CALF – the Configurable Audio Limiter Filter – Combines an audio limiter circuit along with up to 6 stages of bandpass filteringDesigned by 3rd Planet Solar / KC9ON, Ships from United States of America
What is it? 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...Read More…
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 has these features:
Limiter helps to reduce crashes from QRN or can aid in weak signal reception
6 stages of Op Amp filtering, 5 switch selectable, offering various bandwidths from 700-100Hz on a 700Hz center frequency
Built in 1W Audio amplifier drives headphones or a small speaker.
Controls mounted on a front panel PCB for ease of use
Stages can be split and re-arranged via jumper blocks – Want to put the limiter in the middle of the filter stages? No problem!
Optional IC Sockets are included to change and experiment with different R/C values and filter modes – Make Bandpass, Lowpass or Highpass filter stages!
CALF will reduce the QRM (other signals), QRN (Static crashes), and help dig out weak signals (via limiter overdriving).
CALF is a kit - soldering assembly is required, the enclosure is included.
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Amateur radio operated licensed in 1979 - before I could drive. Retired from long career of electronic manufacturing and IT systems. Semi-retired as a tinkerer of electronics.