal from FAST OUT is due to the low pass filter at 10 Hz just before the output.

The signal from tnc FASTOUT disappears when we plug in the lemo FASTOUT because the lemo cable we used has its polarity switched.

So it grounds the signal from TNC output as well.

     For an easy reference, I draw a cartoon diagram for the TTFSS circuit.

The small circles are SMA inputs,

the large circles with shadow are manual knobs,

the middle size circles are bnc outputs,

the diamonds are TNC outputs, and the half circles are bnc outputs for monitor.