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Amplifier, vacuum tube, receiving beverage loop vertical and transmitting antenna system technical information radiation resistance, EH antenna, noise,receivers, and information on keyclicks.

This is the antenna w3ff designed for his walking portable station. It is a dipole constructed out of the plastic plumbing pipe CPVC. There are telescoping whips at the ends of each side of the dipole, and these whips are adjusted to bring the antenna into resonance on each of five HF Bands 10, 12, 15, 17, and 20 Meters

Two well performing 50 MHz antennas designed with W7EL EZNEC along to many other antenna projects and related articles

The Beverage antenna was invented in the early 1920s by Dr. Harold H. Beverage

The manuals in this archive are available to all who enjoy working on and restoring old tube type amateur radio equipment and short wave receivers. Hundreds of boatanchor manuals

2 elements short boom yagi for 80 meters

Automatic Position Reporting System windows program, allow monitoring of real time geographical information such as the position of vehicles, the status of weather, radio direction finding and more.

A very beginner's guide to coax cables. Characteristics, detailed comparison of typical coaxial cables, commonly used connectors, and a few words about SWR.

EH antenna for six meters band by IW0BZD

NGC is now distributor for COMET and MALDOL brand antenna products designed, manufactured in Japan. Distributor of DAIWA brand RF SWR/power meters and switching power supplies, antennas, test equipment, antenna analyzers and more

A new, revolutionary design allows the construction of small HF antennas, which provide the same efficiency as large antennas. This antenna can be built for all HF bands, from 10 to 80 m.

Based on HB9CV, F6ITV decribes how build a swiss quand antenna for 28 and 50 Mhz.

Pictures comments and detail on a 2 elements antenna for 2 meters band

Oscilloscope, Realtime spectrum analyzer, Impedance meter, RLC bridge and signal generator for Windows. Is a Windows application that converts your PC into a powerful dual-trace signal analyzer (oscilloscope, FFT etc...) . Uses your PC sound card as an Analog-to-Digital a Converter to digitize any input waveform and as Digital-to-analog Converter for the signal generator. True 24 bit adc/dac 48K/96k/192k sampes/sec.

Radio frequency allocations

The Yaesu FT-857 has a number of undocumented features some of which are very interesting.

Homebrew VHF Yagi 50MHz 144MHz 432MHz 1296MHz 2320MHz 6M 2M 70CM 23CM 13CM Yagis

End-Fed antennas are NOT balanced systems; but neither are verticals, ground planes, discones, windoms, zepps, Marconis, half-slopers, et al. Additionally, the low-impedance antenna port of your transmitter/receiver is not balanced.

A 20 ampere and more 13,8V power supply for RTX

Low weight Titanium Verticals, Log-Periodics, Yagi antennas, Quads, towers and antenna accessories by Titanex

Detailed plans of my homebrew receiver. Frequency coverage is from below 300kHz to 30MHz. Pictures, schematics, board layouts, parts lists and more can be found here.

Graphic viewer for shortwave broadcasting and programming schedules. Supports viewing schedules in an expanding table and on a 24-hour Gantt chart using the local time and the UTC time display modes. Runs on multiple platforms.

Setting up the Arduino DUE to run as an SDR software defined radio

Here is a 70cm (440 Mhz) J-Pole antenna that is inexpensive, and easy to build. Author use 1/2 inch copper pipe, and the associated fittings necessary. The dimensions aren't typical however, this is what it took to get its SWR low.

Over 25,000 amplifiers and sub-assemblies were produced by Angle Linear for the communications industry over a 40-year period. The company specialized in **high-linearity RF products**, focusing on preamplifiers, bandpass filters, and receiver multicouplers. Specific product lines included PHEMT and GaAs FET preamplifiers, offering both quadrature and single-ended configurations for various signal levels. The offerings encompassed coaxial and combline bandpass filters, along with integrated filter-preamplifier assemblies. The company also provided custom RF assemblies, addressing applications such as MRI preamplifiers, passive radar, and EME (moon bounce). Their product range covered VHF and UHF frequencies, including specific designs for 2m, 70cm, and 23cm bands, often featuring high IP3 performance. Technical documentation, such as filtering application notes and duplexer theory, was also associated with their product offerings.

Cybercorder 2000 was a versatile audio recording software that allowed users to capture audio from various sources, including radios and internet streams. It functioned similarly to a VCR, enabling users to schedule recordings and save them in WAV or MP3 formats on their PC. Although the software is no longer sold or supported, it provided a range of features that made audio recording easy and efficient. Users could listen to audio being captured in real-time and utilize a built-in sound editor for editing recordings. As Cybercorder 2000 has been retired, users are encouraged to consider Total Recorder Professional Edition as a suitable replacement. Total Recorder offers enhanced features such as scheduled recordings, background recording, and the ability to convert and edit sound files. With its user-friendly interface and robust functionality, Total Recorder remains a popular choice for those looking to record audio from various sources, making it a valuable tool for amateur radio enthusiasts and audio recording professionals alike.

Roy G4WPW has collected one of the most complete and interesting pages for microphone connections schemas and wiring. Includes Kenwood microphones schematics as well as Yaesu Icom Alinco Adonis Drake Heil JRC MFJ schematics

Build your own multiband W3DZZ antenna resonating on 80 40 20 15 and 10 meters band

This Vertical antenna design by David Reid for lower bands focuses on achieving effective DX communication by optimizing the antenna low-angle radiation for long-distance contacts. The design incorporates techniques like linear loading and capacity hats to reduce the antenna's height while maintaining performance, especially on 40m and 80m bands. Building a solid ground plane and using quality materials ensure efficiency and durability. Although vertical antennas can be complex to build, this project simplifies the process, making it accessible for ham operators seeking strong, reliable signals.

Amateur Radio Control System for the Kenwood TS-2000 by WB5KIA

Total Boom Lenght is 3 m.

Here's an award-winning, easy-to-homebrew, multi-band portable vertical antenna designed by long-time antenna aficionado James Bennett, KA5DVS. He documented the design and construction plans for a portable antenna that can be built with relatively ordinary components

Installing your dipole end insulators, a beginner guide to proper setup wires to insultaors.

Calculate eh antenna components dimension with this online form

J-pole Design Program V1.1 by WA2ISE Download a VHF twinlead Jpole antenna calculator MSDOS program

Scanner and radio mods taken from qrz ham radio cd rom

A well documented plan to build a magnetic loop antenna for Shortwave Listening, includes photos and diagrams.

Freeware windows Wave Generator use the sound card's output as sine wave output. A built in sweep algorithm is used by audio hackers to measure frequency repsonses of their amplifiers

This page details the construction of an easy-to-make collinear 360 degrees omni-directional, vertically polarised, antenna for 802.11b/g wireless networking.

Practical contruction and designing notes of a delta loop for the 40 meters band

MININEC for Windows 14 is antenna modeling tool for the novice, student and hobbyist. Download the mininec setup files.

A G5RV plan for 10-160 meters, 10-40 and 10-80 meters band

How High should my Dipole be? Dipole Antennas and the effect of height above ground. The effectiveness of a dipole antenna is influenced by its height above ground, determined by the intended use such as DX work, local communication, directionality, omni-directionality, and feed point impedance. Through EZNEC modeling, the study evaluates a 40-meter dipole's performance at various heights, from 7 to 560 feet. Findings reveal that lower heights enhance omni-directional local communication, while higher placements favor DX work with low-angle radiation. The study emphasizes the importance of defining operational goals to optimize dipole height and performance.

FFTDSP is a PC program which can detect weak radio signals in real time. Uses the PC's soundcard and advanced signal processing techniques, extracts and displays weak signals from the receiver audio.

90 foot tall top loaded vertical for 160 meters

Live streaming audio of VHF marine radio channels 05A, 16, and 22A from NJ and NY City

PC sound card interfacing for RTTY SSTV PSK31, collection of interface connections to choose from when having a desire to use the Soundboard

Winrad is a free software program designed to implement a Software Defined Radio (SDR), meant to run under Windows XP, Windows 2000, or Windows 98SE. In a nutshell, it accepts a chunk of up to 96 kHz coming from a complex mixer in form of two signals, I and Q, fed to the PC sound card.

Amateur and commercial towers

RadioRaft decodes 10 different ARQ modes, 8 different FEC modes, Packet, Baudot, CW... It works with a Hamcomm interface or a radiomodem. RadioRaft offers automatic detection of modes, speeds and shift. It comes with a frequencymeter/baudmeter included, it has signal frequency tracking and a bit by bit display mode. Very easy to use. practical and fast.