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The Idiom Press SCAF-1 Audio Filter
https://www.hamsupply.com/wp-content/uploads/2016/07/SCAF_Review.pdf
3.5 kHz. The SCAF-1 rolls off, or atten-uates, audio signals at 96 dB per octave (audio frequency doubles or halves by octaves) above whatever cutoff fre-quency is set. Also of importance to me is the filter’s small size. It measures 315/16" W × 1/2" H × 51/16" D. Only one connection between the SCAF-1 and radio is required. A shielded cable from
Logikit SCAF-1 - the Deceptively Simple Filter
https://qrznow.com/logikit-scaf-1-deceptively-simple-filter/
Using a modern but little known technology called SCAF filtering, the SCAF-1 is an active audio low pass filter offering user control of the filter …
Ham Supply / Idiom Press SCAF-1 Bandpass Filter …
https://www.hamsupply.com/modified-scaf-1-noise-filter/
About a year ago, I built an Idiom Press SCAF-1 audio filter to use with my modern transceivers in CW applications. Recently, I decided to modify a SCAF …
eHam.net
https://www.eham.net/reviews/detail/3075
The new SCAF-1 filter from Ham Supply/Idiom Press makes your radio listener friendly, whether you are an SSB or CW operator. Using a modern but little known technology called SCAF filtering, the SCAF-1 is an active audio low pass filter offering user control of the filter cut-off frequency, yielding a stunning 96dB per octave roll-off of signals above the cut off frequency, and no white …
eHam.net
https://www.eham.net/reviews/view-product?id=3075&page=9&per-page=10
The SCAF-1 is an outboard audio filter that has a pot for adjusting the BW of the audio with at least 90dB skirts. The SCAF-1 virtually eliminates white noise and most hetrodynes as well as narrows the BW of the signal to eliminate interfering stations in the same passband. Super on CW!
SCAF audio filter build – Dhakajack
http://blog.templaro.com/scaf-audio-filter-build/
The filter bandwidth is controlled by two ganged 50k ohm potentiometers, with a section devoted to each filter stage. The center frequency is driven by dividing a time base by 100. A 555 timer outputing 70 kHz will result in a 700Hz center …
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