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Re: Digital Interface - transformer seems to drastically weaken signal

 

Rob,
As with Gordon, I cannot get to all of the links that you posted.? Regardless, my first thought is that you are possibly shorting out any DC bias with the transformer unless you have a capacitor on the input to your op-amp/Teensy.? There is a capacitor on the output of all of the uBITX versions, which may be why it works when directly connected.? I would try a 1 uF or higher cap for DC isolation.

73
Evan
AC9TU
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