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Calibration of the sweep linearity HP 8568B

In my HP 8568B Adjustments ( calibr. ) Manual are myriads of adjustments. But, surprisingly, no sweep linearity adjustment.

I have the complete schematics ( RF and IF ) and I have localized the sweep oscillator(s). Where and how should I start to linearize the horizontal sweep ?

I want some ( minor ) correction of the the last 25% of the sweep(s). I found how to lengthen and shorten the sweep(s) but obviously this does not help improve the linearity.

Thanks for any help. Peter, PE1E.

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PE1E
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