Search results

Kc2uoo review of the yaesu ft-450 in this youtube video

Free windows morse code learning program. Whether you want to learn Morse code from scratch, never having heard a dit in your life, or you just want to speed up your copy for CW contesting, CW Teacher will help

A spiral antenna experiment for RTL SDR usage.

Quarter wave omni-directional spider antenna for 2.4GHz 802.11b

6 Meter 1/4 Wave Antenna by Mike Fedler N6TWW. A detailed article with pictures of construction details of this 50 Mhz antenna

How to become a High Speed CW operator, summary of information by AH6NB

A magnetic loops for HF pedestrian mobile project by VK3YE

A very portable Umbrella Dish for the A0-40 Satellite operation, by G6LVB

Assisting applicants in obtaining the various FCC-issued Amateur and Commercial Radio Operator licenses.

A simple antenna analyser for the HF spectrum with a built-in signal generator with 3-digit LED frequency display.

Repairing and restoring a Yaesu FL-2100Z amplifier

Software for analysis of guyed and self-supporting towers & poles

The Double Bazooka Dipole is a very efficient single band antenna which is very quite,and does not require the use of a balun. This antenna consists of coax (RG58) with the shield split at the center and the feedline attached to the open ends.

A comparison of multiband dipoles, including jumpered dipole versus fan dipole antennas, dipole fed by ladder line, resonant dipoles antennas. ARRL lab notes

High pass filter schematics for TVI and examples of finished filters

Software Defined Radio Projects, HF Receivers and Transceivers projects by YU1LM/QRP

We intend for this page to tell our story as well as be a resource for other "hams"

Telephone EMI, questions and answers on how to solve interference problems to phone lines

Assembling a Code-Practice Oscillator, a PDF by ARRL

The resource details the construction of a homebrew 50-watt FET amplifier, based on Don W6JL's _QST Homebrew contest_-winning design from 2009. It functions as an afterburner for QRP transceivers, providing a **12dB** power lift. The amplifier utilizes IRFZ24N FETs and covers the 80, 40, 30, and 20-meter bands, with the 20m LPF extending to 17m. Key technical aspects include an FT37-43 transformer for the input network, a relay-switched 3dB pad for lower bands controlled by an _Arduino Nano_, and an RF-actuated T/R switch. The LPF board integrates four relay-switched filters rated for 50 watts, using capacitors with a minimum 250VDC rating. Performance measurements indicate a power gain ranging from **4.4dB** on 20m to 8.1dB on 80m, with a required drive power of approximately 5 watts. The article also discusses thermal management, current limiting considerations, and component sourcing.

The ZS6BKW multi-band antenna, an optimized variant of the classic G5RV, is presented with detailed construction and tuning instructions. This resource outlines the antenna's design principles, which were developed by _Brian Austin (G0GSF)_ using computer programs and Smith charts to achieve optimal dimensions. It provides specific guidance on calculating and adjusting the lengths of the radiators (L1) and the matching ladder line (L2), emphasizing the critical role of velocity factor (VF) in achieving resonance. The article includes a step-by-step procedure for empirically determining the VF of ladder line using an antenna analyzer, ensuring accurate physical lengths for the matching section. It details the tuning process for the radiators, offering practical tips for incremental adjustments to achieve the best SWR curve. The resource presents SWR measurement results obtained with an _AIM-4170C_ analyzer across multiple bands, alongside predicted SWR graphs from an AutoEZ model. It confirms successful contacts on 80, 40, 20, and 17 meters, including a **17-meter DX contact** to Italy. EZNEC and AutoEZ models for the ZS6BKW antenna, covering 80 through 6 meters, are provided for download, allowing further analysis and customization. The document specifies component details, such as the use of Wireman 554 ladder line and #14 AWG THHN copper wire, and discusses the antenna's performance characteristics, noting high SWR on 15 and 30 meters but successful tuning on 6 and 80 meters with an external tuner.

A vertical antenna for Six Meters band

Low signal, noise-high AC gain preamplifier

Heathkit Icom Kenwood Power Transistors Ten Tec Yaesu spare Hamradio parts.

Pics and specifications

5000+ member discussion group for the low-cost series of SoftRock SDR receiver and transceiver kits.

Home Page of Ivan, 9H1PI, QRV from the island of Malta on 50 MHz.

Sounds from the 136 kHz band

A compact 2 element W8JK beam antenna for 20M to 10M bands by AF6SA

Sleeve baluns are normally used at VHF and higher. As a general rule, they are not practical at HF. The balun can be inverted and used as a skirt to form part of the antenna element

Logipic is a PIC Programer for windows

Founded in 1946 in the UK, the ISWL is Global. We cater for Licensed Amateurs and all types of Shortwave Listeners. Offer a comprehensive awards programme and run a very efficient QSL Bureau.

conversion of low band VHF AWA 25M-22 carphone onto 6 metres.

Specifiation at rigreference.com about Yaesu VX-8R/E

Circuit Diagram and Construction of the Bartling RX-40 Joachim Munch DF4ZS

Comments received from QRP-L members concerning their experiences with GAP antennas.

Windows Magnetic Loop antenna design software by DG0KW in Detusch

The RasHAWK team has used a Raspberry Pi as the basis for a networked RF sensor capable of supporting spectrum monitoring, signal intercept and direction finding (DF) operations.

The Yaesu FL2100Z is a HF linear amplifier rated for 1200W PEP input, and using two 572B triode tubes. This article explores the recommended operating conditions, and alternatives.

At LCWO you can learn Morse telegraphy (CW) online in your browser, use Koch Method, compare your results with others, speed practice and more

DXpeditions to Mauritius Island from 1996 till today. Island infos, log-search, contry infos and many more

A dipole antenna for 7 MHz support for this antenna is fiberglass military mast

Oklahoma's Largest Amateur Radio Hamfest

In this PDF article Zack Lau describe how to homebrew a four element yagi beam antenna for 50 MHz band, including how to build mounting blocks and tubing clamps to hold elements.

A project for a 50 MHz moxon rectangle antenna

Cabrillo2Adif A software for converting the radio logs from Cabrillo to Adif log format (for Mac OS X)

SSTV, pictures, home brew from sweden

Amateur Radioastronomy in Poland

This is an internet resource for those interested in guitar amplifiers, vacuum tubes, and design tools such as SPICE modelling.