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Variable CW and SSB audio filter – uBitx
https://ubitx.net/2018/09/02/variable-cw-and-ssb-audio-filter/
Variable CW and SSB audio filter. Andy RW9RN has developed a wee circuit for insertion in the audio line to provide variable bandwidth control for CW and SSB. He has a video about it here. Reference.
Audio Filter for CW and SSB - Wouxun
http://www.wouxun.us/item.php?item_id=305
Weight 2.8 oz. This switched capacitor audio filter is a compact, useful accessory for the X1M or any other transceiver. It is a very useful device to sharpen the pass band for CW work, plus it may be set for SSB voice reception. The center frequency is adjustable from 400 to 1100 Hz and bandwidth is adjustable from 60 to 1800 Hz.
External Audio DSP Filter Module for SSB & CW, FT8x7 DSP ...
https://elekitsorparts.com/product/external-audio-dsp-filter-module-for-ssb-cw-ft8x7-dsp-filter
Get yourself a Funtronics FADS-02 external audio filter module. The QSOs will get much more straight-forward with this tiny external audio DSP module. The FADS-02 is an audio digital filter which is designed to eliminate and filter out the unwanted noises and interferences in a SSB or CW QSO by using the software algorithms called DSP.
Four State QRP Group
http://www.4sqrp.com/ssbmite.php
The SSB-MITE has a number of assembly options depending on how it is to be used. It can be used as an outboard filter and amplifier, plugging into the headphone jack of an existing receiver, and driving a speaker or headphones. The SSB-MITE can be used as a high gain audio filter and speaker driver in conjunction with a homebrew receiver.
MAX293 Audio SSB filter.. By F6BQU Luc Pistorius - …
https://www.youtube.com/watch?v=Ae02ny4JBy8
MAX293 Audio SSB filter.. By F6BQU Luc Pistorius http://lpistor.chez-alice.fr/passebas.htm
Autek Research SSB / CW / AM audio filter, QF-1A ...
https://www.youtube.com/watch?v=2GyAG0WCzQQ
Project complete. I demonstrate its operation.Donations accepted: paypal.me/PayKlondikeMike
W4NEQ SSB audio
http://w4neq.com/htm/hamaudio.htm
Traditional ssb transmitters generate double sideband using a balanced modulator, then pass only usb or lsb through a crystal filter, the width of which determines the maximum audio bandwidth (frequency response).
Using Audio Equalizers to Improve SSB Communications
http://www.na0tc.org/lib/exe/fetch.php?media=technical:equalization_presentation_nov_6_2010.pdf
Using Audio Equalizers to Improve SSB Communications 10/21/2010 1 ... •“Matched filter” detection •Most modern radios have adequate filtering •Reduce receiver noise figure: • Will not help when atmospheric noise is dominant •Frequently the case on the low HF bands
DX Audio Filter Circuit - ElectroSchematics.com
https://www.electroschematics.com/dx-audio-filter/
However, if one wants to use a wide bandwidth receiver to listen to amateur SSB and CW stations with the least amount of interference, this dx audio filter circuit can be of great help. This audio band filter cleans out the unwanted noise. It is a state variable type of filter, a bandpass filter with a variable center frequency and bandwidth.
K4ICY's Home Brew CW Audio Filter
http://www.k4icy.com/cwfilter.htm
The Kenwood TS-130SE was placed in the 3 kHz wide SSB mode to allow a lot of noise and adjacent signals in. You should be able to barely hear the CW letter "D" (-..) in the audio, this signal was pre-tuned to match the sidetone of the rig at roughly 732 hz. The filter set at 750 Hz would have no problem with the sidetone.
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