I recently bought an IC-7000.? During my very first QSO (on QRP 70cm CW) my QSO partner (Chris GU3TUX) noticed frequency jumps at the start of each of my transmissions.? He kindly informed me, and I found the article by Daniel SM6VFZ via a Google search.
I also heard the frequency jumps when listening to GU3TUX after a TX-to-RX transition (when I went from TX to RX).
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I inserted a small piece of 10 mm thick medium density foam to fill the gap between the TCXO and the rear heat sink, and which filled the small gap between the side of the fan and the edge of the PCB.? ? No adhesive was needed: only the gentle pressure as the PCB was screwed back into position.? Initial tests in the shack indicate a complete resolution of the drifting/jumping issue.? I am very pleased? :-)
Thank you, Daniel SM6VFZ!
Steve G4ALG