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This is some general information about the lowell amateur radio club!

A ham radio home made preamplifier for 50 MHz and 70 MHz bands

Risca and District Amateur Radio Society Tredegar Terrace Risca Nr Newport

Association of NC State University alumni who are amateur radio operators.

Antenna most often used by Hams around the world. Inexpensive, effective and easy to build, what more could anyone ask for in a home made antenna.

This stacking offers a well known simple phasing technique. All elements can be fed in parallel by open wires provided that they are fed in phase. This can be achieved by twisting the open wire phasing-lines at 180 degrees.

Book on CW paddles, history of keyers, keyboards, oscillators, and all things related to automatic Morse code.

Mounting on roof at the right ground level can greately impact on antenna performances because will affect the radiated angle of energy.

A list of links on Crystal Radio projects and related reources

Dominica Island 2011 by DL7JAN

G0TRG - Trafford England

Duoband Yagi 2m/70cm with 4 Elements on 2 m and 5 Elements on 70 cm and one Feed point. The 4-El.-Ultralight-Yagi for 2m can be used on 70cm with an SWR of 1,5 without any changes.

A list of announced DX operations compiled by VA3RJ

Modification to an old cellular phone base station modules, with a fairly reduced output power (10 watts or so), the stock power amplifier modules will cover the 2.3 GHz and 2.4 GHz amateur radio bands.

The Bishop Auckland Radio Amateur Club

Sint Maarten by K1GI (PJ7I) 7L4DXT (PJ7XK) - 18 to 24 Nov 2012

Home made 40 meter transceiver project. The receiver is a Progressive Receiver with a few modifications. The Transmitter is a modified MFJ Cub circuit. Includes schematic and circuit diagrams for Receive Input Filter, 3-Pole 500 Hz Cohn Filter and 7 MHz Double Tuned Bandpass Filter

This web page is part of a self-help program for licensed amateur radio operators and radio pirates.

The club is based in the Newhey area of Rochdale in North West England at the Ellenroad Steam Museum.

A 50 MHz stable and small power amplifier, suitable for portable and domestic use. This RF Power amplifier delivers 900W with used pair of tubes primary installed into amplifier.

A SSTV interfsace (soundcard) to minimize RF feed back and a soundcard limiter to prevent over driving the soundcard

This is a simple 2.4 GHz SWR meter which is based around surplus microwave hardware which can be easily found. The main component is a MECA -20/-20 dB Directional Coupler which has a frequency range of approximately 700 MHz to 2.5 GHz.

Operating within the low-frequency spectrum, transformers serve critical roles in antenna systems, particularly for 160m applications. The resource details the construction and performance of 1:1 transformers built on BN-73-202 cores, emphasizing their use as hybrid combiners or phase inverters for RX antenna arrays. Measurements reveal that these transformers exhibit minimal losses, around 0.12 dB at 1.8 MHz, with variations based on wire type and number of turns. The analysis includes comparative data on transformer performance, highlighting the impact of different winding techniques on frequency response. Notably, the use of coaxial cable for winding improves bandwidth while maintaining low-frequency efficiency. The resource also discusses braid breaker transformers, which minimize inter-winding capacitance, achieving low losses around 0.21 dB at 1.8 MHz. These insights are crucial for optimizing low-band antenna systems, allowing operators to make informed decisions regarding transformer design and implementation.

This multiband transverter project features power output at 13,8V 50MHz 15W, 70MHz 10W, second harmonic < 65dBc. Single N connector of antenna, suitable for a dual band Yagi. Article include Block Diagram for Dual Transverter and low pass filters

Common-mode chokes are useful solutions for RFI reduction. Winding a few turns of coaxial cable on the FT 240-31 toroid can reduced the noise below the received noise floor. In this article author measure different chokes

The author has build the Hermes-Lite SDR v1 and v2 versions describing with a very accurated text and picture the process. Additionally has documented measurements for each component

A home mande spectrum analyzer project with several pictures and disposition of components boards based on a project by S57C

Icom IC-R9500 Professional Receiver with 5 roofing filters, 48 kHz DSP

Review of the excellent ICOM IC-R8600 Wide Band SDR communications receiver. Featuring Direct Sampling SDR below 30 MHz Hybrid Superhet / SDR above 30 MHz.

This app will generate a QSL card design based on the input paramters as a PDF. Fields marked by a * are required, but the rest are optional. The options at the bottom allow you to customise the look and feel of the QSL card. If you would like, you can also download the LaTeX source file and customise it.

QSLinfo.de is a QSL manager and address database for radio amateurs, maintained by Lothar, DL1SBF for more than 25 years already.

Elkhorn Valley Amateur Radio Club Norfolk

This page provides a list of scanner frequencies for hams in the UK. It offers a comprehensive guide for ham radio operators looking to find and tune into various frequencies for communication. The page is useful for hams who want to explore different channels and connect with fellow operators in the UK. Whether you are a beginner or an experienced ham radio enthusiast, this resource can help you discover new frequencies and expand your communication network.

DL7AFS, Babs and DJ7ZG 5-19 November 2012

Departamento de Radio Escutismo do Nucleo Moinhos de Vento Portugal

What is a QSL Card and what should be the content of each QSL card, collecting cards, electronic QSL LoTW eQSL, QSL Bureau, and QSL managers.

Personal web site by N9SKN about portable QRP operations with pictures of several portable setups and antenna solutions.

This page includes an interesting and comprehensive review of the ICOM IC-7300 SDR HF / 50 MHz transceiver. The author focuses on many aspects of this transceiver with impressions based on his experience

Review of the ICOM IC-R9500 Wide Band DSP Receiver

A collection of QSL cards from and old operator, Art J. Cook, VE4KZ, who lived in Calgary Alberta, that contained some from the far north of Canada.

Transmission lines have many uses other than simply transferring RF power from one point to another. Impedance matching, baluns and filters are probable the most common of these.

This page describes a printed circuit board that you may use to build a QRP keyer.

A guest review of the FLEX-6400M DSP HF Trasnceiver considering just the receiver part of this radio.

International Police Association Radio Club, OO6P

The high-frequency inductance of single-turn loops of various shapes made of round wire can be estimated accurately with a simplified formula

Review of the 150 kHz to 30 MHz Ten-Tec receiver

Official download page of TQSL software provided by ARRL as LoTW signing tool to upload QSO confirmations valid for ARRL Awards. TQSL download page provide links for Windows MacOS and Linux platforms.

Free PDF book to start learning morse code and to improve your proficiency, freely available in four languages english, german french and italian.

Discussion about laterally bent-end dipoles. Bent by percentage of length and fine-tuned by angling the bent ends.