I have a weird problem with our AV-II 200 and HPPR preamplifiers.
For fluorine we can use X-BB19F-2HS preamplifier or selective 19F
preamplifier.
If to use the first one, with QNP probe and TFT testsample S/N around 85
is very easy to achieve. If to recable HPPR for 19F module then at the
same conditions the S/N is only around 5 !!
90 deg pulses are nearly the same for both setups.
Has someone seen a similar problem or has idea what is wrong?
Many thanks
Vahur
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Vahur Mäemets
University of Tartu
Jakobi 2, 51014,
Tartu, Estonia
Received on Wed Dec 03 2008 - 07:33:33 MST