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Zelscope is a Windows software that converts your PC into a dual-trace storage oscilloscope and spectrum analyzer. It uses your computer's sound card as analog-to-digital converter, presenting a real-time waveform or spectrum of the signal - which can be music, speech, or output from an electronic circuit.

Circuit diagrams, CB and HAM mods, alignments, data sheets and pinouts, a massive site with over 600 pages of free info

Circuits of SSB Transceiver, AM DSB Transmitter, Antennas, BFO, VFO, 807, FM Mike, Crystal filter and more.

Circuit diagram and discription of 7 MHz Ham Radio SSB Transceiver. Transceiver using two MC1496, 4.43 MHz Ladder filter, LM386, LM324 and IRF840 in final.

Program for amateur radio digital communications via a sound card. Supported modes are RTTY (Baudot code), ASCII (7 or 8 bits), PSK31 (BPSK and QPSK) and AMTOR-FEC (SITOR-B, NAVTEX). SELFEC SITOR decoding is possible also. No additional hardware required, need only a sound card. Optionally you can use simple circuit fo PTT-control. Can cooperate with RZ4AG AAlog logger.

Specializes in antique radio schematics, circuit diagrams and service data for vintage tube radios. Carries information for American, Canadian and European antique radios.

Short dipole antenna for 40 meter ham band. Can be put up in the space required for a 20 meter dipole.

Interesting project to remotely control, using a servo control circuit, a common commercial antenna tuner by N30X

This page describes the design and construction materials W8WWV used to build a coaxial cable trap. A coaxial cable trap is a parallel resonant circuit that is usually inserted in an antenna element to enable multiband operation.

Complete 144/50 MHz transverter with GaAs Fet LNA and 400 mW out. No printed circuit board. Schematics and images by Christoph Petermann DF9CY

432 MHz EME low noise amplifier. Circuit, components and image by Christoph Petermann DF9CY

This web page describes a small, single tuned circuit regenerative receiver primarily for daylight reception in the 16, 19, 22 and 25 meter international shortwave broadcast bands.

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.

This project details three variants of a vertical half-wave antenna design for the 4-meter (70MHz) amateur radio band. The antennas use end-feeding with a parallel-tuned circuit for impedance matching to 50-ohm coaxial cable. The first variant uses suspended flexible wire for portable use, the second employs a fiberglass rod with internal wire for permanent outdoor installation, and the third utilizes aluminum tent poles for quick mobile deployment. Despite the narrow bandwidth of the matching circuit, this suits the narrow 4m FM allocation well. The design offers an effective omnidirectional radiation pattern and can be constructed with readily available materials.

TCUBE is a combination of a Spectrum Analyzer and a Two Tone Generator, with optional quadrature outputs. It can be used for measuring the intermodulation behavior of an audio circuit, and as a general purpose tool

This transverter was built in 1994, a discription in three parts (german language) for DOWNLOAD as PDF-files. Circuit, printed-boards and layouts in the files

based on the famous Curtis family of morse keyer chips and has a proven record of dependability.

"Digital voice processor for amateur radio operators. It use prepared ""wav""-files for transmition. Can work in the beacon mode. Optionally you can use simple circuit for PTT-control. It has a lot macros for tramsmitting. Can cooperate with RZ4AG AALog logger."

Here is a circuit that will resonate a short whip antenna for the HF Bands.

Ham Radio Antenna Tuners--Full Legal Power--Patented Circuit--Outstanding Efficiency and Power Capability

A simple keyer which can be built for as little as $6 with some junk box parts. Although this circuit is not a true iambic keyer, it is capable of producing perfectly sounding CW.

by Mike Martell N1HFX

These devices are called Traps, but they are actually more like frequency sensitive switches. They are parallel resonant, high Q, tuned circuits which provide a very high impedance at their frequency of resonance.

A lot of good informations concerning antennas, filters, moonbounce, and circuitry data.

PDF resources containing information on low cost ssb,am,cw circuits, which are useful for beginners.

When one operates at low power on SSB, speech processing becomes almost essential to get through the QRM. The circuit is a low cost speech processor that will perform well with a minimum of construction effort.

Circuit and software to build a beacon keyer, includes downloadable packages.

Inline RF Power & VSWR Meter. A DIY meter 0 to 30 Watt with Average and Peak. Circuit Description, Arduino Nano software code and part list to DIY your own Digital SWR Meter

Easy circuit that provide good gain to weak audio signals

Free Russian hamradio server special for radiofanats from CIS. Search engine on callsigns, electronic circuits and hamradio programs in www powered with knowledge base.

Iambic keyer with simple paddles and simple electronic circuit.

The Emtech ZM-2 Antenna Tuner is a nifty little portable transmatch for QRP (low power). It utilizes the well-known Z-match circuit, which is especially useful for balanced antennas (like dipoles and loops).

The Radio Component Database offers a structured collection of technical documentation for various radio components, primarily focusing on those relevant to CB-Radio and general transmitter/receiver equipment. It categorizes components such as RF Bipolar Small Signal Transistors, RF FET Small Signal Transistors, RF Power Transistors, and Integrated Circuits, providing specific data for each type. The resource includes a "Shortform Transistor Catalogue" and a section dedicated to Variable Capacitance Diodes, detailing their characteristics and applications. A significant feature is the inclusion of cross-reference databases from major manufacturers like NTE Electronics Inc., ECG, Fujitsu, Motorola RF-Components, and Philips Components, which can be invaluable for component substitution or identification. Users can access specific technical data from manufacturers such as National Semiconductor, NEC Semiconductor, and Toshiba Components, with some data available in _PDF_ format. The database serves as a reference for hams and technicians working with RF circuitry, offering a centralized location for component specifications and alternatives, which can save considerable time during design or repair work.

Pictures and circuit diagramm to build this power amplifier for 2 meters

Electronic circuit and components layout fot this VHF Preamp

This article reviews the proposition that a 4:1 current balun in the style of Guanella can be constructed with both pairs of windings sharing a common magnetic circuit.

Remote Control Antenna Switch made with two circuits board

Here is how to adjust this popular tuner circuit so it transfers maximum power to your antenna without going snap

Provide components to the amateur who wants to construct their own gear and to the professional who wants to save money and time in prototyping their circuit design, Filters, HF Amplifiers, Splitter Combiners, VHF Amplifiers, ATV

Morse Tutor is a DOS based program written in C++. It can be used to practice morse code. Various options are available. Morse tutor with Complete Source Code and Binary is available for Download (32KB).

An external keypad for FT-817(ND), for the serious portable/field-day contester/operator. Homebrew it with the free firmware and public circuit diagram. The circuit is very simple and takes power supply from the ACC port of the radio

Need a variable power supply that is short circuit protected and over voltage protected; Here is a good one that can be built cheap by VE3IVJ

Circuit of the Kenwood IF-10D interface for the TS-50 transceiver.

Circuits, pictures and data about toroids, tubes and home made power amplifiers

Free PCB software is a snap to learn and use. For the first time, designing circuit boards is simple for the beginner and efficient for the professional.

Circuit diagrams to homebrew different baluns by vk2awx

A circuit that connects an IBM compatible personal computer, running TR Log or CT (etc.) contest logging software, and Kenwood transceivers equipped with serial control ports. CW keying is also provided in this RFI filtered interface unit.

This circuit provides an interface between the Yaesu 920 transceiver and IBM computer sound card which allows data transfer and control of PSK31, RTTY, KEYBOARD CW, and SSTV modes for Amateur Radio

This simple circuit is intended for older Kenwood radios and was presented in chapter 22 of the ARRL Handbook.

Specializes in antique radio schematics and capacitors. carries antique radio schematic diagrams and electronic circuit service information for american, canadian and european antique radios.