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The Swezey Digital Filter - Realtime Audio Filtering For ...
http://www.winternet.com/~swezeyt/dsp/dspSwl/dspSwl.htm
The Swezey Digital Filter Realtime Audio Filtering For Shortwave Listening (SWL) "Making the WORLD sound better one PC at a time!" Connect the audio "Line Out" on your shortwave receiver to the "Line In" on your computer's sound card. Then run the program to digitize the input, filter it and play it out through your computer's speakers
JPS NIR-10 Audio Filter NIR10 - Universal Radio
https://www.universal-radio.com/catalog/filters/nir10.html
Audio Filter Discontinued! JPS NIR-10 SWL Audio Filter Discontinued! Please check our Used List. Recently sold used. Discontinued Audio Filters The JPS NIR-10 audio filter allows reception of difficult to read signals and reduces listener fatigue. Operates on radio receiver audio outputs then provides its own volume-adjustable processed audio to an external 3 to 8 ohm speaker …
SWL, Shortwave Radio
http://www.bobsamerica.com/swl.html
filters from 20KHz through 35+MHz, Input/Output selection, Preamp, 100KHz Marker, 10MHz Upconverter. W-J 8718A with ISB and 5KHz to 30MHz coverage. W-J DMS 105A-2 Demodulator for AM, SSB, CW, multiple filter selections, and passband tuning capability. W-J 8718 MFP (microprocessor front panel) with same capabilities as the manual unit above.
Low Pass Filter For SWL? | RadioReference.com Forums
https://forums.radioreference.com/threads/low-pass-filter-for-swl.250127/
The real use for the low-pass filter is to allow your 400watt PEP transmitter to radiate properly, but the filter blocks any slight (hopefully!) radiation from harmonics or over-driving getting into your neighbours TV or VHF radio.
Discontinued Audio and RF Filters - Universal Radio
https://www.universal-radio.com/catalog/filtdisc.html
NF-60 Audio Filter: NIR-10/NIR-10 SWL Audio Filters: NIR-12 Audio Filter: NRF-7 Audio Filter: NTR-1 Audio Filter: Kiwa: BCB Rejection BCB RF Filter; 500 kHz Low Pass Low Pass Filter; MAP Sync Detection & Filter; MFJ: MFJ-722 SSB/CW Audio Notch Filter; MFJ-752C Audio Filter: NCS: NCS-3230 Audio Console; NCS-3240 Audio/Mic Console: SGC: ADSP 2 DSP Module: Stoner: FC-11 …
CW Audio Filter - Rob's Blog
https://robs-blog.net/2015/12/15/cw-audio-filter/
The filter width is ultra narrow. being only 200hz wide, so 100hz either side of the centrer frequency i should hear a fair bit of attenuation. This is a contest type filter, for very crowded bands. I will also build a 400hz filter for more casual listening or band searching and a 2K SSB filter for SWL’ing.
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