‰ NOW 20 WPM ‰ TEXT IS FROM SEPTEMBER 2015 QST PAGE 53‰ HAD AN AUDIO OUTPUT LEVEL ADJUSTMENT, THEN THESE LEVELS COULD BE SET PROPERLY AND THE OUTPUT SPEAKER OR HEADPHONE LEVEL COULD BE OPTIMIZED BY THE USER. CONCLUSION THE MFJ 752D IS AN EXTREMELY VERSATILE AUDIO FILTER THAT IS PARTICULARLY USEFUL FOR OLDER RECEIVERS WITH MINIMAL FILTERING. HIGH PASS, LOW PASS, BAND PASS, AND PEAK AND NOTCH FILTERING ARE SUPPORTED, ALONG WITH SSB AND CW NOISE REDUCTION CIRCUITRY. IDIOM PRESS SCAF 1 SWITCHED CAPACITOR AUDIO FILTER THE SCAF 1 IS A LOW PASS FILTER ONLY. THE SWITCHED CAPACITOR FILTER IS A HIGH PERFORMANCE, ACCURATE, TUNABLE ANALOG FILTER THAT PROVIDES OUTSTANDING FILTER ROLL OFF. QST PUBLISHED AN EXCELLENT ARTICLE ON THIS TECHNOLOGY MORE THAN 30 YEARS AGO, AND IT IS WORTH REVIEWING. THE SCAF 1 IS AVAILABLE AS EITHER A KIT, OR ASSEMBLED AND ‰ END OF 20 WPM TEXT ‰ QST DE W1AW ƒ