There is a discussion going on about what happens at the beginning of
the go loop on AMX systems.
As already pointed out by Bruno Guigas we did some changes to the
receiver handling in UXNMR. The purpose was to get a better baseline
behaviour in proton spectra. Therefore the receiver is opened as early
as possible to let the filters settle before the acquisition starts. We
tested this for a long period on a large number of spectrometers and had
always better results compared to the older timing. The new timing is
represented by the following pulse program:
;DE = 1.428 * DW for quad and 0.625 * DW for qf
define pulse rde=de-4u
1 ze
2 d1
p1 ph1
2.5u
1.5u ph30
rde:e
aq adc
rcyc=2 ph31
exit
ph1=0 2 2 0 1 3 3 1
ph30=0
ph31=0 2 2 0 1 3 3 1
Due to the pulse delay line the actual difference between the end of
the pulse and the opening of the receiver is only 2 usec.
In those cases were you get a ringdown of the RF pulse into the receiver
this timing may be changed by increasing those 4 usec.
With kind regards
RKe
--
=====================================================================
... ... Dr. Rainer Kerssebaum
. * . . Bruker Analytische Messtechnik GmbH
. . . . Application Lab
B R U K E R D-76287 Rheinstetten
. . . . Voice: +49-721-5161-139
. * . . Fax: +49-721-5161-297
... ... EMail: rke%bamdemo%bamsoft@Germany.EU.net
=====================================================================