RF Filter
A wide collection of RF Filters, band-pass filters
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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
A low pass filter circuit
A simple 7 element, Chebyshev low pass filter, rolls of at 30MHz. Attenuation is better than -40dB at 60MHz, -65dB at 90MHz, -80dB at 120MHz.
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
Band-Pass Filters for HF Transceivers
Do your multiple-transmitter field day or contest efforts suffer from intrastation interference ?
Band Filters
Experience of band filters, for a contest multi operator enviroenment
Clean Up Your Signals with Band-Pass Filters
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!
K2TR Coax Stub Filters
Multi transmitter filters
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.
A diode-switched band-pass filter
High speed silicn diodes work well as RF switches. This article describes how to use diodes for selecting two or more filters ARRL QST article by W1FB
SSB and CW Filter
A pdf file with schematics of an ssb and cw filter AF amplifier
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.
KI5YN QLF Filter
The QLF filter is a microprocessor based interface designed to go between a standard Morse code key and a radio transmitter
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.
LC Filter Design
This is an interactive design package for designing analogue (i.e. hardware) filters made of inductors and capacitors (Ls and Cs).
Design RF Filter
Audio CW Filter
A very effective AF Adaptor, with built-in noise blanker and 30 Hz CW filter modules by PA0LQ
Clean Up Your Signals with Band-Pass Filters part 2
Part 2 You're now much closer to saying goodbye to your unwanted signal problems!
RF Filter Links
Interactive Digital Filter Design
This is an interactive filter design package, for designing digital filters
[ Hits: 979 | Votes: 3 | Rating: 6.67 ]
144MHz Low-Pass / 432 MHz Notch Filter
A combined 144MHz Low-Pass and 432 MHz Notch Filter by VE2ZAZ
[ Hits: 732 | Votes: 3 | Rating: 1.33 ]
20m 30m 40m Bandpass Filters - AB2EW
Homemade LC Bandpass Filters for 20M 30M 40M In multi station environments like special events ...
[ Hits: 388 | Votes: 1 | Rating: 10 ]
23 cm filters
2 filter designs a 3-pole and a 5-pole
[ Hits: 429 | Votes: 1 | Rating: 1 ]
30 Meter Band Pass Filter - KE7HR
A homemade band pass filter for the 30 meter band based on the original VE7BPO ...
[ Hits: 598 | Votes: 1 | Rating: 6 ]
432 144 MHz Notch Filter
Combined 432 MHz High-Pass - 144 MHz Notch Filter By Bertrand Zauhar, VE2ZAZ
[ Hits: 515 | Votes: 1 | Rating: 1 ]
440Mhz Interdigital Bandpass Filter
Homebrew Amateur Radio 440Mhz Interdigital Bandpass Filter
[ Hits: 579 | Votes: 1 | Rating: 1 ]
50 MHz Terminating Low Pass Filter
This low pass filter terminates all harmonics from the 2nd to above the 10th harmonic ...
[ Hits: 541 | Votes: 0 | Rating: 0 ]
5th order High Pass VHF Filter
Sometimes many VHF UHF modern transceivers have problems with BROADCAST Interference and CROSS modulation from ...
[ Hits: 1211 | Votes: 8 | Rating: 6.12 ]
70 MHz low pass filter
An home made low pass filter for 70 MHz by IK0VAQ
[ Hits: 732 | Votes: 3 | Rating: 4.67 ]
A 2 meter band-pass cavity using surplus Heliax - ka7oei
Cavity is often required at a busy site to not only prevent its receiver from ...
[ Hits: 131 | Votes: 2 | Rating: 3 ]
A compact 5 bands remote switchable BPF - ON7EQ
These band filters are based on 3 or 5 sections Butterworth band pass filters maintaining ...
[ Hits: 224 | Votes: 0 | Rating: 0 ]
A diode-switched band-pass filter
High speed silicn diodes work well as RF switches This article describes how to use ...
[ Hits: 2312 | Votes: 3 | Rating: 4.67 ]
A home-built low-pass filter for 4m
This unit uses four capacitors only two of which are variables and a single tapped ...
[ Hits: 589 | Votes: 0 | Rating: 0 ]
A low pass filter circuit
A simple 7 element Chebyshev low pass filter rolls of at 30MHz Attenuation is better ...
[ Hits: 5304 | Votes: 21 | Rating: 6.1 ]
About Cavity Filters
Cavity filters are tipically circuitry behind a duplexer that allow only certain frequencies to pass ...
[ Hits: 472 | Votes: 3 | Rating: 5.33 ]
Audio CW Filter
A very effective AF Adaptor with built in noise blanker and 30 Hz CW filter ...
[ Hits: 1523 | Votes: 3 | Rating: 5.67 ]
Audio CW Filter - g4aon
An home madek Audio CW Filter made simply using SMD Components
[ Hits: 174 | Votes: 0 | Rating: 0 ]
Band Filters
Experience of band filters, for a contest multi operator enviroenment
[ Hits: 4073 | Votes: 6 | Rating: 7.5 ]
Band filters by PA9M
Band filters for PA6Z made by PA9M, designed by W3NQN.
[ Hits: 478 | Votes: 1 | Rating: 9 ]
Band Pass Filters for HF Transceivers - K4VX
If your multiple transceiver station is suffering of intrastation interference this handy and inexpensive band ...
[ Hits: 129 | Votes: 0 | Rating: 0 ]
Band-Pass Filters for HF Transceivers
Do your multiple-transmitter field day or contest efforts suffer from intrastation interference ?
[ Hits: 4350 | Votes: 3 | Rating: 6.33 ]
Band-stop filter
Wikipedia page on Notch filter, a narrow stopband - high Q factor filter
[ Hits: 443 | Votes: 2 | Rating: 2.5 ]
Bandpass and I.F. Filters
On this page a popcorn highpass filter some inductors and their Q double tuned bandpass ...
[ Hits: 902 | Votes: 0 | Rating: 0 ]
Bandpass filter - OZ1CX
A simple project for an effective home made band pass filter designed for the portable ...
[ Hits: 794 | Votes: 2 | Rating: 9 ]
Bandpass filters design
How to design narrowband bandpass filters
[ Hits: 809 | Votes: 4 | Rating: 2 ]
Bandpass Filters for Portable Usage
These are QRP rated 3 Pole Butterworth filters based on a design by K4VX feature ...
[ Hits: 535 | Votes: 0 | Rating: 0 ]
Cheap Crystal Filter
An economical way of building an SSB filter The circuit is for a filter with ...
[ Hits: 497 | Votes: 0 | Rating: 0 ]
Clean Up Your Signals with Band-Pass Filters
These inexpensive easily built filters can be the buffer you need between the signals you ...
[ Hits: 3626 | Votes: 0 | Rating: 0 ]
Clean Up Your Signals with Band-Pass Filters part 2
Part 2 You re now much closer to saying goodbye to your unwanted signal problems ...
[ Hits: 1365 | Votes: 0 | Rating: 0 ]
Coaxial Stub Filters
Coaxial stub filters used at W7GJ
[ Hits: 1136 | Votes: 0 | Rating: 0 ]
Coaxial Stub Filters
A range of easy-to-build RFI filters by John Regnault, G4SWX
[ Hits: 1331 | Votes: 4 | Rating: 9.25 ]
Constant k Lowpass Filter Design
Online Constant - k Lowpass Filter calculator
[ Hits: 451 | Votes: 12 | Rating: 3.67 ]
Contest Bandpass Filters - KG4JJH
Build a set of W3NQN filters for multi-operator contesting
[ Hits: 669 | Votes: 0 | Rating: 0 ]
Curing Alternator Whine - KB1MVX
How to create a low pass filter able to reduce or even remove the noise ...
[ Hits: 517 | Votes: 2 | Rating: 9 ]
CW Notch Filter
Homebrew CW notch filter project by KN9B
[ Hits: 521 | Votes: 0 | Rating: 0 ]
Design RF Filter
[ Hits: 1538 | Votes: 2 | Rating: 4.5 ]
Double Tuned Receiver Band-pass Filter Design Center - VE7BPO
new
This webpage caters to EMRFD owners offering insights into building popcorn receiver band pass filters ...
[ Hits: 23 | Votes: 0 | Rating: 0 ]
Enhancing Frontend Performance with Optimized Band Pass Filters - PA3AKE
This article explores the nuanced design challenges of Band Pass Filters BPF in radio receivers ...
[ Hits: 82 | Votes: 0 | Rating: 0 ]
Filtering of the Icom IC-775 DSP
Replacing filters on ICOM IC 775
[ Hits: 518 | Votes: 5 | Rating: 6.4 ]
Filters and Ferrites in EMC
This article is about the characteristics and use of various filters and ferrites for solving ...
[ Hits: 905 | Votes: 0 | Rating: 0 ]
High Pass Filters
Understand how high pass filters are done
[ Hits: 604 | Votes: 0 | Rating: 0 ]
High-Pass Filter Design
Online high pass filter design page with introduction to high-pass filters by K7MEM
[ Hits: 671 | Votes: 2 | Rating: 1 ]
Highpass filter calculator
Butterworth Highpass Filter Designer
[ Hits: 445 | Votes: 4 | Rating: 2.75 ]
Homebrew a CW Filter
An home brewed morse code CW filter with a central frequency of 800hz and a ...
[ Hits: 1770 | Votes: 2 | Rating: 2.5 ]
Homebrew Crystal Filter Design
Desgining crystal filters and find out crystal data by measuring it.
[ Hits: 687 | Votes: 7 | Rating: 7 ]
How to make a mains filter for EMC and noise reduction - Adrian Leggett
Article showing how I ve made a mains filter to reduce EMC in the electricity ...
[ Hits: 1227 | Votes: 5 | Rating: 9.6 ]
ICOM IC-775 FIlter Installation - PA0Q
Inrad Roofing Filter installation instruction The IC 775 Roofing Filter Mod consists of a 6 ...
[ Hits: 62 | Votes: 0 | Rating: 0 ]
Inrad Roofing Filter in the Yaesu FT-920
Insalling Inrad roofing filter in the FT-920 with pictures and comments
[ Hits: 805 | Votes: 2 | Rating: 9.5 ]
Interdigital bandpass filter designer
Fill out the form to design a bandpass filter as described in the January 1985 ...
[ Hits: 1118 | Votes: 6 | Rating: 7.67 ]
Interferences and filtering
General information on Filter passbands, interferences, TVI and RFI problems
[ Hits: 1171 | Votes: 1 | Rating: 10 ]
K2TR Coax Stub Filters
Multi transmitter filters
[ Hits: 3252 | Votes: 7 | Rating: 6.43 ]
KI5YN QLF Filter
The QLF filter is a microprocessor based interface designed to go between a standard Morse ...
[ Hits: 1944 | Votes: 3 | Rating: 4.67 ]
LC Filter Design
This is an interactive design package for designing analogue i e hardware filters made of ...
[ Hits: 1564 | Votes: 4 | Rating: 6.75 ]
Low Pass Audio Filter
440 Hertz peaked low pass audio filter experiments
[ Hits: 919 | Votes: 1 | Rating: 7 ]
Low Pass Filters
Article explaining electronic network of low pass filters
[ Hits: 817 | Votes: 0 | Rating: 0 ]
Low-Pass Active Filter Designer
Javascript filter design page with introduction to low pass filters by k7mem
[ Hits: 621 | Votes: 1 | Rating: 1 ]
Lowpass filter for 30m - LB0MG
30m lowpass filter for the Softrock Ensemble RXTX tranceiver.
[ Hits: 352 | Votes: 0 | Rating: 0 ]
Mains Filter for EMC & Noise Reduction - M0NWK
This article shows how to make a mains filter that can be extremely effective in ...
[ Hits: 310 | Votes: 3 | Rating: 3.67 ]
Mode J Desense Filter
This type of filter can be used in a Mode J satellite station uplink on ...
[ Hits: 1158 | Votes: 2 | Rating: 5 ]
Narrow Band-Pass filter for HF
Band pass filters can be critical components in competitive stations This setup may help put ...
[ Hits: 2571 | Votes: 1 | Rating: 1 ]
Noise Bridge Tuner Tuner
Noise bridge circuit to tune your tuner
[ Hits: 373 | Votes: 1 | Rating: 10 ]
Notch Filter Designer
Online calculator, Butterworth Bandstop (Notch) Filter Designer
[ Hits: 806 | Votes: 6 | Rating: 3.33 ]
Novel filter for sat working
Elimiate QRM when working with satellite antennas
[ Hits: 480 | Votes: 0 | Rating: 0 ]
Online Microwave Filter Design and Analysis
This site is dedicated to design and analysis of micro and millimeter wave filters from ...
[ Hits: 640 | Votes: 10 | Rating: 6.2 ]
PC Board Filters
Offer performance comparable to tin box filters and except for being bigger stack up pretty ...
[ Hits: 380 | Votes: 0 | Rating: 0 ]
Power netfilter
Homebrew a Power netfilter
[ Hits: 339 | Votes: 0 | Rating: 0 ]
Receiver Band-Pass Filters
Third order Cauer filters can boost performance of multi transmitter multi operator contest stations to ...
[ Hits: 887 | Votes: 1 | Rating: 5 ]
RF filter basics tutorial - radio-electronics.com
an overview introduction or tutorial about the basics of electronics filters including the types of ...
[ Hits: 313 | Votes: 0 | Rating: 0 ]
Roofing Filters
An Introduction to Roofing Filters by ACØC
[ Hits: 520 | Votes: 0 | Rating: 0 ]
RTLSDR Coax Stub - M0NRD
Cutting out the noise using a simple coax filter to improve the poor front end ...
[ Hits: 755 | Votes: 2 | Rating: 5.5 ]
Second-Harmonic-Optimized Low-Pass Filters
Sometimes we need a little more output filtering than traditional designs offer Look at a ...
[ Hits: 881 | Votes: 0 | Rating: 0 ]
SSB and CW Filter
A pdf file with schematics of an ssb and cw filter AF amplifier
[ Hits: 2134 | Votes: 3 | Rating: 4.33 ]
Stub HF filter
Multi transmitter filters for HF Bands
[ Hits: 537 | Votes: 0 | Rating: 0 ]
The Ladder Filter
Article by Lloyd Butler VK5BR
[ Hits: 816 | Votes: 2 | Rating: 8.5 ]
The NVARC Ugly Filter Project
Project to build sets of band pass transmitting filters for reducing the interference between HF ...
[ Hits: 1036 | Votes: 4 | Rating: 9.5 ]
Tunable BandPass Filter - YU1LM
A homemade tunable bandpass filter for all HF bands from 160m to 10m
[ Hits: 1123 | Votes: 3 | Rating: 5.67 ]
Tunekit - Tunekit
Filter Tuning Kit for Windows is a electronic filter synthesis program and a practical filter ...
[ Hits: 4830 | Votes: 10 | Rating: 5.2 ]
TVI Filter schematic
A simple TVI Filter schematic
[ Hits: 415 | Votes: 0 | Rating: 0 ]
Use Band Pass Filters to clean up Signals - W3NQN
Clean Up Your Signals with Band Pass Filters a two parts article published in this ...
[ Hits: 789 | Votes: 1 | Rating: 1 ]
Using Band-Pass Filters
Clean Up Your Signals with Band-Pass Filters
[ Hits: 736 | Votes: 0 | Rating: 0 ]
Using ferrite for interference suppression
Excellent guide to using ferrite cores for interference suppression Understanding and Solving RF Interference and ...
[ Hits: 6168 | Votes: 6 | Rating: 9.5 ]
Variable bandwidth cw filter
As the sunspots return and DX propagation conditions to improve the age old problem with ...
[ Hits: 1151 | Votes: 3 | Rating: 4.33 ]
VHF Broadcast Passband Filter
VHF Broadcast Passband Filter (88 108 MHz) by DF9CY
[ Hits: 599 | Votes: 1 | Rating: 1 ]
W3LPL Receiving Bandpass Filters
Project of receive only filters optimized for minimal loss and very high rejection of frequencies ...
[ Hits: 1086 | Votes: 0 | Rating: 0 ]
W3NQN TX filters - K8GU
Building the W3NQN bandpass filters
[ Hits: 431 | Votes: 0 | Rating: 0 ]
YCCC 6 Band Receive Bandpass filter
This is a 6 band receive only filter designed to protect your receiver front end ...
[ Hits: 1963 | Votes: 2 | Rating: 9.5 ]
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