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SOTAbeams LASERBEAM-VARI Digital Variable Bandwidth Audio ...
https://www.dxengineering.com/search/part-type/audio-dsp-and-equalization-devices/product-line/sotabeams-laserbeam-vari-digital-variable-bandwidth-audio-filter-module
SOTAbeams LASERBEAM-VARI Digital Variable Bandwidth Audio Filter Module - the perfect addition to your project or your existing radio. Unlike analogue filters, digital filters provide near-perfect characteristics. Because of the way that they are implemented, they are better than analogue filters in almost every way!
SOTAbeams LASERBEAM-VARI Digital Variable …
https://www.dxengineering.com/parts/sbm-lb-vari
SOTAbeams LASERBEAM-VARI Digital Variable Bandwidth Audio Filter Module LB-VARI •Bandwidth 200Hz - 3500Hz •Max Passband 200Hz - …
Amateur Radio - Variable Band-width Audio Amplifier
http://vu2ppp.com/_variable_band-width_audio_amplifier
For swichable bandwidth of audio filter, R can be chosen as 4.7K for CW and 1.0K for SSB reception. For continuously variable bandwidth, use 5K pot in series with 470Ω resistance. Fig. 2 shows the filter response for R = 4.7K, having peak …
VARIABLE BANDWIDTH CW FILTER - rason.org
https://rason.org/wp-content/uploads/2021/03/cwfilter.pdf
VARIABLE BANDWIDTH CW FILTER As the sunspots return and DX propagation conditions to improve, the age old problem with QRM begins to show up on the amateur bands. Fortunately, help is at hand. The circuit in figure 1 is a variable bandwidth CW filter using two IC’s. The first IC is a 741 op amp used as an active filter and the second
LASERBEAM-VARI digital variable audio filter module
https://radioaficion.com/news/laserbeam-vari-filter-module/
One simple control allows you to continuously vary the bandwidth or the centre frequency of the filter. All settings produce the same great filters …
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