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Third-order Cauer filters can boost performance of multi-transmitter, multi-operator contest stations to the next level. The filters are practical and you don’t need expensive test equipment to align them.

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

Tips on winding wire coils used as inductive loads, traps, band-pass filters, are implemented in a number of amateur radio projects especially antenna projects

Notes about generating RF sweep signals on the Arduino for filter testing, a digital version of the old Wobbulator concept

A Simple unit which can be used to plot the Response of IF Filters and IF Channels

Australia's largest range of Electronic Kits & Components In Stock for the Radio Experimenter, ATV, microwaves, HF Band pass filters

comprehensive line of products for rejection of Radio Frequency Interference (RFI) to telephone equipment.

Step by Step - Installing the NS Roofing Filter into the FT-2000

A simple project for an effective home made band pass filter, designed for the portable field day usage

Supplying Toroids, Electronic Parts and Kits to Engineers, Schools and Hobbyists. Capacitos, filters, inductors, qrp products

Article explaining electronic network of low pass filters

Article by Lloyd Butler VK5BR

ATV Filters, RF filters dealer

How to design narrowband bandpass filters

Communication Coil, Inc. designs and produces custom, high reliability Filter Networks, RF Coils, Chokes, Inductors, Baluns, Toroids and Power Magnetics for communications

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

Online calculator, Butterworth Bandstop (Notch) Filter Designer

Clean Up Your Signals with Band-Pass Filters, a two-parts article published in this PDF file from a June 1998 QST article

Filters, Duplexers, Combiners Bi-Directional Amps

This sweeper built for a narrow bandwidth filter adjustment, use a simple 555 version sawtooth wave generator.

Products and books for the radio hobbist. Antennas, Coax cables, filters,Lightning Protection, Wire & Cable, Books

ScopeIIR: an Infinite Impulse Response (IIR) digital filter design tool for Windows. It designs high-order IIR filters based on analog filter prototypes, and can design lowpass, highpass, bandpass, and bandstop filters.

MPfilters is a Windows-based program which enables you to select the Yaesu FT-1000MP and FT-1000MP Mark V main receiver and sub receiver IF filters via the radio’s CAT port

The direct conversion receiver described consists of only a bandpass filter, mixer IC, VFO and audio filter. With only 22 parts, this simple circuit should take a few hours at the weekend to construct.

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

Maker of filters, oscillators, cristals Coils, Toroidal Inductions, Solenoids, Bifilar wound Solenoids, Trifilar Solenoids and Transformers Located in Kansas City, Missouri

Ham rasio shop in Chzeck republic, offer antennas, filters, roators, electronic components, cw keyers, power supplies, and other ham shack accessories

Provide service, quality home construction projects, travel antennas, masts and bases, hf and vhf amplifiers, low pass filters and z-match tuners

A High pass filter will not help, use a stop-band filter to notch out the beast.

Clean Up Your Signals with Band-Pass Filters

An home made low pass filter for 70 MHz by IK0VAQ

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

Radio Filters manufactures low price fm notch filters.

HF receiving systems and components, band pass filters, array controllers, HI-Z pre amplifiers

Will additional coax stubs improve Band Pass Filter performance?

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

Build a set of W3NQN filters for multi-operator contesting

An illustrated modification for the Icom IC-R20 receiver to locate and use the unfiltered audio.

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

Unfilter LF output from the TH215/415 kenwood portable radio

CW and SSB INRAD narrow filters modification

Last 15 minute Reverse Beacon Network spots on live graph, let you filter by dx spot continent or spotter continent, as well as by band and let you reduce bandwidth

This site is dedicated to design and analysis of micro- and millimeter wave filters from 0.5 to above 100 GHz.

Filters for the commercial 2 way market, MATV, FM broadcast, laboratory, marine industry, amateur radio, scanner and short wave. Antenna for amateur radio bands

SOTA Spotter is an application written for devices running Android™ versions 4.0.3 and above (like smartphones and tablets). It can send spots, filter and trigger notifications for incoming spots.

Band pass filters, for radio frequency interference problems.

DX cluster monitoring tool. Filter DX spots from packet radio cluster. Download windows freeware

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

How to setup and install custom filters, usually inrad, into Yaesu FT 857 and FT 897 transceivers

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