Figure 1.5:
Sideband Suppression
"... the sideband suppression as measured using a typical
audio frequency of 4 kHz is plotted for eight several scanner
frequencies spanning the ESI phantom's operational range
characterisation test 3 above.
Again a very high suppression of approximately 53 dB is obtained over the operational range of the phantom. The slightly lower suppression observed at 2 MHz is due to a fractionally higher inductance used in the parallel tuned phasing circuit causing imperfect quadrature phase shifting. This has since been rectified by changing to a lower inductance coil for this filter."
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