Re: 8566B - notches in response
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Hi Vladan. Well, I built up 4 damping networks and performed an alignment on the 3MHz crystal IF in my 8566B, with the result that the notch can not be adjusted out? of the 1kHz response. The board is in beautiful condition, and none of the trimmers are damaged. ?If only one damping network is used to damp the crystal associated with C6 then the notches and a lot of the assymetry disappear, so I`m picking there`s a component failure in the area of C6, but where to go from there. I guess I could check the dc conditions around the active devices...Adjustment of C7 [centre, or null adjustment] works as it should, and adjustment of C6 moves the notch on the upper skirt of the 1kHz Res BW response up and down the skirt. Do you wish to suggest which component might be faulty? Cheers!......................Don C.
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