RF Filter

This is an interactive filter design package, for designing digital filters

A combined 144MHz Low-Pass and 432 MHz Notch Filter by VE2ZAZ

Homemade LC Bandpass Filters for 20M 30M 40M In multi station environments like special events ...

2 filter designs a 3-pole and a 5-pole

A homemade band pass filter for the 30 meter band based on the original VE7BPO ...

Combined 432 MHz High-Pass - 144 MHz Notch Filter By Bertrand Zauhar, VE2ZAZ

Homebrew Amateur Radio 440Mhz Interdigital Bandpass Filter

This low pass filter terminates all harmonics from the 2nd to above the 10th harmonic ...

Sometimes many VHF UHF modern transceivers have problems with BROADCAST Interference and CROSS modulation from ...

An home made low pass filter for 70 MHz by IK0VAQ

Cavity is often required at a busy site to not only prevent its receiver from ...

These band filters are based on 3 or 5 sections Butterworth band pass filters maintaining ...

High speed silicn diodes work well as RF switches This article describes how to use ...

This unit uses four capacitors only two of which are variables and a single tapped ...

A simple 7 element Chebyshev low pass filter rolls of at 30MHz Attenuation is better ...

Cavity filters are tipically circuitry behind a duplexer that allow only certain frequencies to pass ...

A very effective AF Adaptor with built in noise blanker and 30 Hz CW filter ...

An home madek Audio CW Filter made simply using SMD Components

Experience of band filters, for a contest multi operator enviroenment

Band filters for PA6Z made by PA9M, designed by W3NQN.

If your multiple transceiver station is suffering of intrastation interference this handy and inexpensive band ...

Do your multiple-transmitter field day or contest efforts suffer from intrastation interference ?

Wikipedia page on Notch filter, a narrow stopband - high Q factor filter

On this page a popcorn highpass filter some inductors and their Q double tuned bandpass ...

A simple project for an effective home made band pass filter designed for the portable ...

How to design narrowband bandpass filters

These are QRP rated 3 Pole Butterworth filters based on a design by K4VX feature ...

This project involved designing a 7 pole Chebychev broadcast band filter to address severe interference ...

This project documents the construction of a coaxial 50 MHz notch filter to eliminate inter ...

An economical way of building an SSB filter The circuit is for a filter with ...

These inexpensive easily built filters can be the buffer you need between the signals you ...

Part 2 You re now much closer to saying goodbye to your unwanted signal problems ...

Coaxial stub filters used at W7GJ

A range of easy-to-build RFI filters by John Regnault, G4SWX

Online Constant - k Lowpass Filter calculator

Build a set of W3NQN filters for multi-operator contesting

How to create a low pass filter able to reduce or even remove the noise ...

Homebrew CW notch filter project by KN9B

This webpage caters to EMRFD owners offering insights into building popcorn receiver band pass filters ...

This PDF article introduces a series of dual tuned bandpass filters designed for input tuning ...

This article explores the nuanced design challenges of Band Pass Filters BPF in radio receivers ...

Replacing filters on ICOM IC 775

This article is about the characteristics and use of various filters and ferrites for solving ...

Understand how high pass filters are done

Online high pass filter design page with introduction to high-pass filters by K7MEM

Butterworth Highpass Filter Designer

An home brewed morse code CW filter with a central frequency of 800hz and a ...

Desgining crystal filters and find out crystal data by measuring it.

Article showing how I ve made a mains filter to reduce EMC in the electricity ...

Inrad Roofing Filter installation instruction The IC 775 Roofing Filter Mod consists of a 6 ...

Insalling Inrad roofing filter in the FT-920 with pictures and comments

Fill out the form to design a bandpass filter as described in the January 1985 ...

General information on Filter passbands, interferences, TVI and RFI problems

Multi transmitter filters

The QLF filter is a microprocessor based interface designed to go between a standard Morse ...

This is an interactive design package for designing analogue i e hardware filters made of ...

440 Hertz peaked low pass audio filter experiments

Article explaining electronic network of low pass filters

Javascript filter design page with introduction to low pass filters by k7mem

30m lowpass filter for the Softrock Ensemble RXTX tranceiver.

This article shows how to make a mains filter that can be extremely effective in ...

This type of filter can be used in a Mode J satellite station uplink on ...

Band pass filters can be critical components in competitive stations This setup may help put ...

Noise bridge circuit to tune your tuner

Online calculator, Butterworth Bandstop (Notch) Filter Designer

Elimiate QRM when working with satellite antennas

This site is dedicated to design and analysis of micro and millimeter wave filters from ...

Offer performance comparable to tin box filters and except for being bigger stack up pretty ...

Homebrew a Power netfilter

Third order Cauer filters can boost performance of multi transmitter multi operator contest stations to ...

an overview introduction or tutorial about the basics of electronics filters including the types of ...

An Introduction to Roofing Filters by ACØC

Cutting out the noise using a simple coax filter to improve the poor front end ...

Sometimes we need a little more output filtering than traditional designs offer Look at a ...

A pdf file with schematics of an ssb and cw filter AF amplifier

Multi transmitter filters for HF Bands

Article by Lloyd Butler VK5BR

Project to build sets of band pass transmitting filters for reducing the interference between HF ...

A homemade tunable bandpass filter for all HF bands from 160m to 10m

Filter Tuning Kit for Windows is a electronic filter synthesis program and a practical filter ...

A simple TVI Filter schematic

Clean Up Your Signals with Band Pass Filters a two parts article published in this ...

Clean Up Your Signals with Band-Pass Filters

Excellent guide to using ferrite cores for interference suppression Understanding and Solving RF Interference and ...

As the sunspots return and DX propagation conditions to improve the age old problem with ...

VHF Broadcast Passband Filter (88 108 MHz) by DF9CY

Project of receive only filters optimized for minimal loss and very high rejection of frequencies ...

Building the W3NQN bandpass filters

The FF 501DX LPF a high performance VHF and 10m filter was obtained at a ...

This is a 6 band receive only filter designed to protect your receiver front end ...