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W3NQN Band pass filters, W3NQN BPF - Array Solutions
https://www.arraysolutions.com/w3nqn-filters-info
W3NQN Band Pass filters are the best single band filters you can buy. Each one is hand-made by K7MI to W3NQN's specifications. The performance of these W3NQN design filters, regardless of who assembles them is the same. We will …
Building the W3NQN Passive Audio Filter
http://www.wb2art.com/docs/filter.doc
The May, 2002 QST, page 96 (QRP Power) mentioned a neat item, called a passive audio filter. I’d heard of these, but never used one. I emailed Rich, K7SZ, editor of the QST QRP column, and he suggested I contact Ed, W3NQN directly.
W3NQN CW Audio Filter - Resource Detail - The DXZone.com
https://www.dxzone.com/dx29646/w3nqn-cw-audio-filter.html
About W3NQN CW Audio Filter The resource is currently listed in dxzone.com in a single category. The main category is Filters manufacturers that is about Band Pass Filters. This link is listed in our web site directory since Saturday Apr 12 2014, and till today "W3NQN CW Audio Filter" has been followed for a total of 273 times.So far no one has rated yet, so be the first to rate this link !
eHam.net
https://www.eham.net/reviews/view-product?id=58
The W4ENE/W3NQN audio filter is used with either a pair of 8-ohm mono headphones (such as the famous Kenwood HS-5) or a single speaker and thus has audio transformers on its input and output so it can simply plug into the extension speaker socket of a transceiver or receiver, with the supplied quarter-inch/6 mm jack-plug flying lead.
MODIFYING THE W3NQN PASSIVE CW AUDIO FILTER TO …
http://qrqcwnet.ning.com/profiles/blogs/modifying-the-w3nqn-passive-cw
MODIFYING THE W3NQN PASSIVE CW AUDIO FILTER TO INTERFACE WITH YOUR COMPUTER'S SOUND CARD ARTICLE IS HERE. ED, W3NQN. has made a special price offer to sell just the w3nqn parts for this project at ($23 postpaid) to anyone interested in building this modified "iCW - w3nqn" filter. - see Ed's announcement HERE NOTE: (you have to supply your …
Toroids, Ferrites, Parts, Kits, Toroid King, QRP Erector Set
https://www.kitsandparts.com/W3NQN_filter.php
Transmit Band-Pass Filter LINKS "Multi-band TX BPF Project" by 5B4AGN (pdf 627.4 KB) "100 W - Bandpassfilter nach W3NQN" by DL2NBU (pdf 706.7 KB) [German/Deutsch] "Clean Up Your Signals with Band-Pass Filters" by W3NQN (pdf 218.9 KB KB) "Receiver Band-Pass Filters Having Maximum Attenuation in Adjacent Bands" by W3NQN (pdf 342.8 KB)
A Passive LC Audio Filter For Amateur Radio Use
http://www.genebitsystems.com/david/AudioFilter/A_Passive_LC_Audio_Filter.pdf
Edward E. Wetherhold, W3NQN, is a recognized authority and designer of high-performance filters for use by the amateur radio community. His filter designs cover the spectrum from audio through RF and are used in both transmitting and receiving applications. His high-frequency bandpass filters are currently available for purchase from Array ...
Clean Up Your Signals with Band-Pass Filters
http://www.kitsandparts.com/W3NQN_May_June_1998_QST.pdf
Clean Up Your Signals with Band-Pass Filters Part 1—These inexpensive, easily built filters can be the buffer you need between the signals you want to hear and send and those you don’t! By Ed Wetherhold, W3NQN An inside view of 160 meter and 10 meter BPFs housed in 21/4×21/4×5-inch (HWD) boxes equipped with SO-239 connectors at each end.
The Filters - KØZR
http://www.k0zr.com/attachments/BPF_Details.pdf
The designs herein are from W3NQN’s second-generationi bandpass filters utilizing the Cauer family of filters. The following pages are in frequency progression, beginning with 160m and working up through 10m. The details for each filter are the following: 1) Design values derived from the main referenceii and shown schemtically
GQRP Club - Low Power Amateur Radio
http://www.gqrp.com/technical2.htm
Ed Wetherhold has been the ARRL adviser on passive filters for several years and published many fine articles on audio and radio frequency passive filtering. I believe that the two articles in Short Wave Magazine still represent the best source of information for the design of good low pass filters for RF amplifiers.
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