  Evolution of homonuclear J-coupling during t1 period creates Zero Quantum
artefacts which seriously degrade the performance of 2D NOESY. In our previous
work [28], it is demonstrated that creation of such artefacts can be prevented
by incorporation of a perfect echo based broadband homo-nuclear decoupling
technique during t1 period that also allows chemical shift encoding. However,
such experiments have limited F1 resolution as the perfect echo based
decoupling remains efficient for interpulse delay 2{\tau} (=t1) short compared
to 1/J. A solution to this problem is provided in the present work where we
show that even a partial decoupling effect of a perfect echo block for extended
t1 period close to 1/2J greatly suppress the build up of antiphase content and
thereby enhances the sensitivity of corresponding NOE cross peaks. The partial
decoupling do lead to generation of partial ZQ coherence which is further
eliminated by application of a ZQ filter.
