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The CALF: A Selectable Audio Filter

http://www.kc9on.com/wp-content/uploads/2014/11/CALF-QQ0415_36-39.pdf

Introducing the CALF An audio filter is a useful accessory for any receiver lacking desired selectivity, or as a building block in a direct conversion receiver. Particularly in many vintage and home brew receivers it has been a steady theme to consider adding audio filtering.

Calf Studio Gear - GNU/Linux Audio Plug-Ins

http://calf-studio-gear.org/

Calf Envelope Filter This plug-in is also known as Auto-Wah - a filter following the envelope of a signal. The Calf version provides a couple of filters to choose from together with some fine grained settings of the envelope to frequency calculation like setting a curve from convex over linear to concave.

CALF the CW Audio Limiter Filter Kit from 3rd Planet Solar ...

https://www.tindie.com/products/3rdPlanetSolar/calf-the-cw-audio-limiter-filter-kit/

CALF – the Configurable Audio Limiter Filter – Combines an audio limiter circuit along with up to 6 stages of band pass filtering to aid in SSB/SWL and CW receiving. Filtering bandwidth centered on 700Hz and ranges from 700Hz to less than 100Hz while the limiter circuit can be used to reduce large static crashes or aid in weak signal reception.

Calf Audio Filters & Plugins - Open Source BroadcastOpen ...

https://www.opensourcebroadcast.com/calf-audio-filters-plugins

A collection of Open Source Linux audio filters for use with Jack audio server or Ardour audio software. This entry was posted in Audio production . Bookmark the permalink .

Calf Audio

http://calfaudio.com/

eHam.net

https://www.eham.net/reviews/view-product?id=13314

For a long time, I have been looking for an audio filter to optimize my CW experience with an ICOM 718. I think I have found it—the CALF from 3rd Planet Solar/KC9ON. Having owned three other audio filters, I am especially impressed by the CALF, a reasonably priced analog filter with an ideal combination of selectivity and flexibility.

CALF; Quite An Amazing Device! | QRZ Forums

https://forums.qrz.com/index.php?threads/calf-quite-an-amazing-device.791347/

I like mine a lot. Of my small "collection" of AF filters, the CALF is my favorite. Maybe John will bring the kit out of retirement some day. My FT-817 doesn't have the internal CW filter. The CALF works wonders with that rig. And, it was a fun build.

CW Bandpass audio filter plugin - adjustable Q, …

https://www.youtube.com/watch?v=1RP6Lqn24zE

brief demo of the CALF EQUALIZER 5 BAND LV2 audio filter pluginused as a CW AUDIO BANDPASS FILTER with many adjustable parameters https://calf-studio-gear.o...

Do I need a cw filter? | Page 2 | QRZ Forums

https://forums.qrz.com/index.php?threads/do-i-need-a-cw-filter.592664/page-2

THE no soldering alternative will be an outboard CW audio filter between the rig and an outboard speaker / headphones. I recommend either of the Autek QF-1's, or one of MFJ's peak/notch tunable. The big MFJ DSP is a bit overkill and pricey. Audio filters too are found used at …

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