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RF parts, filters, rf switching products.

Maker of QRP Kits, QRP CW receiver and transmitters, audio CW Filters, antenna tuners, dummy loads, and morse code practice oscillator

Yaesu FT-2000 roofing filters

Filters and performance upgrades for many receivers

Cooling kits, drake filters, speach processors, audio switch boxes, synchronous AM detectors,

Coaxial stub filters used at W7GJ

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

Project of receive only filters optimized for minimal loss and very high rejection of frequencies below 75% of the filter center frequency by K1TTT

Project to build sets of band pass transmitting filters for reducing the interference between HF transceivers operated in close proximity

High pass filter schematics for TVI and examples of finished filters

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

International crystal manufacturing provides quartz crystals, oscillators, precision crystals, filters, tcxos / vctcxos, qcm crystals, and other frequency control products. read details about our crystals and frequency control products and services.

This article is about the characteristics and use of various filters and ferrites for solving amateur radio electromagnetic compatibility problems involving breakthrough of amateur signals into domestic equipment such as television sets, video recorders stereo sytems etc.

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

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

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

Article explaining electronic network of low pass filters

How to design narrowband bandpass filters

Filters, Duplexers, Combiners Bi-Directional Amps

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.

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

Clean Up Your Signals with Band-Pass Filters

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.

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.

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

Passive Band-Pass Filter, low-pass filter calculator

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

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.

Replacing filters on ICOM IC 775

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

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.