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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.

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

This unit uses four capacitors, only two of which are variables, and a single tapped coil. It is built in a die-cast box, and has been tested up to 80W input power on 70MHz by G4CJZ

Understand how high pass filters are done

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

VHF Broadcast Passband Filter (88 108 MHz) by DF9CY

Online world map with live updates from the DX Cluster network, displaying new spots on the maps as they appear. Filtering options are available including bands, source continent and dx continent.

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.

Homebrew Amateur Radio 440Mhz Interdigital Bandpass Filter

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

Passive Band-Pass Filter, low-pass filter calculator

Zeus Radio program is designed specifically for the ZS-1 transceiver and supports all the basic functions (RIT, XIT, SPLIT, Noise Reduction, Auto Notch Filter, etc.) in order to work in the broadcast brought only pleasure. Zeus Radio works also with Hermes, Anan, Afedri, Red Pitaya, HiQSDR, Odyssey, Extio, RTL-SDR, Peaberry, Winradio, SDR-IQ, Afedri

Hand made RF sweeper made to adjust the pass band of crystal filter

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

A searchable database of online websdr receivers, lists OpenWebRX, KiWi SDR and WebSDR from all over the world, providing a web interface to search and filter links to websdr

This low pass filter terminates all harmonics from the 2nd to above the 10th harmonic in a better than 15 db return loss load

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.

Manufacturer of professional antenna and filter systems for communications and broadcasting, serving commercial and governmental markets worldwide.

Inrad Roofing Filter installation instruction

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

Homebrew CW notch filter project by KN9B

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

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.

How to create a low pass filter able to reduce or even remove the noise generated from your car or truck alternator

FT1000D 250Hz Filter Modification

Adding a 20m band pass filter for the Icom IC-706MkII(G) by ON7EQ

An economical way of building an SSB filter. The circuit is for a filter with a 6 DB band width of roughly 2.2 KHz.

The Icom IC-7300 is a groundbreaking Software Defined Radio (SDR) transceiver that revolutionizes the way amateur radio operators interact with the spectrum. With its large 4.3-inch color TFT LCD touch screen, users can easily navigate through various functions, including real-time spectrum scope and high-resolution waterfall displays. This allows for quick adjustments and enhanced signal awareness, making it easier to find and engage in QSOs. The touch screen interface provides a modern approach to radio operation, replacing traditional buttons with virtual controls that can be accessed with a simple touch. In addition to its user-friendly interface, the IC-7300 boasts advanced features such as IF-DSP filtering, audio scope functions, and a multi-dial knob that combines tactile control with touch screen flexibility. These capabilities enable operators to visualize signals and make precise adjustments to their settings, ensuring optimal performance during contests or casual operating. The IC-7300 is designed for both beginners and experienced hams, making it a versatile addition to any shack. Its innovative design and functionality truly embody the spirit of modern amateur radio.

A CW sidetone bypass for the NESCAF audio filter, a small and low cost circuit that works great.

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

The New England QRP NESCAF Kit Switched Capacitor Audio Filter by N5ESE

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.

Online Constant - k Lowpass Filter calculator

Butterworth Highpass Filter Designer

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

Building the W3NQN bandpass filters

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

Ham Supply continue to manufacturer the fine Idiom Press electronic keyer, audio filter and other Ham Radio related products

Upload an ADIF fiel and plot all worked grids in an online map. Support filtering by band, year and can export the output directly into a google map, or a google earth KML file

A simple TVI Filter schematic

technics, radio astronomy, great links, duplex filter