‰  NOW 25 WPM  ‰  TEXT IS FROM JANUARY 2017 QST  PAGE 62‰

THIS WORKS BECAUSE MODERN FILTERS USUALLY HAVE FAIRLY STEEP SKIRTS TO ALLOW
EXCLUSION OF UNWANTED SIGNALS.  A SINGLE STAGE AUDIO FILTER, SUCH AS THE
ONE IN THIS KIT, HAS SIDE SLOPES FILTER SKIRTS THAT ARE MUCH MORE GRADUAL.
RATHER THAN TRYING TO ELIMINATE UNWANTED STATIONS, YOU WILL PROBABLY SET
THIS FILTER TO GET THE MAXIMUM VOLUME FROM THE STATION YOU WANT TO COPY.
THERE IS AN UNEXPECTED BENEFIT TO A FILTER SUCH AS THIS.  ALTHOUGH THE
NUMBERS DONT SEEM TO INDICATE IT, THE 500 HZ BANDWIDTH FILTER WITH GRADUAL
SLOPES IS SUFFICIENT TO ALLOW COPY OF SSB SIGNALS.  AGAIN, PLACE THE FILTER
CENTER TO MAXIMIZE THE DESIRED STATION SO AN INTERFERING STATION TO THE
SIDE WILL BE ATTENUATED TO SOME EXTENT.  HOW WELL IT WORKS  ALTHOUGH A 500
HZ FILTER WITH LESS THAN SHARP SKIRTS DOES NOT SOUND ATTRACTIVE COMPARED TO
WHAT YOU MIGHT BE USED TO IN YOUR MODERN TRANSCEIVER, THERE IS NO QUESTION
IT HELPS WITH A DIRECT CONVERSION RECEIVER OR OTHER SIMPLE DESIGN WHERE
‰  END OF 25 WPM TEXT  ‰  QST DE W1AW  ƒ