rd - 1962 - ENC Conference
rd - 1962 - ENC Conference
rd - 1962 - ENC Conference
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SPIN DECOUPLER<br />
by<br />
Daniel D. Elleman and Stanley L. Manatt<br />
Physical Sciences Division<br />
Jet Propulsion Laboratory<br />
California Institute of Technology<br />
Pasadena, California<br />
The spin decoupler which is shown in the figure employs a<br />
phase detector quite similar to that used in the Varian integrator 1.<br />
(i) LeRoy F. Johnson, "Operation of an NMR Integrator System," is<br />
"NMR and EPR Spectroscopy," by Varian Staff and Consultants,<br />
Pergamon Press, 185 (1960).<br />
The IN216 diodes used in the phase detector are a matched<br />
pair and are imbedded in a copper block to maintain them at a constant<br />
temperature. Ten turn pots have also been used in the phase shifter<br />
and audio amplitude section so as to give a little better control in<br />
these settings. Also, 0.022 ~f capacitors have been placed at the<br />
output to the sweep coils to attenuate the modulation. A switch, not<br />
shown in the diagram, has been added so that these capacitors can be<br />
shorted so the full output of the audio amplifier can be placed on the<br />
sweep coils.
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