Well, the third channel has been installed on our AMX-500 and it's
working well. As is the computer upgrade. The three axis gradients
are going to be installed Real Soon Now. You'd think that the users
would be overjoyed.
Wrong.
Now they want a fourth channel to do better C13 decoupling.
Unfortunately, the bottom of the money barrel has been well scraped
to pay for the new toys and so I get to look for a cheap way to get
the new new toys.
Suggestions for adding a fourth channel to an AMX-500 would be
appreciated. Emphasis on saving money is appreciated.
The suggestion that I have gotten so far costs about $11K. Over half
of the cost is for a PTS synthesizer. A frequency synthesizer that
does 0-300 MHz with 1 Hz resolution seems like overkill when all we
want to do is waltz decouple either the carbonyl or C-alpha region.
If anyone has used another (cheaper) method for frequency synthesis
and gotten good results I'd love to hear about it.
Greg Young
Manager,
UNC Biomolecular NMR Lab
cheech@med.unc.edu