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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

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

CW and SSB INRAD narrow filters modification

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

Band pass filters, for radio frequency interference problems.

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

Understand how high pass filters are done

HF Radio Preselectors,BCB filters,Low Pass filters,Band Pass filter

Manufacturer of transformers, inductors coils and chokes. Custom winding, EMI / RFI Filters, Antenna Windings on ferrite rod, Antenna Winding on phenolic. Any antenna coil designs.

A numerical optimizer (solver) for LTSpice IV. Uses a fast evolutionary algorithm. You can use EvoSpice to design high efficiency power supplies, audio filters, low noise RF amplifiers and an endless list of other applications

Broadband instruments, R and microwave components and filters, field analyzers, spectrum analyzers

Amplifiers, filters, attenuators, mixers, PLL, switches and frequency dividers, signal generators, power detectors, transimpedance amplifiers, variable gain amplifiers and more

A Short Guide to Harmonic Filters for QRP Transmitter Output. - George Dobbs G3RJV

Passive Band-Pass Filter, low-pass filter calculator

These are QRP rated 3 Pole Butterworth filters based on a design by K4VX, feature simplicity, almost no insertion loss, and reasonable rejection on the other ham bands.

Multi transmitter filters for HF Bands

An Introduction to Roofing Filters by ACØC

R3KBO is an amateur radio club producing and developing amateur radio kits and assembled products including HF VHF Power Amplifiers or RF Power Kits and amplifier parts, low pass filfers, band pass filters, sourge protections, splitters and combiners, antenna switches

Replacing filters on ICOM IC 775

The program can be used to calculate inductors (coils) and their number of turns on ferrite cores, ferrite shells and air coils. These can be used for baluns, Ununs, bandpass filters, low pass filters, resonant circuits, and more. The technical specifications of the cores are already integrated in the program. Application is free and runs on Windows 32 bit versions only. To make it run on Windows 10 64 bit need to be unzipped in a single folder.

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

Cobham Microwave has a long term experience in Microwave Systems and Components. Their five areas of capabilities are Systems and Components: Diodes & Modules, Ferrite Devices, RF Filters, and Waveguides.

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

Homemade LC Bandpass Filters for 20M, 30M, 40M In multi-station environments like special events, field day, portable operating, is very important to protect receivers from excessively strong signals. Bandpass filters help to protect your transceivers.

Intersting article about TV interference, with several examples of TVI Filters, to reduce the passage of any RF above the 30 MHz including commercial Low Pass Filters, home made notch filters or coaxial filters.

Yaesu FT-950 and FT-2000 Roofing Filter Optimization and Improvement Project

If you needed the ability to quickly measure RF voltage for tuning filters and cavities this RF Probe probe is for you

Building the W3NQN bandpass filters

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

Summary Instructions for Installing the AC0C Roofing Filter by NS into the Yaesu FT-950

Couplings Designer for iPhone. Modern advanced filter synthesis using coupling matrix techniques. There's a free LITE version limited to 4th order filters.

Martek Power designs and manufactures a wide of high performance power supplies for various industries. Power supplies AC-DC, DC-AC inverters, DC-DC, EMI Filters

A forum thread on installing filters on Icom IC 706 MkII Model G with pictures, instructions and video

Yaesu FT-950 and FT-2000 Roofing Filter Optimization and Improvement

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.

The TVI filters described in this page worked very well in curing a TVI problem on 2m abd 70cm

Producers of custom name tags, luggage tags, club badges, Employee Name Tags, Special Event Badges, but also Comtech Amateur Radio Television Transmitters and Receivers D480 filters, Video cameras and accessories.

Examples of absorbtive low-pass filters in which the unwanted high-frequency energy is separated from the wanted output and then dissipated in matched resistors

How to limit unwanted harmonics from your raspberry Pi radio transmitter by introducing filters.

Coax Stubs for filters to help separate stations

Modem Telephone Super Filters For HF and AM Radio Interference.

Custom EMI Filters, AC DC Three phase filters by Filter Concepts Inc.

Realization of confortable communications. RF Filters

Icom 706MkIIG Filters, Make a narrow CW filter work in SSB for the digital modes

A complete guide on using the HF amateur radio bands, and the differences with VHF, using filters, influence of solar weather, the split mode and phonetic alphabets.

an overview, introduction or tutorial about the basics of electronics filters including the types of filter and the various filter design considerations and parameters