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Ebook by Akira Matsuzawa Tokyo Institute of Technology, Building blocks in RF system and basic performances, Device characteristics in RF application , Low noise amplifier design, Mixer design and Oscillator design

A danish only scale diagrams designer, usefull to draw front panels and dial scale knobs, windows freeware.

Interesting article on how build your own field day antenna

The design and feeding of driven elements for VHF/UHF Yagi antennas , modeling, observations and some case studies by Graham Daubney F/G8MBI

The information in this article has come from many amateur sources, the most notable was from WA6TEY (sk 1985) Ray Frost, who was a pioneer of VHF Quad designs and one of the best Southern California Transmitter Hunters. Ray built hundreds two meter quads in single and paired configurations as well as his famous mobile radio direction finding quad.

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

manufacture and sell unique, high quality, amateur radio products like HF and VHF antenna mounts

Antenna designs that K5TR have collected from various sources.

ATV 432 MHz AM transmitter schematic

Windows Magnetic Loop antenna design software by DG0KW in Detusch

This is an interactive filter design package, for designing digital filters

Stub sketch notes. Attenuation coax stub schematics

Amateur radio setups for portable and emergency situations.

Design of a 40 meter Vertical antenna

Sunstone.com PCB123 PCB download software. Review Sunstone quality pcb design software. Free PCB software download for all of your business needs.

How to design narrowband bandpass filters

Online calculator, Butterworth Bandstop (Notch) Filter Designer

Around 200 electronic circuits in pdf format or images, There are also over 1000 links to useful electronics, freeware, open source websites. There are some 100 useful documents, software and pcbs too. Mainly industrial electronics, instrumentation. Covers Various aspects of electronics and basics of circuit design.

Taking the Raspberry Pi 2 for a Test Drive with GNU Radio. Installing GNU Radio and receiving aircraft radar with a USB TV tuner

This video will provide a foundation for understanding how power amplifier circuits work. If you are new to High Frequency Power Amplifier Circuit Design, this is the place to start.

Desgining crystal filters and find out crystal data by measuring it.

Online high pass filter design page with introduction to high-pass filters by K7MEM

A nice tutorial and the basics of the software defined radio, SDR, and links of software defined radios to JTRS, and general SDR receiver technology.

Design Guidelines for JFET Audio Preamplifier Circuits By Mike Martell N1HFX

This site is dedicated to design and analysis of micro- and millimeter wave filters from 0.5 to above 100 GHz.

This code practice oscillator project uses a 555 timer IC. Includes a Schematic Diagram of the morse code oscillator

Javascript filter design page with introduction to low pass filters by k7mem

Resources for custom battery chargers and power supplies from powerstream

Design for a quarter wave vertical antenna, for the top band in use at V31YN

Portable, outdoor, trail friendly, low power HAM radio transceivers and kits for sale

Sw tool to design point-to-point multi-hop microwave links and networks, 400MHz to 58 GHz. Site/Hop Configuration; Customized Antenna & Radio Equipment Libraries; Link Budget; Path Profile Analysis ,clearance, reflections; import path profiles from SRTM maps, free download.

If you want to design vertical antennas you can find all theory and formulas used to model a vertical aerial calculating capacitance, reactance, building the inductor and calculating resistances. Includes an excel spreadsheet to calculate efficiency.

Build you own RF probe, measure the level of RF voltage present at a particular point.

DesignSpark PCB is the world's most accessible electronics design software, specially designed for Rapid Prototyping and turning your circuit ideas into testable boards faster. Easy to learn and easy to use, DesignSpark PCB is free and can you can download DesignSpark from this site.

This series will follow to completion the full Low Noise Microwave Amplifier design, development and prototyping.

Redesigning CDE rotator control meter scale for north-centered operation

Antenna design for Horn Antennas

Both Watts and Volt-Amperes are units of measurement for electrical power. Learn what is the difference

Online Constant - k Lowpass Filter calculator

KE7X Elecraft K3 operating manual

EDC is an amateur radio dealer for Heil Sound, Elecraft, Vibroplex and Force 12 antennas in Japan

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

Descriptions, summaries,and tutorials about electronic circuits and electronic circuit design including amplifiers, attenuators, logic, transistor, operational amplifiers and much more

An online multiple calculator of 16 impedance matching networks

Tuned circuits for Progressive Receivers

The collinear antenna, or Marconi-Franklin antenna, is an omnidirectional, high-gain antenna composed of in-phase half-wave dipoles aligned vertically. By using quarter-wave transmission line segments, it maximizes gain at a low horizon angle, outperforming a half-wave dipole. Adding segments increases gain but narrows bandwidth. A popular DIY version, the CoCo antenna, uses half-wave coaxial cable segments connected by non-radiating transmission lines. Built with stable velocity factor cables, a matching quarter-wave sleeve balun, and ferrite rings for attenuation, the antenna achieves performance comparable to commercial models.

Online variometer calculator by IN3OTD

The OCFD Off-Center-Fed Dipole Antenna is an excellent multiband antenna that is relatively simple to construct, yet gets quite decent performance.

Encode/decode On-Off audio pulses for remote control of projects

How to build a complete Single-Sideband amateur radio transceiver from scratch. Article published on hackaday dot com includes an introduction to radio architectures, ssb receivers and tramsitter