Page 2 of article
| It is a very simple set up made of 2 integrated circuits which is able to filter the audio signal .Therefore it is not dedicated to ATLAS 210 but can be also used on any receiver .The description was done in the Radio Ref Magazine in feb 1982 . The audio band pass can be adjusted from 200 to 4000 hz by just rotating a potentiometer.Thanks to the digital filter it has a very steep slope (100 db/octave) .It needs only 2 integrated circuits which are still easy to get in 2006 (MC 14144 and 555 ). F3UE , a french expert in ATLAS-210 revamping , build the whole thing and is very satisfied with the results .For convenience we put here a copy of the RADIO REF article | |
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