Hello Peter,
You can use an audio recording software like audacity
Record two channels with a frequency selected that gives you a
single dominating station - or use a signal generator.
Then expand the time scale so you can see the sinewaves and
their amplitude and phase relation.
73
Leif
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question : Are there any components that can be burned out or degraded by RFI that would affect the quadrature output?
background--
I built this ensemble II years ago and it's has worked perfectly in the radio shack.
A year or two ago it seems to have developed a mirror image problem including on a not so new Win10 I3 machine that used to work fine with it that I still use.
It shows mirror images on my macbook, a win10 laptop, another Win10 workstation, or a new Win11 desktop.
Realizing that some new computers and my own in particular, do not support a stereo mic input and/or are extremely vague in their techinical spec for the internal sound cards, I tried several USB cards, the latest, a Behringer UCA202 USB unit that definitely supports stereo inputs. No joy on any computer.
All that circumstantially isolates the problem to the Ensemble II itself.
The ensemble II still receives and tunes fine but I cannot eliminate the mirror image on the display. Both left and right outputs work. (one alone would produce a mirror image).
But combined, the quad phase difference should remove the mirror image.
Finally - before giving up, I consulted (I probably used that doc to assemble it - the websites have changed in that time ... ) ... checked voltages, etc.
I inspected the traces with magnification for shorts, found nothing, but reflowed anything suspicious.
I don't have a scope which would probably nail the problem down.
Q: what next?
Q: which components can malfunction (.e.g. burned out or degraded by RFI ) and affect the quadrature output?
thanks all, Peter KH6DK
