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A near-copy of the PIC-E running the GPS-2E firmware

Arrow-Style VHF/UHF portable satellite antenna by VE2ZAZ

Eham members Yaesu VX-7R review

Classified ads at eham dot net. Buy and sell your second hand amateur radio equipment

Index of logs hosted on DX.QSL.NET

80m hexfet power amplifier by W7ZOI

Online javascript antenna calculator designed to give the critical information of a particular beam antenna, in this case a seven element Yagi, for the frequency chosen.

3 to 30 Mhz antenna analyzer schematic by YO3DAC / VA3IUL

CQiNet is a family of programs that combine Ham Radio with the Internet using Voice over IP (VoIP) technology. Two programs are currently in the family, "theBridge" and echoLinux. Thebridge is a iLink/EchoLink compatable conference bridge that runs under various versions of Unix as well as Windows. EchoLinux is a EchoLink client program for the Linux operating system.

The best way to describe a go-box is a complete amateur radio station in a box. An example is described in this article. The project describes building a portable amateur (ham) radio station, known as a "go-box," housed in a durable orange Pelican case. The go-box contains all necessary radio equipment except for external power and antennae, which are carried separately. It includes items like a Yaesu transceiver, power supply, antenna tuner, speaker, and a clock. The case is designed for mobility and visibility, with a vertical layout to allow in-vehicle operation. Future upgrades might include cooling fans, an LED lamp, and built-in antennae for better functionality in various conditions.

How to solder PL-259’s compiled by K1VR

SerialKey is a Freeware DOS Morse code keyboard that uses the serial port, by Jeff Rowberg (KF6RLU)

Operating amateur radio satellites effectively requires precise knowledge of their orbital mechanics and pass times. Gpredict, a real-time satellite tracking and orbit prediction application, addresses this need by allowing operators to monitor numerous satellites simultaneously. It displays critical data such as position and pass details through various visualizations, including lists, tables, maps, and _polar plots_. Unlike many other satellite tracking programs, Gpredict introduces the concept of visualization modules. These modules enable users to group satellites and configure each group independently, offering unparalleled flexibility in how orbital data is presented. This modular approach supports tracking satellites from multiple observer locations concurrently, which is particularly useful for stations with diverse antenna setups or remote operations. Originally a GUI client for John Magliacane's _Predict_ program, Gpredict evolved to integrate its own tracking code for improved performance. The software is distributed under the GNU General Public License, ensuring it remains free and modifiable for the amateur radio community.

Faqs on six meters band, designed to help encourage hams to use and enjoy this band

Simple, easy to built match developed in 1995 for Yagis with resistitive loads of 12.5, 18 and 28 Ohm.

The DSP Satellite Transceiver is a conceptual transceiver designed as a dedicated unit for amateur satellite operators. The initial concept was brought about by the lack of satellite functionality on modern amateur radio transceivers, and the specialized requirements of the ham radio operator who utilizes OSCAR amateur satellites.

An interface for amplifier to TS-850S

This resource presents over 100 Q-signals, each with its corresponding question and answer format, as standardized by the International Telecommunication Union. The content delineates how these abbreviations can be expanded with additional groups, call signs, place names, or numerical data to provide specific context. It clarifies that a question mark following an abbreviation or its complementary information transforms it into a query. The document highlights that these operating signals, or Op Sigs, are prescribed for international use across all communication types, including military and non-military applications. It references their inclusion in Appendix 9 to the Radio Regulations Annex of the International Telecommunications Convention (Atlantic City) 1947 for QRA to QUZ blocks, and ICAO publications Dec 6100-COM/504/1 for QAA to QNZ blocks. The page specifically marks Q-signals of particular interest to amateur radio operators in red. The utility of Q-signals for concise communication in radiotelegraphy is evident, providing a structured method for conveying complex information efficiently. The resource serves as a practical reference for operators needing to quickly interpret or formulate messages using standardized codes, particularly beneficial for CW operation and international contacts.

Winding Toroids can be a real hassle for those of use who are left-handed or not so dexterous as we once were.

A model of a Guanella 1:1 VHF choke balun using a FT140-61 core

Advanced QRP Low Cost Mosfets HF Linear Amplifier with schematics, IMD, gain data and more. Six articles about amateur radio.

Demonstrates CW Decoder Logic, a freeware application for Windows Vista SP2, 7, 8, and 10, designed to decode Morse code signals. The software incorporates an optimized 80 Hz DSP filter, enabling reception of CW signals across a speed range of 5 to 60 WPM. Key features include automatic signal tracking within a 3 KHz range, real-time speed detection, and an auto squelch function, enhancing decoder sensitivity and accuracy. The application provides station selection directly on a waterfall display and includes a "Tips" feature for word annotations. It supports sending decoded text to external logging software via UDP protocol, with a logger source code example provided for developers. Configuration options allow users to set speed limitations and customize interface elements. Released initially on October 17, 2016, with subsequent updates, the program requires Microsoft .NET Framework 4.5 or higher. Changelogs detail improvements such as increased program stability, code optimizations for speed, and fixes for display issues across different Windows versions.

This article proposes a lossy transmission line model of a practical Guanella 1:1 balun that is effective for all frequencies within and immediately adjacent to the pass band

"You tap on computer keyboard in Morse; what you tapped appears as letters on screen."

This program will run all possible combinations of every transmitter against every receiver in its list

The purpose of this page is to capture and document the Yaesu FT-101 series radios during the 1970's

US national radio amateur civil emergency service web site

Iambic keyer with simple paddles and simple electronic circuit.

An online audio signal generator application capable to reproduce different waveforms with variable frequency range

Match & display imped of antennas, can graphically visualize and compare two sets of measured impedances simultaneously.

Amateur radio programs to download, locator , log, etc... for Psion Aprs maps for PC (ui-view)

I4FAF etrode Tube Linear Amplifier experience

Quagi 8el 70cm improved 13.77dBi by IK1HGE

PocketPC freeware that track satellites, and display their position on a map of the world. It also has a display that shows other relevant information useful to Ham Radio operators to allow them to work them.

This Magnetic Longwire Balun (MLB) makes it possible to efficiently use a coaxial lead-in cable with all forms of longwires, T-forms or other types of wire antennas, without the need for an antenna tuner.

Illustrates the global distribution of **DX-Cluster** nodes through an interactive map interface, enabling radio amateurs to visualize and access real-time DX spots. The resource provides direct TELNET and HYPER links for each node, facilitating immediate connection to various clusters for up-to-the-minute propagation information and station activity. This visual approach simplifies the process of locating and connecting to a suitable DX-Cluster, whether for local or international DXing. Amateurs can use this tool to quickly identify active clusters in different geographic regions, which is particularly useful for **DXpedition** planning or contest operations. The direct links streamline access, bypassing manual configuration for many cluster types. It serves as a practical aid for operators seeking to monitor band conditions, find rare DX, or participate in competitive operating events by leveraging aggregated spotting data.

Ham radio related catoons

Enables out-of-band transmit for 1.6 MHz to 54 MHz, Improved VHF recieve mod, other band expansions

Smith is a professional Computer Smith-Chart Tool and S-Parameter Plot for windows, special price for hams and students by Fritz Dellsperger

VHF, UHF page, technical articles, projects, datasheets

ON6MU Optimized 10 and 6 and 4 element UHF Yagi Antenna

This article documents an unobtrusive antenna for operation on 7MHz, primarily for contacts with stations at up to 1000Km range.

OE1MWW monopole antenna made with common RG 58 or RG 213 coaxial cable

Includes links and documentation on wifi antennas, 2.4 GHz Coffee Can Feed Antennas

This little antenna is cheap and easy to build, lightweight, and very functional on 2 meters and 70 centimeters by NA4IT

DX listening and broadcasting news

W0OXB All-band Centerfed Zep Antenna 160m-6m

Why Multi-band Dipoles Need HEAVY Open Wire Line by Tom, K1JJ

Answers to frequently asked questions for newcomers to the sport of amateur radio contesting.

For amateur radio operators seeking a specific call sign, RadioQTH offers a specialized online service to track FCC vanity license applications. The platform provides detailed listings of ham call signs from the FCC database, indicating those becoming available for vanity requests on specific dates. Users can access links to future availability, view recently granted vanity applications, and check the current status of applications already filed with the FCC. The data is sortable by call prefix, district, or suffix, facilitating a targeted search for desired call signs. This resource leverages real-time FCC data to assist hams in navigating the vanity call sign application process. It serves as a practical tool for predicting when a call sign might be obtainable, which is crucial for operators planning to upgrade or personalize their station identity. The site's functionality helps users monitor the progress of their own applications or identify potential call signs for future acquisition, streamlining a process that can otherwise be quite opaque.