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A successful 80 meter antenna only 38 feet high on one end and 4 1/2 feet on the other

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

IC-7600 User Evaluation and Test Report by VA7OJ

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

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

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.

This page contains a map of Chinese Prefixes.

Info for temporary licence or operating in Greece.

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

VHF, 50 MHz contest, gallery and six meters infos

Lego MindStorms Iambic Keyer and Paddle Project by N9SSA

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.

The Null-modem emulator is an open source kernel-mode virtual serial port driver for Windows, available freely under GPL license.Allows you to create an unlimited number of virtual COM port pairs and use any pair to connect one COM port based application to another.

IOTA Irish Islands

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

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

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

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

A CB to six meter transverter project by ZS2ACP

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

The free CW Speed Training Software for Windows by JI0VWL

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.

Xastir MacOSX APRS software for receiving and plotting APRS(tm) position packets. Xastir supports many map formats and is highly customizable

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

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.

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

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

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

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

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

Table of power loss to SWR relation

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

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

Personal page

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.

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

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

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.

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.

Whether Hamradio software, Transceiver or Receiver, WiFi sticks as well as practical accessories. Bonito have everything around the topic Hamradio.

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.

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

Antennas and operating note on 160 meters

Wouxun KG-UVD1P Tips And Hints For Eyes-Free Operation

A combined 144MHz Low-Pass and 432 MHz Notch Filter by VE2ZAZ

DragonOS is a linux distribution dedicate to Software Defined Radio. It leverages the portability, security, and power of Lubuntu Linux as a delivery package and operating environment for a pre-installed suite of the most powerful and accessible open source SDR software. DragonOS has verified support for a range of inexpensive and powerful SDR hardware, including RTL-SDR, HackRF One, LimeSDR, BladeRF, and many others.

This project was intended to accompany the stealth antenna project. Author want to see how effective a noise canceller could be in reducing the background noise floor when attic / stealth antennas are being used.

Port of the popular VOACAP program, HF propagation prediction tool. It may be compiled using the GCC GFortran compiler