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Eham members Yaesu VX-7R review

Index of logs hosted on DX.QSL.NET

80m hexfet power amplifier by W7ZOI

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.

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.

3 to 30 Mhz antenna analyzer schematic by YO3DAC / VA3IUL

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)

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.

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 40/60/80 is a portable loop that covers 80 meters with a high degree of compromise

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

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

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

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.

An interface for amplifier to TS-850S

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."

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

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

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

Iambic keyer with simple paddles and simple electronic circuit.

Quagi 8el 70cm improved 13.77dBi by IK1HGE

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

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

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.

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

Ham radio related catoons

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.

A 1:1 to 4:1 switchable balun by N1LO

A Versatile Innovative Portable Multi-band Tunable Antenna can work HF VHF and UHF ideal as portable or balcony antenna

Constructing a linear focus parabolic antenna for WiFi operation involves precise metalwork, as detailed in this project. The author, AB9IL, shares a build that can be completed in a few hours, emphasizing the hands-on process of shaping and assembling metal components. This design aims to provide enhanced signal range for 2.4 GHz wireless networks, a common challenge in many ham shacks and home setups. The project outlines the practical steps required, from initial measurements to the final assembly, including cutting, bending, and bolting various metal parts. While specific gain figures are not provided, the parabolic design inherently offers significant _directional gain_ compared to omnidirectional antennas, making it suitable for point-to-point links or extending network coverage over distances. The construction process focuses on readily available materials and basic shop tools, aligning with the DIY spirit prevalent in amateur radio. This antenna project is presented as a straightforward build, requiring attention to detail in fabrication to achieve optimal performance.

Echo Link client for Linux and general purpose voice services system for ham radio use. The svxlink server consists of a core that handles the connection to the tranceiver. The core can be configured to act as a repeater controller or to operate on a simplex channel

Worldwide jFindU d-star repeaters map