Bob
This confuses me.
The calibration of the system changes ( or can change ) each and every time you
swap
out signal sources. The levels are not going to be consistent setup to setup.
Thus you
calibrate each and every time you change out either device.
Assuming each source is saturating the mixer sufficiently (to be
confirmed by measuring the output level of the source into 50 ohm) I do
not understand how changing a source can change the calibration. Can you
explain what is happening?
Please keep in mind I'm not after 0.1dBc/Hz accuracy, +/- 5dBc/Hz would
already be great.
Erik.
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