DNF 1201A Dynamic Noise Filter
As the B.C. output becomes more negative the filters' cutoff frequency slides upwards. The filters operate anywhere from total suppression (-3dB @ 600 Hz) to wideband (-3dB @ 27kHz). The filter channels can be held in wideband mode by depressing the OUT button which feeds -18vdc into the B.C.
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March 16, 1998 11