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This page contains a map of Chinese Prefixes.

Some Clegg 22'er radio pictures

A noncommercial site operated by Max Robinson and dedicated to passing on and preserving knowledge of vacuum tube circuits and techniques.

Info for temporary licence or operating in Greece.

an homemade ultra lightweight Morse code keyer paddle that can be used as a manual straight key

Lego MindStorms Iambic Keyer and Paddle Project by N9SSA

eham users review of the Kenwood TS-570D or TS-570G HF Transceivers

A simple morse code practice oscillator using either PNP or NPN typr transistors

A club for hams who are also regulars on IRC (Internet Relay Chat).

Contesting, CW, antennas and review on TK/OE5XVL DXpedition 1999 plus my GD/OE5OHO DXpedition in 1997.

VHF, 50 MHz contest, gallery and six meters infos

Running D-Rats on a Raspberry Pi documentation and instruction by n0so

IOTA Irish Islands

Audacity is a free, easy-to-use, multi-track audio editor and recorder for Windows, Mac OS X, GNU/Linux and other operating systems. The interface is translated into many languages.

Maker of filters, oscillators, cristals Coils, Toroidal Inductions, Solenoids, Bifilar wound Solenoids, Trifilar Solenoids and Transformers Located in Kansas City, Missouri

IC-7600 User Evaluation and Test Report by VA7OJ

This article describes how to build a general purpose DTMF decoder with a low-price chip from MITEL

LinLogBook is an logbook for hamradio and it is based on an sql database. It can be widely configured by the user.

This is about Small Antenna types and their properties which can help choosing proper antenna for high-frequency wireless communications as: two-way radio, microwave short links, repeaters, radio beacons or wireless telemetry

About Switchable Direction EWE Antenna

PEP RF output power measurement, and examples RF output power measurements

Web Site of Ukrainian Club Amateur Radio station from Vernadsky Research Station on Galindez island EM1U

The T-Match with its balanced feed point is one method of feeding a Balanced Dipole.

Adam, VA7OJ/AB4OJ's IC-756Pro III User Review

The free CW Speed Training Software for Windows by JI0VWL

Personal page

WorkedFields is a windows free software to displays a map showing the amateur radio field squares contacted and logged in using a third-party logging program.

A CB to six meter transverter project by ZS2ACP

Personal web page of Gerardo Pe?a. From Cuenca, in the South Center of Ecuador.

Magnetic Loop antenna for 20 to 80 meters band using home made butterfly condensator kit

Amateur SSTV from MIR, a 2 meter antenna for bicycles, working the AO-27 satellite portable, and photographs.

A group of American amateur radio operators who are living in Germany and come together to participate in amateur radio activities

IMO was created in response to an ever growing need for international cooperation of meteor amateur work. Radio Observations.

Table of power loss to SWR relation

The Nederlandse Vereniging voor Radio Amateurs (NVRA) operates from Haarlem, Netherlands, under the club callsign PI4HLM and maintains an ATV repeater, PI6HLM. The organization's website provides updates on internal governance, such as the postponement of a General Members Meeting due to necessary amendments to its 1986 statutes. These amendments are required to comply with the Wet Bestuur en Toezicht Rechtspersonen (WBTR) — Dutch legislation concerning the governance and supervision of legal entities. The NVRA's operational focus includes local amateur radio activities, indicated by its Haarlem location and the presence of a **PI6HLM** ATV repeater. The club's adherence to national legal frameworks for non-profit organizations, specifically the **WBTR**, demonstrates its structured approach to club management and long-term viability within the Dutch amateur radio community.

A frame antenna for the 80 meters band, built to be folded and to be easy to be mounted and dismounted. This antenna is suitable for indoor and QRP use, bandwidth is just 10kHz and should be observed a proper distance while transmitting due to high voltage.

eHam user reviews of the Yaesu FT-450 HF+6m t ransceiver

An EH Antenna for 14 MHz by EB3EMD based on an original project by F5SWN

WEB Site of UT5UGQ Olga

There are several reasons that can cause coax line radiation, most of them are related to wrong or missing use of a balun, but none can be imputed to load mismatch.

pythonProp is a collection of Python scripts designed to plot files produced by VOACAP. The package currently contains two scripts, both of which make use of the matplotlib library

NBTV (Narrow Band Television) is a technique with some similarity to SSTV, and some to conventional FSTV (Fast Scan TV). Like SSTV, it operates in a narrow bandwidth, suited to an HF SSB transceiver, but rather than send individual image frames, NBTV is designed to send multiple frames one after the othe.

This article describes the details of the design, which can be easily scaled for just about any HF band. The antenna described in this article is for the 20 meters band.

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.

A 4 element yagi beam antenna for the 17 meters band with pictures and element dimension and spacing

Piedmont NC ham radio and scanner information.

Antennas and operating note on 160 meters

Demonstrates a specialized **DX cluster** designed to support the annual Jamboree On The Air (JOTA) event, facilitating real-time spotting for participating Scout stations. While its web interface has been discontinued due to security concerns, the cluster remains fully operational and accessible through standard cluster software. Operators can connect to the JOTA cluster by pointing their client to www.pi4raz.nl on port 7300. This setup allows for the exchange of **DX spots** and other operational information relevant to JOTA participants, ensuring that Scouts and their amateur radio mentors can continue to make contacts and log stations during the event.

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.

Eham users review of this HF/VHF/UHF All Mode Transceiver.