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A program to decode morse code (CW) via sound card to text. It can work as narrow-band sound DSP-filter also. No additional hardware is required, you need only receiver and computer with a sound card. It easily integrates with AALog logger. CwGet is a powerful Morse code decoding software for ham radio enthusiasts, featuring a customizable interface with three main windows: spectrum display, oscillogram, and received symbols. It includes auto frequency control, adjustable filters, burst noise rejection, and supports multiple decoding channels. Users can control transceiver frequency via Omni-Rig and record or replay received signals. CwGet also integrates seamlessly with logging software and other applications, allowing data transfer and interaction through DXSOFTEX.DLL. Additional features include manual and automatic threshold adjustments, zoom functionality, and support for various character sets, making it an essential tool for efficient Morse code communication.

Free programmable LOW/HIGH/BANDPASS FIR filter in the audio range 0-4kHz

Dowwnload this free windows programs to design Butterworth, Chebyshev, Elliptic (Caur), Bessel, Legendre and Linear Phase low-pass, high-pass, band-Pass, and band-reject filters. Coupled Resonator band-pass filters

K9AY loop antenna installed at PA6Z Contest group. This is a receiving antennas for the low bands (160m, 80m and 40m). Include schematics and info on a building the control box, preamplifier and low-pass filter

A free computer aided design program to help users without special expertise in filter design to create filters using Linear Technology's monolithic filter ICs. With FilterCAD, you can design lowpass, highpass, bandpass and notch filters

Duplexers for dual band radio are usually high pass filter and low pass filter combined in the same box. This circuit is a design within a cost of US$10.

DX Cluster is an DX Cluster client for Android smartphones DX Cluster supports: Real time DX spots, Different band and mode filters, A country filter for spotter or the spots, Prefix or call sign alarms

Freeware real time DSP filter particularly for applications of amateur radios , IIR, FIR filter, low-pass, high-pass, band-pass filter, band suppressor (notch filter) individually adjustable

Stacking and phasing HF and 6m arrays antenna switches and contesting devices. Custom low band antenna arrays, bandpass filters,commercial/Mil STd filters,microwave components, commercial broadcast filters.

Manufacturer of communications antennas, bandpass filters, RF combiners, receiver multicouplers, diplexers, duplexers, RF connectors, RF circulators, RF isolators, RF couplers and SWR meters

Sharing beverage antennas with this switch boxes is possible. This article describes a 6-position remote antenna switch for Beverage antennas on 3 bands (160m, 80m, 40m). It allows selecting one of 6 antennas for each band without affecting other receivers. The system uses a control box with a rotary switch and a separate splitting box with bandpass filters for each band.

Audio Digital Filter, two bandpass filters, three notch filters, two noise filters graphical setting of filter center frequency and bandwidth Drag vertical lines on top of signal, Microphone input, speaker output Mono, 5 kHz bandwidth

DXFun Web Cluster is a Spanish-based DX Cluster website with chat, propagation reports, solar status, and DX news. Provides special features for registered users like filters, use of tools for calculating dxcc status. Dedicated reporting tools display spots reports with real time graphs that show the most used frequency bands, break by modes, cw ssb or digital modes.

Do your multiple-transmitter field day or contest efforts suffer from intrastation interference ?

This page will describe the construction of a multi band SSB transceiver with all its components Band Pass Filter, Oscillator/Modulator unit, RX/TX Mixer TX Amp I.F. Amplifier AGC VFO Driver amplifier Receive audio amplifier Final amplifier Low pass filter Digital display and VFO stabiliser

TVI and BCI bandpass and bandstop filters in SMD technique. Schematics and images.

Experience of band filters, for a contest multi operator enviroenment

HotPaw MorseDecoder for iPhone and iPad. Translates sounds from mic to text. Includes a DSP narrow band filter.

These inexpensive, easily built filters can be the buffer you need between the signals you want to hear and send and those you don't!

CCUser DX Spot Client is a robust Windows-based Telnet and TNC program for DX cluster systems like CC Cluster, DX Spider, and others. It offers features like multiple Telnet connections, advanced DX spot filtering, bearing/distance display, and integration with LoTW and eQSL. Users benefit from band-specific color coding, missed spot recovery, and detailed DX data, including zones and grid squares. Additional functionalities include chat groups, DX alarms, and WWV data display. It supports logging and contest tools via Telnet, DDE, and RS-232 outputs.

The page provides detailed information on coax stub filters for multi-transmitter setups, including specific lengths for different bands and types of coax. It also references additional technical notes for further analysis.

Kiwa Electronics is a company that specializes in accessory equipment for the radio enthusiast. Our products include Filter Modules to improve receiver performance, a High Performance Medium Wave Air Core Loop Antenna for improved broadcast band reception, the Pocket Loop Antenna, the Earth Monitor, BCB Rejection Filter and Broadband and SW Preamps. We also offer numerous performance upgrades for popular receivers.

RDXCluster is a free windows telnet client for worldwide DX packet Cluster,featuring multiple spot windows, Band/Mode DXCC window, DX History window, Top DX window, Find, highlights, filters the spot by Roberto Verrini

Band-pass filters can be critical components in competitive stations. This setup may help put your station on the map.

High speed silicn diodes work well as RF switches. This article describes how to use diodes for selecting two or more filters ARRL QST article by W1FB

This is a 6 band receive only filter designed to protect your receiver front end and provide 45dB reject at the stop bands. This is a 6-band receive only filter designed to protect your receiver front end and provide 45dB reject at the stop bands. Stop band reject may be limited by the relay isolation. Worse case isolation is at 28 MHz or 35 dB or better. Relay K3/K8 protects the filter during transmit via the PTT line. A 25-50ms delay must be used between transmit and PTT. Do not rely on your radio to provide adequate delay with out using the PTT. You logging software must be set to allow a delay between PTT and time of 1st transmit. This filter will not work with VOX or QSK keying as you will damage the filter.

We produce duplex filters for 6 m, 2 m, 70 cm, and 23 cm band but also for HF bands. Sella and produce products for Ham Radio Repeaters.

A graphics-intensive bandpass filter program based on the helical resonator.

This article presents a technical investigation into spurious emissions from the Yaesu FT-847 transceiver when operating on the 70MHz (4-meter) band. The author discovered significant problems with both factory "UK spec" and modified units. Spectrum analysis revealed that when transmitting at 70.2MHz, the radio produces numerous spurious signals, with the most prominent emission at 45.6MHz measuring only 3dB below the fundamental frequency. The study also documents poor power efficiency on 4m (10.3% at 30W output) compared to 6m operation (23.5% at 30W). Tests verified that jumper configurations had no effect on filter selection. The author warns that using these radios on 4m may violate license conditions due to excessive spurious emissions.

An home-brewed morse code CW filter with a central frequency of 800hz and a variable bandwidth from 230hz to 26hz by F5RDH in french.

The document is a technical guide on designing RF filters for radio frequency applications. It covers topics such as interference suppression, band-pass filters, and low pass filters, with a focus on filter design and circuit filters.

Manufacturer of single band and multiband transceiver bandpass filters for HF. High pass filters, two radoi headphones mix and switch, 6 meter portable antenna, antenna remote switching and steering.

Automaticaly select the correct antenna and bandpass filter, by ON4AOI

Android ham radio DX Cluster, compatible with DX Spider, AR-Cluster, DxNet, CC Cluster, and CLX nodes. NKCCluster supports connecting to a user-defined DX cluster node, filtering DX spots per bands of interest

Part 2 You're now much closer to saying goodbye to your unwanted signal problems!

Free ham radio DX Cluster app for iPhone and iPad based on G7VJR DXlite, allow to easily filter by band, show skimmer or cluster spots, and call-sign search.

UK manufacturer of ham radio accessories, including TNX, SDR receivers, RF Diplexers Triplexers, bandpass filters, iambic memory keyers.

Diplexer is a passive device, a special filter circuit that seperates 2 different bands, not to be confused with the duplexer that usually separate 2 different frequencies on the same band.

General information on Filter passbands, interferences, TVI and RFI problems

The Rock-Mite is a 40m CW kit offered by Small Wonder Labs . It features built-in keyer, direct conversion receiver with a crystal RF bandpass filter, 500 milliwatts of power, and switchable frequency offsets to work around QRM

As the sunspots return and DX propagation conditions to improve, the age old problem with QRM begins to show up on the amateur bands. Thif filter help you on improving reception

A homemade tunable bandpass filter for all HF bands from 160m to 10m

A home made antenna tuner based on the W6JJZ basic concept that ,atches balanced loads without the use of lossy baluns, can provide band-pass filtering and harmonic attenuation.

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

Get live DX spots on your Android device. DX Cluster for android is a real time DX spots client, show different bands and mode filters, a country filter for spotter or the spots, prefix or call sign alarms. Download from Wolphi Solutions

A K9AY loop antenna project done with Far Circuits pc boards for the antenna switch and bandpass filter and preamp by K7SFN

An improved version of DK9NL QRM Killer, with dedicated noise sampling antenna for completely filtering of plasma TV rattle on HF bands

On this page a popcorn highpass filter, some inductors and their Q , double tuned bandpass filters and simple Cohn Crystal ladder IF filters are presented.