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Undestanding and measuring SWR, Standing Wave Ratio in antenna feed lines. This article also introduce basic concepts and usage guidelines of amateur radio antenna tuners

A remote rotor controller, you can use to connect your laptop tablet or smartphone directly to the rotor using it as a Acces point or alternatively it can be connected to existing Wi-Fi network

Manfrotto shoulder bag Amica 25W can be used as a low cost carry bag for Elecraft KX3.

DOMINO DF is a sensitive mode which, due to its incremental frequency keying and thanks to its interleaved multiple tones sets, is easy to tune and is few sensitive to interference and ionospheric effects. Domino faeture a great signal to noise ratio.

DK8KW Longwave Information Slow-Voice, Transmitting compressed analog Audio Signals on LF

Free to download PDF book about operating The VHF/UHF bands written in the early to mid-1990s by a team of experienced VHF/UHF DXers and equipment developers, in an effort to pass on their knowledge and stimulate further developments.

A home made Antenna Tuner made with a simple inductor and a few spare parts. Despite the title, the author succesfully tested this ATU with higher power inputs.

A detailed review of the Icom IC-7700 by VA7OJ/AB4OJ

A project about reversible unidirectional Beverage antennas plus a remote switching system conveniently controlled by the operator

Tutorial- WSPR receiver with Raspberry Pi and RTL-SDR

Current Solar Wind Conditions

Tips on QSLing. Once you work that DX station, you have won the battle, but the war may just be beginning. I am talking about getting the QSL card. There are several ways to go about this.

If your club holds only two-meter ARDF events, you are missing half the fun. There is another international foxhunting band, too.

Worked other amateur stations in each of the six continental areas of the world using Collins equipment two-way

With BktDxCluster you can connect to all DX Cluster with DXSpider Protocol and telnet connection, filter the spots, send new spots, send commands to the cluster, set the radio to the frequency of the spot through BktRemote. Adroid App

A 60-foot available space, for example, might necessitate a shortened multiband dipole array to cover 80, 40, and 15 meters effectively. This resource details the construction of such an antenna, combining full-size and coil-loaded dipoles on a single feedline. It addresses the common challenge of fitting multiple HF bands into restricted physical footprints, providing practical guidance for hams with smaller backyards or portable operations. The core of the offering is an interactive calculator that determines required loading coil inductance and dipole lengths for various amateur bands from 160m to 10m. Users input their available space, and the tool provides dimensions, coil turns, and an efficiency rating (Good or Fair) based on the antenna's electrical length relative to a quarter-wavelength. It also suggests suitable _PVC_ pipe diameters for coil forms. The article further illustrates a center feed-point assembly using an 18-inch section of 2-inch _PVC_ pipe, detailing eye-bolt spacing and coaxial connector installation. It emphasizes the importance of adequate spacing between parallel dipoles and offers customization options for the feed-point, including the addition of a _Balun_ for improved feedline isolation.

This article discusses how volume reduction can help in the reception of weak signals by reducing the noise level. It is commonly known that reducing the volume also reduces the background noise, and especially in the reception of weak digital signals it can be beneficial

If You are using a separate receive antennas then you need a good protection circuit to eliminate the possibility of blowing out the receiver front-end while using these auxiliary receive antennas specially on low bands.

Worked DL Flora & Fauna award Germany

Holiday style dx pedition to Curacao 28 June untill 7 July 2013

Yaesu FT-450D HF / 6 Meter DSP Transceiver, a nice affordable transceiver for amateur radio use, but understand the caveats.

Learn how to build a QRP digital transceiver with Arduino, based on a project by Burkhard Kainka. This article covers the development process, including the source code, modifications made, and the addition of an OLED display for a more professional look. Discover the inner workings of the transceiver, from the receiver to the oscillator, and how components like the CD2003 are utilized. Explore the schematic design, the use of a PLL module Si5351A controlled by Arduino nano, and more. Ideal for hams looking to create their own digital transceiver for amateur radio operations.

Jim, G3RTE and I will be QRV as H44KW from Honiara, Guadalcanal in the Solomon Islands from the 18th to the 28th February 2013.

Jim, G3RTE and Phil, G3SWH will be QRV on all bands 80 to 10 metres as VK9C/G6AY on CW only from the Cocos Island Motel on West Island between 22nd February and 5th March 2011

Most Common Service Questions for the Icom IC-R7000 and IC-R7100

HA3AUI in Senegal Feb to March 2011

A stacked Yagi array for ZL1SIX 2m WSPR

10 Elements Cross-Yagi Antenna for 433 MHz. The base of the 10el antenna is the recalculated RA6FOO antenna.Circular polarization is realized - by a phasing quarter-wave line, matching of horizontal and vertical polarization antennas

The Icom IC-PW1 is a 1000 watt linear amplifier with built-in power supply

This is the mobile version of the DK0TE WebSDR providing HF ham radio bands coverage.

DL2RUM will be active as FS/DL2RUM between 3-Dec-2011 and 12-Dec-2011 include DL2RUM Online log

On the field comparison among C-Pole antenna, an EFHW vertical antenna and an Inverter V dipole antenna. Test is done using two identical WSPRLite beacons that transmit with 200mW on the WSPR frequency and analyzing spotted results.

How to install a BNC connector on a coaxial cable like the ELSPEC1030AF / HPF195RG and 58C/U cables

This 10 meter antenna is right out of the ARRL Antenna Book. There are 5 elements on a 24 feet boom and it performs well from 28.0 to 28.9 MHz.

How to setup the Yaesu FT-847 along to the PSTRotator under Windows 10 PC with Omnirig.

The collinear J-Pole, often known as the Super-J, does improve the behavior over a regular J-Pole. there is an advantage when vertically combining 1/2 radiating sections to have a bit of separation between the half-wave end points. Get 0.8 dB more gain out of the trusty Super-J by replacing the traditional phasing stub with a long coil.

A collection of QSL confirming EME contacts

Vertical end fed antenna used for portable operations. The antenna will work on 80 with acceptable results, it will work fine on 40m, and it will be a good deal better than a normal 1/4 wave GP on 20, 17, 15 meters.

Parker plastics shipping containers

xCAT is an helper application for the FlexRadio 6000 series running on macOS computers to control via CAT protocol tranceivers, while xDAX purpose is to provide a way for Digital Mode Software like Fldigi, WSJT-X to access the digital audio data (DAX) of the FlexRadioTM

Some Elecraft K2 Modifications by G3RXQ

Mint tin transformed into a switched 9v battery to Anderson PowerPole

This active antenna for the shortwave band provides surprising performance, even indoors. As the name implies, the main loop is made from a Hula-Hoop with the metallic paint stripped off and a single turn of 14AWG copper wire inserted inside the hoop.

TO3X Saint Barthelemy dx pedition 2012

Telnet client for DXCluster, Sorts, colours and filters DX Spots by (2) bands, wanted DX Station, who spotted the DX, local to your area and more, Can spot automatically after logging a contact if you are using ZCZ Log, Look up call on QRZ.com

Not a project yet, but very theoretical thoughts about very practical amplifiers!

recognized Amateur Radio Frequency Coordinating entity for the State of Arkansas.

Decoding 433MHz-transmissions with software-defined radio.

Burlington county radio club K2TD sponsor the New Jersey QSO Party

An optocoupled audio interface between PC and Transceiver for digital modes. The article includes full schematic of complete board and build instructions.