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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

Drake R-4C, Filter Leakage Problem by SM7EQL

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

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.

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

Filtering, modifications and improvements of the Yaesu FT-1000D

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

Passive Band-Pass Filter, low-pass filter calculator

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.

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

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

Multi transmitter filters for HF Bands

Inrad Roofing Filter installation instruction

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

Homebrew CW notch filter project by KN9B

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

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

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.

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.

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.

Elimiate QRM when working with satellite antennas

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

Build this circuit to tailor your microphone response to different band conditions. A project by KG4JJH

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.

Online Constant - k Lowpass Filter calculator

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

Butterworth Highpass Filter Designer

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

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

A simple TVI Filter schematic