GC_ET_AFX_CW_Filt7N.html

2021-01-06   06:49:59

      AFX-7N-Q34

*** Yet Another Analog CW Filter ***  AFX-7N-Q34 ***  ( click image )

*** Twin Notch Filters around a CW Filter,  Notch Max "Q"=7 .
*** The  AFX-7NN  has broader Top Band and Steep Sides at v=17 .
*** 7NN Design utilizes Twin Notches for Narrow PassBand, rather than narrow filters.
*** This 6 stage design is not as good as ANN, and more complex than the standard AFX.

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*** Yet Another Analog CW Filter ***  AFX-7N-AN-Q345 ***
 ( click image )

*** Twin Notch Filters around a CW Filter,  Notch  "Q"=7  and "Q"=10
*** The  AFX-7NN  has broader Top Band and Steep Sides at v=7 .
*** 7N-AN  Design utilizes Twin Notches for Narrow PassBand, rather than narrow filters.
*** This mutli stage design is very good and easier to tune than the ANN , but more complex than standard AFX.

AFX_7N-AN-Q345-x-2_summary
f( 700 )f( Notches ) staggered at 550, 630, f(700), 770, 850 Outer "Q"=7, Inner "Q"=10
Additional  stage at "Q"=3 to drop sidebands further. 

measurement:
"CW150" Q=3+3  BW=150___v=28  without notches, on Gausian Curve ( not used ).

"NetSum"__mQ=5.6___T=90___ BW=125-170___v=5___800=-20dB___1000=-12dB

"N" Summary: MEASURED:  "N" final stage example is Q=3 stage.
cQ=3.0__T=76__BW=107, 179mQ=6.5__T=75 __BW=110__v=8__800=-21dB___1000=-20dB 

Results:  Notches make far more difference than final "Q"  

   AFX_7N-AN-Q345-x-2_summary

measurements :

"NetSum"__mQ=5.6___T=90___ BW=125-170___v=5___800=-20dB___1000=-12dB

"N" Summary: MEASURED:  "N" final stage example is Q=3 stage.
cQ=3.0__T=76__BW=107, 179
mQ=6.5__T=75 __BW=110__v=8__800=-21dB___1000=-20dB 

This BW = 110 at -3 dB and 180 at -12 dB.   Steepness of bandpass (slope of best fit) is v=8.  
This Steep BandPass is similar to that obtained by DSP filtering, within the top 24 dB  range of the ear. 

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