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technics, radio astronomy, great links, duplex filter

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

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 modification of the UV3R Baofeng handheld transceiver to improve the built in low pass filter

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

NEScaf: A Switched Capacitive Audio Filter

The mod requires an INRAD 45,705 MHz Crystal Roofing filter and the IC-765 add-in Board

The IC703 features a built-in DSP filter and auto ATU as well as speech processing an a CW keyer with 3 message memories. It is an ideal all-in-one ham station for QRPers.

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

How to build a low-pass filter to remove alternator whine from your car

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

HamAlert let you receive Push,SMS,Email notifications for Cluster,RBN,SOTAwatch spots, with customizable filtering based on many criteria including DXCC, SOTA and WWFF references, CQ zones

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

Microprocessor based interface designed receives a signal from a Morse key, processes it, and re-transmits it to the radio. A microprocessor in the circuit is pre-programmed with a proprietary algorithm which makes a number of measurements and adjustments to the less percise human generated code.

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.

Drake TR-7 A.M. Transmit Filter Modification

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.

A microprocessor based interface designed to go between a standard Morse code key and a radio transmitter. The circuit receives a signal from the key, processes it, and re-transmits it to the radio.

Coax Stubs for filters to help separate stations

Modem Telephone Super Filters For HF and AM Radio Interference.

30m lowpass filter for the Softrock Ensemble RXTX tranceiver.

Filtering of the Sub RX of the Yaesu FT-1000(D)

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

Homebrew a Power netfilter

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.

This article shows how to make a mains filter that can be extremely effective in reducing and in some cases eliminating completely EMC from the electricity supplying your shack

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

Antuino is an accurate instrument that can be used in the field to measure SWR, field strength, modulation, etc. In the lab, it can be used to sweep filters, measure gain, distortion, frequency response, etc. It works upto 150 Mhz. On the third harmonic, it is usable on 435 Mhz band as well (with reduced sensitivity).

TyQSL is a modern Logbook by Hams, for Hams. A Place for other hams to take a look at your QSO statistics as well as search for QSOs in your Logbook that you made public. Just click onto your name in the Menu Bar when you are logged in to get to your public profile. Soma features includes Shows the users Valid Callsigns Look at QSO Statistics, Search Public Logbooks, Filters are avaliable to find QSOs fast Just share the Link on Social Media, QRZ, or Similar with other

Lightning Arrestors, High current filters manufacturer

WiFi Antenna, WiFi Amplifier, RF Splitters, RF FIlters, Adapter, Video Cable and Custom Connectivity Products

Performance RFI Filters that work right at the noise sources, ferrite cores.

Thsi article describes a microcontroller driven semi-automatic antenna tuner capable of handling power levels up to 150 watts. The device is a low pass filter tuner manually tuned by setting the optimized L/C combination by hand and then storing the values into the EEPROM of the mictrocontroller to recall them later (seperately for each band from 80 to 10 meters including WARC bands)

rpitx is a general radio frequency transmitter for Raspberry Pi which doesn't require any other hardware unless filter to avoid intererence. It can handle frequencies from 5 KHz up to 1500 MHz.

How to receive NOAA weather satellite with a home made QFH Antenna. This project includes some easy and efficient notch filters to suppress noise from FM frequencies

Fix VHF TVI problems usign a quarter wave stub filter

A multi tool Windows program that has been designed to offer the EMC RF and Radio Engineer a large variety of tools for Attenuation calculation, VSWR analysis, FIR Filter calculations, EMC system configuration, Radar testing , RF Filter calculation and much more without the need of a live internet connection.

Anatech Electronics manufactures RF filters for communication systems, Military and commercial, as well as RF filters for Wireless applications. Products include, Band pass filters, Duplexers, Low pass, high pass and bandstop filters. Additional products such as RF cable assembly also available.

DC filters from radius power are specifically optimized for applications with DC supply like e.g. photovoltaic inverters. Radius Power provides total power solutions, EMI filters solutions from design to manufacturing, Three Phase, Single Phase, Power Line, IEC inlet, Power entry modules Filters.

Ceramic capacitors, inductor ferrite products, high frequency dielectric components like chip antenna and filters.

This is the official App of the popular DX Web Cluster DXWatch. You can follow amateur radio DX spots trough the world wide DX cluster network filter by band. Available for iPhone and iPad

How to add the YF-122CN 300 Hz CW filter or YAESU XF-119SN 2,3 Khz SSB filter in the Yaesu FT-857

Ini this article the author compare the Icom 756 and Icom IC 756 PRO. Comparison is very detailed and includes S Meter Calibration, Microphone Gain, Transverter Jack, the noise blanked, the spectrum analyzer, audio quality, notch filter, compression meter, noise reduction, sensivity and filter settings along to many other features making this article a must for who want to compare this two models

When operating contest in a multi transceiver environment interferences between the 40m and 20m are guaranteed. An easy and inexpensive way to reduce interferences is to add coax stub filters

Filters and replacement parts for the Drake R-4C receiver by Sherwood Engineering Inc