Filters

RF Filters

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  • Inrad Roofing Filter in the Yaesu FT-920 - Insalling Inrad roofing filter in the FT-920 with pictures and comments
    [ Hits: 650 | 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: 954 | Votes: 6 | Rating: 7.67 ]
  • Interferences and filtering - General information on Filter passbands, interferences, TVI and RFI problems
    [ Hits: 1063 | Votes: 1 | Rating: 10.00 ]
  • K2TR Coax Stub Filters - Multi transmitter filters
    [ Hits: 2824 | Votes: 7 | Rating: 6.43 ]
  • K3NA stub design
    [ Hits: 625 | 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: 1777 | 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: 1311 | Votes: 4 | Rating: 6.75 ]
  • Low Pass Audio Filter - 440 Hertz peaked low pass audio filter experiments
    [ Hits: 783 | Votes: 1 | Rating: 7.00 ]
  • Low Pass Filter Construction - Low Pass Filter Module Construction Manual
    [ Hits: 883 | Votes: 0 | Rating: 0.00 ]
  • Low Pass Filters - Article explaining electronic network of low pass filters
    [ Hits: 707 | Votes: 0 | Rating: 0.00 ]
  • Low-Pass Active Filter Designer - Javascript filter design page with introduction to low pass filters by k7mem
    [ Hits: 472 | Votes: 1 | Rating: 1.00 ]
  • Lowpass filter for 30m - 30m lowpass filter for the Softrock Ensemble RXTX tranceiver.
    [ Hits: 162 | 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: 1020 | 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: 1974 | Votes: 1 | Rating: 1.00 ]
  • Noise Bridge Tuner Tuner - Noise bridge circuit to tune your tuner
    [ Hits: 264 | Votes: 1 | Rating: 10.00 ]
  • Notch Filter Designer - Online calculator, Butterworth Bandstop (Notch) Filter Designer
    [ Hits: 612 | Votes: 6 | Rating: 3.33 ]
  • Novel filter for sat working - Elimiate QRM when working with satellite antennas
    [ Hits: 357 | 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: 499 | 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: 1032 | Votes: 1 | Rating: 1.00 ]
  • PC Board Filters - Offer performance comparable to tin-box filters, and except for being bigger, stack up pretty well with those expensive little helical jobs. You just have to be able to make your own PC boards.
    [ Hits: 248 | Votes: 0 | Rating: 0.00 ]
  • Power netfilter - Homebrew a Power netfilter
    [ Hits: 206 | Votes: 0 | Rating: 0.00 ]
  • Receiver Band-Pass Filters - Third-order Cauer filters can boost performance of multi-transmitter, multi-operator contest stations to the next level. The filters are practical and you donít need expensive test equipment to align them.
    [ Hits: 663 | Votes: 1 | Rating: 5.00 ]
  • RF filter basics tutorial - an overview, introduction or tutorial about the basics of electronics filters including the types of filter and the various filter design considerations and parameters
    [ Hits: 121 | Votes: 0 | Rating: 0.00 ]
  • Roofing Filters - An Introduction to Roofing Filters by ACōC
    [ Hits: 300 | Votes: 0 | Rating: 0.00 ]
  • RTLSDR Coax Stub - Cutting out the noise using a simple coax filter to improve the poor front end filtering
    [ Hits: 403 | Votes: 1 | Rating: 1.00 ]
  • Second-Harmonic-Optimized Low-Pass Filters - Sometimes we need a little more output filtering than traditional designs offer. Look at a new filter that can give you that extra boost. QST article by W3NQN
    [ Hits: 666 | Votes: 0 | Rating: 0.00 ]
  • SSB and CW Filter - A pdf file with schematics of an ssb and cw filter AF amplifier
    [ Hits: 1679 | Votes: 2 | Rating: 6.00 ]
  • Stub HF filter - Multi transmitter filters for HF Bands
    [ Hits: 422 | Votes: 0 | Rating: 0.00 ]
  • The Ladder Filter - Article by Lloyd Butler VK5BR
    [ Hits: 689 | Votes: 2 | Rating: 8.50 ]
  • The NVARC Ugly Filter Project - Project to build sets of band pass transmitting filters for reducing the interference between HF transceivers operated in close proximity
    [ Hits: 866 | Votes: 4 | Rating: 9.50 ]
  • Tunable BandPass Filter - A homemade tunable bandpass filter for all HF bands from 160m to 10m
    [ Hits: 428 | Votes: 0 | Rating: 0.00 ]
  • Tunekit - Filter Tuning Kit for Windows is a electronic filter synthesis program and a practical filter tuning aid for actually designing and building a working filter
    [ Hits: 4535 | Votes: 8 | Rating: 5.38 ]
  • TVI Filter schematic - A simple TVI Filter schematic
    [ Hits: 292 | Votes: 0 | Rating: 0.00 ]
  • UHF Reject filter - This filter is a 0.1 dB Tschebychev lowpass with a rejection of 90 dB or better at 430 MHz, and 0.2 dB insertion loss at 72 MHz.
    [ Hits: 1106 | Votes: 1 | Rating: 10.00 ]
  • Use Band Pass Filters to clean up Signals - Clean Up Your Signals with Band-Pass Filters, a two-parts article published in this PDF file from a June 1998 QST article
    [ Hits: 353 | Votes: 0 | Rating: 0.00 ]
  • Using Band-Pass Filters - Clean Up Your Signals with Band-Pass Filters
    [ Hits: 534 | Votes: 0 | Rating: 0.00 ]
  • Using ferrite for interference suppression - Excellent guide to using ferrite cores for interference suppression. Understanding and Solving RF Interference and Noise Problems by Jim Brown K9YC Audio Systems Group, Inc. PDF File
    [ Hits: 4961 | Votes: 6 | Rating: 9.50 ]
  • Variable bandwidth cw filter - As the sunspots return and DX propagation conditions to improve, the age old problem with QRM begins to show up on the amateur bands. Thif filter help you on improving reception
    [ Hits: 1021 | Votes: 3 | Rating: 4.33 ]
  • VHF Broadcast Passband Filter - VHF Broadcast Passband Filter (88 108 MHz) by DF9CY
    [ Hits: 436 | Votes: 1 | Rating: 1.00 ]
  • W3LPL Receiving Bandpass Filters - Project of receive only filters optimized for minimal loss and very high rejection of frequencies below 75% of the filter center frequency by K1TTT
    [ Hits: 857 | Votes: 0 | Rating: 0.00 ]
  • W3NQN BPF Project - W3NQN Multiband Transmitting BPF Project
    [ Hits: 729 | Votes: 1 | Rating: 5.00 ]
  • W3NQN TX filters - Building the W3NQN bandpass filters
    [ Hits: 156 | Votes: 0 | Rating: 0.00 ]
  • YCCC 6 Band Receive Bandpass filter - This is a 6 band receive only filter designed to protect your receiver front end and provide 45dB reject at the stop bands.
    [ Hits: 1468 | Votes: 2 | Rating: 9.50 ]
  • YU1LM Filters - Bandpass filters designed by YU1LM/QRP. Home brew filters for amateur radio use.
    [ Hits: 561 | Votes: 2 | Rating: 4.50 ]

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