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Amazon.com: Audio DSP Digital Filter SSB CW Ham …
https://www.amazon.com/Audio-Digital-Filter-FT-817-Utility/dp/B08CMX6ZQS
Specifications: Item Type: Audio DSP Digital Filter Material: plastic+metal Size: 63x33x25MM/2.4x1.2x0.9in Color: As shown Typical current: 150 mA @ 3V DC Filter type: Audio DSP in Multi-tap FIR(CW 256 taps, SSB 2×128 taps) Oled …
Audio Filter for CW and SSB - Wouxun
http://www.wouxun.us/item.php?item_id=305&category_id=47
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
Audio Recording features, up to 512 secs in 11 channels; Specification: Supply voltage: DC 3V by 2 AA-size batteries; Typical current: 150 mA @ 3V DC; Filter type: Audio DSP in Multi-tap FIR < CW 256 taps, SSB 2×128 taps> Module size: 5mm x 33 mm (approx 2.5 x 1.3 inches) Oled display: 1.3″, with 128×64 dots
Four State QRP Group
http://www.4sqrp.com/ssbmite.php
The SSB-MITE is a high-performing SSB filter capable of being added to nearly any receiver. The SSB-MITE uses simple analog signal-processing circuitry to provide highly effective audio filtering from a simple circuit. It is designed to be very versatile, have low parts count, be inexpensive, yet provide outstanding performance.
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.
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
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 ... •Uses eight, one-pole bandpass filters (BPF) in parallel Mic Input Equalized Audio Output GainADJ 50 Hz BPF Signal Splitter..... Signal Combiner GainADJ 3200 Hz BPF Monitor …
Audio CW Filter - PARA
https://www.para.org.ph/docs/CW-Audio-Filter.pdf
to allow listening to the wide audio (ssb) from the transceiver or narrow audio (cw) via the audio cw filter. The SPDT 2 terminal On / Off mini toggle switch is to switch the battery supply On/Off to
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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