[esa-t474] calibration tone harmonic

[Bino Maiheu]

Hi All,

After a suggestion from Alex and overcoming my own laziness, I've
studied a bit more in detail the residual from the calibration tone
fits. It reveals there is a clear harmonic around 33 MHz. Plots are in 

https://www.hep.ucl.ac.uk/elog//T-474/100

Since we have our IF mirrored from the 2nd nyquist band at 17 MHz ( from
83 ) and 33 MHz is strangely equal to 50 MHz (fNy) - 17 MHz... Possibly
non-perfect image rejection filter ? Alex, Yury ?

Cheers,
     bino



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