Hi Zdenek,
I would bid on the aging of some of the plate capacitors embedded in RF coil
construction or chip capacitor in the RF circuit. The cleaning of RF coil
may help in the first case, but usually, it is good to take off the gradient
coil for that and it is not that straightforward (wiring can be broken and etc.)
Once, I observed the magic that the tuning range rolled back after a while,
so one more iteration in adjusting the frequency was needed.
Much less probable the tuning capacitor is getting stuck so the range is
restricted. In that case, the ATMA may complain with the error
"motor .. can not be set to the position .... or so."
--
Regards,
Dr. Pavel Yushmanov,
+46736220672
P&L Scientific Instrument Services
Applied Physical Chemistry, KTH
Teknikringen 36,
100 44 Stockholm
Sweden
pavel_at_plscientific.se
http://www.plscientific.se
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Received on Wed Aug 02 2023 - 07:22:59 MST