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  • CW Filter Kit - Building the W3NQN CW Filter Kit Step by Step by AK3W
    [ Hits: 323 | Votes: 0 | Rating: 0.00 ]
  • CW Notch Filter - Homebrew CW notch filter project by KN9B
    [ Hits: 385 | Votes: 0 | Rating: 0.00 ]
  • Design RF Filter
    [ Hits: 1233 | Votes: 2 | Rating: 4.50 ]
  • Easy bandpass filters - Quick and easy bandpass filters for receiver input by George Dobbs G3RJV
    [ Hits: 1921 | Votes: 1 | Rating: 9.00 ]
  • Filtering of the Icom IC-775 DSP - Replacing filters on ICOM IC 775
    [ Hits: 367 | Votes: 5 | Rating: 6.40 ]
  • Filters and Ferrites in EMC - This article is about the characteristics and use of various filters and ferrites for solving amateur radio electromagnetic compatibility problems involving breakthrough of amateur signals into domestic equipment such as television sets, video recorders stereo sytems etc.
    [ Hits: 792 | Votes: 0 | Rating: 0.00 ]
  • Filters for NDB reception - RF Filters to help with NDB reception problems
    [ Hits: 993 | Votes: 1 | Rating: 10.00 ]
  • High Pass Filters - Understand how high pass filters are done
    [ Hits: 513 | Votes: 0 | Rating: 0.00 ]
  • High-Pass Filter Design - Online high pass filter design page with introduction to high-pass filters by K7MEM
    [ Hits: 540 | Votes: 2 | Rating: 1.00 ]
  • Highpass filter calculator - Butterworth Highpass Filter Designer
    [ Hits: 283 | Votes: 4 | Rating: 2.75 ]
  • Homebrew a CW Filter - An home-brewed morse code CW filter with a central frequency of 800hz and a variable bandwidth from 230hz to 26hz by F5RDH in french.
    [ Hits: 1608 | Votes: 2 | Rating: 2.50 ]
  • Homebrew Crystal Filter Design - Desgining crystal filters and find out crystal data by measuring it.
    [ Hits: 498 | Votes: 7 | Rating: 7.00 ]
  • How to make a mains filter for EMC and noise reduction - Article showing how I've made a mains filter to reduce EMC in the electricity supplying my shack. I've used a type 31 Fair-Rite ferrite core and the video shows how this performs on 160m through to 40m.
    [ Hits: 736 | Votes: 3 | Rating: 10.00 ]
  • Inrad Roofing Filter in the Yaesu FT-920 - Insalling Inrad roofing filter in the FT-920 with pictures and comments
    [ Hits: 676 | Votes: 2 | Rating: 9.50 ]
  • Interdigital bandpass filter designer - Fill out the form to design a bandpass filter as described in the January 1985 issue of Ham Radio Magazine. These filters are generally limited to frequencies above 200 MHZ because their size is slightly longer than 1/4 wavelength
    [ Hits: 979 | Votes: 6 | Rating: 7.67 ]
  • Interferences and filtering - General information on Filter passbands, interferences, TVI and RFI problems
    [ Hits: 1079 | Votes: 1 | Rating: 10.00 ]
  • K2TR Coax Stub Filters - Multi transmitter filters
    [ Hits: 2887 | Votes: 7 | Rating: 6.43 ]
  • K3NA stub design
    [ Hits: 655 | Votes: 0 | Rating: 0.00 ]
  • KI5YN QLF Filter - The QLF filter is a microprocessor based interface designed to go between a standard Morse code key and a radio transmitter
    [ Hits: 1810 | Votes: 3 | Rating: 4.67 ]
  • LC Filter Design - This is an interactive design package for designing analogue (i.e. hardware) filters made of inductors and capacitors (Ls and Cs).
    [ Hits: 1362 | Votes: 4 | Rating: 6.75 ]
  • Low Pass Audio Filter - 440 Hertz peaked low pass audio filter experiments
    [ Hits: 806 | Votes: 1 | Rating: 7.00 ]
  • Low Pass Filter Construction - Low Pass Filter Module Construction Manual
    [ Hits: 892 | Votes: 0 | Rating: 0.00 ]
  • Low Pass Filters - Article explaining electronic network of low pass filters
    [ Hits: 720 | Votes: 0 | Rating: 0.00 ]
  • Low-Pass Active Filter Designer - Javascript filter design page with introduction to low pass filters by k7mem
    [ Hits: 489 | Votes: 1 | Rating: 1.00 ]
  • Lowpass filter for 30m - 30m lowpass filter for the Softrock Ensemble RXTX tranceiver.
    [ Hits: 192 | Votes: 0 | Rating: 0.00 ]
  • Lowpass filter for 5MHz - The following lowpass filter was built using the tables in the arrl manual, it is a 5 section one and seems to work ok
    [ Hits: 185 | Votes: 2 | Rating: 4.50 ]
  • Mode J Desense Filter - This type of filter can be used in a Mode J satellite station (uplink on 2m, downlink on 70cm) to reduce the problem of the uplink signal desensing the receiver
    [ Hits: 1042 | Votes: 2 | Rating: 5.00 ]
  • Narrow Band-Pass filter for HF - Band-pass filters can be critical components in competitive stations. This setup may help put your station on the map.
    [ Hits: 2060 | Votes: 1 | Rating: 1.00 ]
  • Noise Bridge Tuner Tuner - Noise bridge circuit to tune your tuner
    [ Hits: 277 | Votes: 1 | Rating: 10.00 ]
  • Notch Filter Designer - Online calculator, Butterworth Bandstop (Notch) Filter Designer
    [ Hits: 635 | Votes: 6 | Rating: 3.33 ]
  • Novel filter for sat working - Elimiate QRM when working with satellite antennas
    [ Hits: 376 | Votes: 0 | Rating: 0.00 ]
  • Online Microwave Filter Design and Analysis - This site is dedicated to design and analysis of micro- and millimeter wave filters from 0.5 to above 100 GHz.
    [ Hits: 518 | Votes: 8 | Rating: 7.50 ]
  • Passive CW headphone filter - This filter is a plug in adapter that has no batteries but gives very good performance by G8MNY
    [ Hits: 1099 | Votes: 1 | Rating: 1.00 ]
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