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To save a little time from calculating and experime nting when winding toroid cores here a chart of the most commonly used cores

Palm interface for the FT100D by Andre, HB9FBD

Premium quality, full color, custom QSL cards produced in America's Heartland, competetive rates. Produced by Hams for Hams!

The Old Tube Radio Network is dedicated to those real, American-Made, Old Tube CB Radios

A small antenna for limited space / lanai use.

VFO Stabilizer for Kenwood 120, 520, 820, 530, 830 Yaesu FT-101, 901,2 TenTec 580, 540, Triton, Corsair, Omni series, Swan 350, 500cx, Collins KWM 2 and 2A, Drake TR4, T4, R4, Heathkit HW101, SB 104a....and many others

This article documents the modification of 2 types of Hewlett Packard switching power supplies to enable their use as power sources for ham radio equipment

How to Operate Ham Radio on a Linux Workstation

A dipole for 2m, 4m, 6m band an hamdwritten note for a homemade vhf antenna that can be tuned across the VHF band

German antenna manufacturer for VHF UHF antennas, Quad-antennas, yagi-Antenna, LPDA-Antenna, W-Lan Antennas.

List of north america beacons transmitting on vhf and uhf bands compiled by WZ1V

news and views from the UK about the course of CB in the U.K. and Europe.

Description of the 80m antenna used at CN2WW in the ARRL-DX CW 2007

A quick and simple reference to various communications signals, such 10/11 Codes, Morse Code, Phonetic Alphabet, Police Color/Penal Codes, Q-Signals.

Solutions to attach antennas to TH-D7 radio using a SMA to BNC adapter that can be used with any Kenwood hand-held radio shipped with SMA connectors.

ARRL Laboratory Expanded Test-Result Report ICOM IC-746 Pro

This program demodulates the telemetry data signal transmitted by the AO-40 satellite (aka Phase III-D) using the PC sound card

Presents a dynamic, searchable database of shortwave broadcast schedules from around the world, enabling users to locate active stations or plan listening sessions based on scheduled transmission periods and frequencies. The resource details specific station names, such as _Radio Habana Cuba_, _Deutsche Welle_, and _All India Radio_, alongside their operational times and assigned kilohertz frequencies. It also incorporates a distance calculator, which leverages geographical coordinates to estimate propagation paths, though it notes occasional data inaccuracies leading to transmitters appearing in oceanic locations. The platform's development log highlights continuous updates, including the integration of new seasonal schedules like "A24 frequencies" and "B23 schedule," reflecting the fluid nature of shortwave broadcasting. It documents challenges with geolocation services, particularly concerning Google API changes that impacted distance calculations and required user-side browser configuration adjustments for optimal functionality. The site owner, VAXXi, frequently communicates these technical adjustments and database updates, often acknowledging user contributions and donations. Distinctively, the resource provides a historical perspective through its update archives, illustrating the evolution of shortwave listening over more than a decade since its inception in 2011. It also mentions specific events, such as the BBC adding shortwave broadcasts for Ukraine on 5875 kHz and 15735 kHz, demonstrating its responsiveness to global events impacting broadcast schedules. The site's commitment to user feedback is evident in its bug reporting and feature request mechanisms, contributing to its ongoing refinement.

Free software tests for the Technician, General and Extra class licenses by Shenandoah

Leading supplier of low and high frequency electronic filter design products for the design of wireless telecommunications equipment, semiconductors and more

Welcome to Mike's radio collection, I collect and restore radio sets from the 1930's to the 1960's. I have built up quite a Collection of radios over the years, including Some rare Dutch and German sets.

Making your own 2 metre (146 MHz) 5/8th wave whip antenna

A 500-watt mobile antenna project details the conversion of an old 10m hamstick into a highly efficient, multiband "bugstick" for HF operation. The core modification involves replacing the original coil with 25 turns of 6 turns-per-inch, 1.5-inch diameter coil stock, fabricated from #14 wire. This design, intended for a 3-magnet mount on a vehicle cab, achieves resonance on multiple bands by shorting out specific turns on the coil, similar to a **bugcatcher** antenna. Measurements taken with an MFJ-259 analyzer on a GMC pickup show 0 turns shorted for 20 meters (14.2 MHz), 10 turns for 17 meters, 16 turns for 15 meters, 19 turns for 12 meters, and 23 turns for 10 meters. The construction emphasizes using UV-resistant tie-wraps and #14 solid wire with crimp lugs for robust RF connections, bypassing the fiberglass rod for current flow. A bonus section details a 40-meter version, utilizing 48 turns of 8 TPI, 2-inch diameter coil stock.

QRP and Electronic Kits manufacturer

A means of sync-ing your computer clock using a GPS Receiver. GPS2Time is another GPS network time synchronization software application for Window 7 and higher. Freeware.

Data Management for the RadioShack PRO-93/2053 Trunking Scanner

Yaesu, unofficial, mailing list reflector hosted on contesting.com. Here you can talk about Yaesu products.

Amps Mailing List Archives

WV7U's YC156 and 3CPX800 amplifier projects. Everything you wanted to know about using the YC156 or 3CPX800 in a ham radio linear amplifier. See pictures, schematics, test data, links, and more!

10 Meter Easy to build wire dipole antenna

A vertical antenna that can cover HF bands using an UN UN and a fishing pole, usage of tuner is requested.

Ram mounting systems is a world leader for design and manufacturing of mounting applications. ram mounts offer more than 900 interchangeable components for unlimited uses and configurations.

March Paddle by K4QU

This is a packet radio software developed for amateur radio operators to provide IP communications. You can chat, send/receive e-mail, surf the web and so on via radio depending on your bandwidth. You don't need a TNC. You might have all of TNC features via SoundCard using SoundModem.

Expert Electronics LLC is a manufacturer of modern and compact SDR transceivers. EE develops and produces modern radio-electronic devices based on SDR (Software Defined Radio) for radioamateurs and professional applications. Makers of popular SunSDR models and SunSDR-MB1 transceivers

A moxon antenna project for the 145 MHz

International Components Corporation has an extensive range of electronic components consisting of audible signal devices, speakers, microphones, capacitors, electron tubes, connectors, and accessories designed in recognition of the diversity of applications and special characteristics encountered by designers in today's complex world.

Technical details of the yaesu FT 9000

A freeware apple Macintosh-based program that helps amateur radio contesters by converting a log from a radio contest into the Cabrillo file format which may be submitted to the contest sponsor.

KE4UYP project for a top fed 1/4 wave lenght linear loaded vertical for 80m or 160m

EF155A1 21 MHz monobander antenna by YU7EF

Flash Movie describing HF (shortwave) radio propagation to beginners. Very helpful aid in understanding.

Near Vertical Incidence Skywave (NVIS) and the 40 meter Novice Sub-band.

Codec2, an open-source speech codec, targets low bit rate voice communication, specifically designed for digital radio applications operating within constrained bandwidths. The project focuses on achieving intelligible speech quality at data rates around 2400 bits per second, a critical parameter for efficient spectrum utilization in amateur radio. Its development addresses the need for robust voice transmission over channels where higher bit rate codecs would be impractical or inefficient. The resource details the technical specifications and implementation aspects of Codec2, including its underlying algorithms and performance characteristics. It provides insights into how the codec processes speech to achieve its low bit rate, outlining the various coding schemes and their impact on voice fidelity and error resilience. The information presented allows radio amateurs and developers to understand the codec's operational principles and its suitability for integration into custom digital communication systems. Applications for Codec2 extend to digital voice modes on HF and VHF bands, enabling more users to share limited spectrum resources. The project's open-source nature facilitates community contributions and widespread adoption, fostering innovation in digital amateur radio. It represents a significant effort to provide a freely available, high-performance speech coding solution for the amateur radio community.

Since February 2002, 3830scores.com has served as a central repository for amateur radio contest score rumors, allowing contesters to quickly post and view claimed scores and comments. The platform facilitates the sharing of **claimed scores** for numerous contests, including the ARRL DX Contest, CQ WPX RTTY Contest, and various QSO Parties. Users can access submittal forms for current and recent contests, with options to define and save default form values for efficiency. The site also provides links to the 3830 Reflector, where submissions are posted, fostering immediate community engagement regarding contest performance. Summaries of all submitted scores are instantly available, offering line scores, **band/mode breakdowns**, and compilations of operator comments. Historical summaries for major contests extend back to 2002, with all contest data accessible from 2007. The platform includes a search function to locate all postings associated with a specific call sign and a 'Compare Scores' feature, enabling side-by-side analysis of multiple calls across different contest editions or a single call's performance over several years.

These instructions use simple, generally familiar examples of equipment types and are designed to help you find the adjustment that suits you best. If you are looking on how to adjust a morse key, bencher key, paddle or straight morse key, here you will find all instructions.

W4KAZ article on antenna switches

Designers and manufacturers of radio Frequency antennas. HF - 3000 MHz TET Emtron HF Yagis, Antennas for Wireless applications, Marine antennas, Land mobile, Mobile antennas.

Listen online to NYPD Special Operations Division live radio audio feed.

Article about homebrewing a G5RV antenna by KC6CFF