Dear All,
We have a 45 cm horizontal bore imaging system operating at 26 MHz (0.6
Tesla). The spectrometer is an old GE 2T CSI system (we are running on the
lowband) retrofit with a Tecmag Libra. Recently, radio frequency
interferance has plagued us. The amplitude of the interferance depends on
which coil we use. The interferance appears to be frequency modulated. It
appears whether or not there is sample in the coil and appears over the
entire tuning range of the coil, 25.5 MHz to 26.1 MHz. I can terminate the
coax with a 50 ohm resistor instead of the coil and it dissappears. Thus,
it appears we are picking something up through the air.
Question: Does anyone know if there are any commercial, two-way hand held,
or ham radios that regularly transmit around 26 MHz? Also, if anyone can
think of another mechanism by which we might get this sort of interferance,
I am open to suggestions.
Thanks!
Jeff
Jeffrey H. Walton
Associate Research Physicist
One Shields Ave.
UCD NMR Facility, Bldg. MS1-D
University of California
Davis, CA 95616
(530) 752-7794 (office)
(530) 752-6480 (MS1-D lab)
(530) 754-9064 (Cruess Hall lab)
(530) 752-8109 (FAX)
jhwalton_at_ucdavis.edu
NMR Facility URL
http://www.nmr.ucdavis.edu
Received on Tue Aug 08 2000 - 12:51:36 MST