>05 December 1996, Thursday, 1525 EST
>
Dear Lawrence,
The Bruker's AC-console has two decoupler power outputs at the back
side: one for high power (0H-31H) and one for low power (0L-63L). So, for
broadband and selective decoupling you must disconnect cable from one
output and connect to other one. It is more convenient to place two cables
from two outputs (Low and High) and connect/disconnect appropriate cable at
the decoupler input of the preamplifier housing. Directional coupler for
homo-decoupling is installed into preamplifier housing and works properly.
With best wishes and kind regards, Yuri Strelenko.
>Dear BUMlanders,
>
>Numare's AC-200 NMR system was installed by Bruker engineers in the summer of
>1994. The system is 1983 vintage with Aspect 3000 computer, array processor,
>and process controller. It works fine with one notable expection: The
>preamp housing relays do not work. A second preamp housing sent as a
>replacement has the same problem.
>
>Bruker engineers were unable to solve the problem. My solution has been to
>manually connect the high power decoupler to the 1H probe coil input every
>time that proton decoupling is required. This works ok for hetero
>decoupling. Homo decoupling is another matter. Instead of DP ca. 20L for
>routine homo decoupling, need DP 0L due to severe attenuation of rf as it
>passes through the preamp housing. Can't bypass the problem in this case.
>
>Question: Has anyone had the same problem? Did you work out a solution?
>Any help will be greatly appreciated.
>
>Thank you and best regards,
>
>Lawrence
>
>--------------------------------------------------------
>Numare Spectralab, Inc.,
>10 Summit Avenue, Unit 6, P.O. Box 96,
>Berkeley Heights, NJ, 07922-0096,
>Telephone 908-665-0066
>Telefax 908-464-4192
>
>Name: Lawrence Byrnes
>E-mail: numare@cnj.digex.net (Lawrence Byrnes)
>www: http://www.cnj.digex.net/~numare/
>--------------------------------------------------------
>
>
>
-- ********************************************************************* | Dr. Yuri A. Strelenko | | | N.D.Zelinsky Institute | Fax (7-095) 135 5328 | | of Organic Chemistry, | Tel (7-095) 135 9094 | | Leninsky prospect 47, | e-mail strel@nmr1.ioc.ac.ru | | 117913 Moscow B-334, | | | Russia | | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^