In setting up my electronics bench I am having trouble finding a
reflectance bridge for tuning NMR probes. There was some good discussion
of this in the AMMRL archives some years ago. But I can't find the same
vendors and models, and there are sooo many different kinds of bridges out
there. I'd be grateful (and will post a summary) if those who have one
could tell me:
What make & model number reflectance bridge do you use? Do you recommend
it as good, economical, or both?
` -- Roger
This would be the "magic tee" that you put between your swept frequency
generator and oscilloscope (via an RF detector), with the probe on one side
and a 50 ohm load on the other side.
If folks can say what RF detector they use that would be a useful list, too.
And any good references (web pages) on tuning (or making) probes.
Some people in the earlier summary used a directional coupler from
Mini-Circuits.
When I tried this I found a large background signal, much larger than a
probe that tuned well on the spectrometer - I could see slight movement
only if I knew where to look. Is there a trick to this anyone knows?
Received on Tue Oct 02 2001 - 11:05:48 MST