Question

I've been trying to find a way to acquire NMR data on a UnityPlus system with 20, 30 40 degrees and no the standard ones. Can I choose the receiver phase to other values different than 90 degree increments?

Answer 1

Hi Frederico,

You can easily introduce any phase shift on the pulse phases using the "obsstepsize" and "xmtrphase" command (see below). So in principle you can shift all phases on the obs channel in the opposite direction to get the desired effect. I don't know if the command also works on the receiver only if you set the phaseshift right before the acquisition and reset it at the beginning of your sequence - just give it a try (can't try it myself since I don't work with Varian machines any more).

   obsstepsize(1.0);
   xmtrphase(v10);
   rgpulse(pw,v1,rof1,0.0);
   xmtrphase(zero);

just set v10 to the desired phase, v1 can be a 90deg incremented phase cycle on top of your small phase shift) - alternatively you can use obsstepsize(10.0); and v10=2,3,4 for 20,30,40 degr.

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