[TenTec] 221 Filter (was Inrad taking orders for Omni VI roofing filter)

[Barry N1EU]

 My previous posting on the subject assumed a 750hz center for the Inrad roofing filter.  If the center freq is actually 700hz, the lower knee of the 221 filter will intersect the roofing filter's response at -6dB (and not -10dB).  So what you would end up with downstream of the 221 would be a flat passband for the 125hz passed above the center freq of 500hz (i.e., 500 - 625hz sidetone) and a downward sloping passband for the 125hz below the center freq to -6dB at 375hz sidetone. 73,Barry N1EU----- Original Message ----- From: "Chuck Guenther" Doing this for the standard CW roofing filter (BW = 600 Hz and Center Freq.= 700 Hz) and the 221 filter (BW = 250 Hz and CF = 500 Hz) will show thatthe lower -6db cutoff frequency of the composite response will fall ABOVEthe lower cutoff of your 221 filter,

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