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NESCAF – QRP Club of New England
https://www.newenglandqrp.org/nescaf/
We are happy to once again make the New England Switched Capacitor Audio Filter (NESCAF) available to the QRP community. Please be aware that the NESCAF board is approximately 2″ x 2″ (5.08cm x 5.08cm). It’s all through-hole construction, i.e. not a bad build, but we recommend a soldering iron in the 20-30W range.
NESCAF Audio Filter - wb0smx.net
http://www.wb0smx.net/?p=1256
NESCAF Audio Filter. The NESCAF audio filter is kitted by the New England QRP Club. Â It is intended to be a CW filter with continuously variable bandwidth from about 90 hz to about 1500 hz. Â The center frequency is adjustable from about 150 hz to about 1000 hz. The filter uses a Switched Capacitor Audio Filter Chip (MF10, LMF100 or LTC1060 ...
The NEScaf Story – QRP Club of New England
https://www.newenglandqrp.org/nescaf-a-switched-capacitor-audio-filter/
The NEScaf is a switched capacitive audio filter. It is designed to be simple to build and use. It is more flexible than previous filters for QRP rigs. It has two panel-mounted controls — a single center-detent potentiometer that sets the center frequency of the filter’s bandpass (default value settable between ~415Hz and ~1kHz), and a dual ...
NEScaf audio filter - QSL.net
https://www.qsl.net/iw1bco/NEScaf.html
The New England QRP Club NEScaf is a switched capacitive audio filter kit. It has two panel.mounted controls: a singlecenter-detent potentiometer that sets the center frequency of the filter's bandpass (default value settable between abouth 415 Hz and 1 KHz), and a dual-ganged potentiometer that provides a continously variable bandwithcontrol (from abouth 60 Hz to …
NEScaf Audio Filter
http://www.wa0itp.com/nescaf.html
NEScaf Audio Filter. This is a very capable and user friendly switched capacitor audio filter. It is a kit offering from the New England QRP club, and is very reasonably priced at $35. This from their web site: The NEScaf is a switched capacitive audio filter based on the MF100 chip. It is designed to be simple to build and use.
N5ESE's Version of the NESCAF (20070117)
http://www.n5ese.com/nescaf.htm
The NESCAF uses a National MF10 chip to implement a 4th-Order Butterworth Bandpass audio filter. Using the Butterworth topology results in a smooth filter action with little or no ringing, but compromises on the skirt selectivity somewhat. Even so, the filter can provide dramatic results.
Wiring Manual NEScaf - QRP Club of New England
https://www.newenglandqrp.org/wp-content/uploads/2017/06/NEScaf_201107.pdf
The NEScaf is a switched capacitor audio filter (acronym SCAF) built around a “building-block” type filter chip. The NEScaf will take the audio from any source (rig) and filter it to suit your listening…which is called a bandpass filter. The filter has two controls: 1. the ...
NEScaf Audio Filter | QRZ Forums
https://forums.qrz.com/index.php?threads/nescaf-audio-filter.495486/
Finally, I switch in the audio peak filter to enhance the single, wispy signal that I need to copy. I built the NEScaf filter last year to use with my older IC-746PRO. Currently, the filter is unused because the 746PRO has taken a back seat to my KX3. If interested in an already-built NEScaf filter, just send me an email: my call at arrl dot net.
SCAF audio filter build – Dhakajack
https://blog.templaro.com/scaf-audio-filter-build/
The NESCAF filter is designed around a family of versatile switched capacitor filter chips. The grand-daddy of the family is the MF10, but more modern versions exist (e.g., the pin-compatible LMF100 or the LTC1060) and have better performance. Each of these chips has two 2nd order filter stages, which can be configured as low pass, high pass ...
https://groups.io/g/ft817/topic/44908223
Also, their are "outboard" switched capacitance audio filters that help a lot. No help with adjacent channel overload, but can give you a very narrow audio pass band. NESCAF filter kit, for example, or one at wouxun.us 73 /paul W3FIS
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