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Roach pole vertical antenna for 40 and 30 meters band featuring good performance on short skips contacts compared to wire dipole

The Northern Arizona DX Association exists to help hams enjoy the fun of radio contests and DXing.

International ham radio club of Belarus

Ham radio shop based in Holland, dealer for cb radio products, amateur radio transceiver,Yaesu Icom and Kenwood, antennas cables and accessories

A large CQ Zones World Map in Jpeg format.

The Delmarva Amateur Radio Club is located in Salisbury, Maryland

Presents field test results for an **elevated SuperAntenna MP-1** portable antenna, configured on a tripod for HF operations. The resource details the antenna's setup and performance during a portable activation, focusing on its use across the 40-meter, 20-meter, and 17-meter amateur bands. It includes observations on signal reports and operational considerations for this specific portable antenna configuration. The content provides practical insights into deploying the MP-1 antenna in a non-ground-mounted setup, which is often a point of interest for portable and QRP operators. It documents the author's experience with the antenna's tuning and effectiveness for making contacts under real-world conditions, offering a user-perspective review of its capabilities. The article also features photographic evidence of the antenna's deployment, illustrating the tripod mounting and the overall portable station setup.

Observing how fractal antennas might exhibit characteristics that are correlated to their form by kb7qhc

The ICOM IC-7610 SDR HF/50MHz Transceiver Basic Manual in English PDF File 13 MB

Installing a mobile rig in a vehicle requires careful planning and execution to ensure optimal performance and safety. The process begins with selecting the right equipment, such as the ICOM IC706MKII for low bands and the ALINCO DR-610 for VHF/UHF operations. Proper mounting is crucial; both radios are strategically placed under the back seat of the Silverado, allowing for a clean installation while maintaining passenger comfort. The Hustler antenna, equipped with various resonators, ensures coverage across multiple bands, while the LDG automatic antenna tuner fine-tunes the match for efficient operation. A remote head for the tuner enhances accessibility, making adjustments easier while driving. Each step of the installation is documented to provide insights and tips for fellow operators looking to enhance their mobile setup. The experience shared here reflects practical knowledge gained through hands-on work, aiming to inspire others in the ham community to undertake similar projects.

A surf between radio history, home made and the sea.

A public service amateur radio club. Haverhill, Massachusetts

Elecraft KX3 Review by a QRP DXer and Contester

The 2200-meter band (135.7-137.8 kHz) presents unique challenges for amateur radio operators due to its narrow 2.1 kHz bandwidth, low signal levels, and high noise. W1TAG explores various transmission modes suited for this demanding environment, highlighting that traditional voice modes like SSB and AM are impractical. Plain old CW serves as the baseline, demonstrating effectiveness across different modes, though signal-to-noise ratio (SNR) significantly limits practical speeds. The article notes that reducing CW speed below 5 WPM can improve copy, especially with computer-aided spectrum analysis software capable of decoding signals too weak for human ear reception. QRSS, or "CW sent slowly enough that speeds are best expressed in seconds per dot," is a key mode for LF work, with examples ranging from 3 seconds/dot to extreme 240 seconds/dot transmissions. _Argo_ by I2PHD is mentioned as a simple program for QRSS, enabling reception of signals like BRO, a Part 15 beacon, at a distance of **1100 miles**. Other modes discussed include Dual Frequency CW (DFCW), which uses frequency shifts to distinguish dots and dashes, and Binary Phase Shift Keying (BPSK), a phase modulation technique employing 0 to 180-degree phase flips. WOLF (Weak-signal Operation on Low Frequency), a specialized BPSK form by KK7KA, encodes 15-character messages into 960-bit packages, taking 96 seconds to transmit, and has demonstrated successful reception over **672 seconds** for a message from a 1-watt beacon. Further modes include PSK, FSK variations like JASON and MSK, and graphical modes such as Hellschreiber and Chirped Hell. The article concludes with a practical chart comparing the time required to send a simple message like "WD2XES FN42CH " across these diverse LF modes, offering valuable insights for operators planning contacts on the low bands.

LA3ZA on magnetospheric ducting as an explanation for delayed signals on 3.5 MHz

SDR software for SDRPlay RSP1, RSP1A, RSP2, RSP2PRO. SDRuno is an advanced Software Defined Radio Application platform which is optimized for use with SDRplay's range of Radio Spectrum Processors

Dx on Hf specially on low bands from Zante island Greece

Travis County ARES, Austin Texas

Founded in 1954, the Alexandria Radio Club takes pride in our service to the community.

The Waterville Area Wireless Association was founded in 1957

9M6MU Alfons details his family's efforts to establish an independent, self-sufficient home at Eagle Plateau in Borneo, a 50-acre highland property. The resource highlights their integration of **solar photovoltaic panels** for power generation, alongside managing water supplies, organic gardens, and fruit trees. It covers the practical challenges and rewards of living off-grid, including maintaining power generators and addressing infrastructure needs, all while pursuing the hobby of amateur radio. The narrative emphasizes a holistic approach to healthy living and nature conservation, reflecting the family's aspirations for an ideal ham world. Alfons and his XYL Doris share their experiences in building shelter and antenna farms, showcasing their dedication to independence and sustainable practices away from the conventional grid. The site also references the Hillview Gardens Amateur Radio Club, suggesting community involvement.

The correct procedure for measuring SSB PEP (Peak Envelope Power), using an oscilloscope with a vertical bandwidth of at least 20 MHz, or a monitor scope.

Official aprs.fi iOS app, immediate real-time visibility to APRS traffic near you and around the world.

An Amateur Radio enthusiast living in the North of England. A keen DXer and Contester.CoSysop GB7MBC DXCluster. Member of Sands Contest Group MX0SCG/M0SCG

M5AML - SSTV, Aerials (antennas), SSTV, Rallies, UK prefixes

NOAA Satellite Signals With a PVC QFH Antenna and Laptop, this website also link to a github where you can find files and supporting documentation for constructing a QFH Antenna

Electric Fields, magnetic fields, electromagnetic fields, losses, fresnel zone, nearfield and farfield

TS-850 is not much effective on AM since it does produce fairly clean audio, however while it does noticeably improve low-end frequency response

A page dedicated to top band transmitting equipment and operations by VK3YE

Software to create virtual com ports when you need to assing different serial ports and you have just one COM port on your PC. Commercial version

XQ3SA personal website and Chilean Internet Callbook.

Build a 7 Element 4M (70MHz) Beam By Paul M1CCZ

Radio frequencies for Bergen County located in Northern New Jersey

Article on Yagi and Log periodic antennas by Tom, K1JJ

Amateur radio antenna maker with online shop based in Brazil

Listen to online police scanner from Douglas County in Oregon USA

A technical explanation of what is a mesh node in HSMM-Mesh HamNet, with explaination of specific roles of each network interface

The N1HFX thermal cooling fan controller project details a practical circuit designed to manage cooling fan operation based on temperature, a common requirement for high-power amateur radio equipment. This build utilizes a **LM34** temperature sensor, providing a linear voltage output directly proportional to Fahrenheit degrees, simplifying the control logic. The circuit's core functionality involves a comparator that activates the fan when a preset temperature threshold is exceeded, ensuring efficient cooling and reducing unnecessary fan noise. This controller is particularly useful for amplifiers, power supplies, or transceivers that generate significant heat during operation. The design incorporates a _TIP120 Darlington transistor_ to drive the fan, capable of handling up to 5 amps, making it suitable for a range of fan sizes and current requirements. Field results indicate stable temperature regulation, preventing thermal runaway in enclosed environments. Construction involves readily available components, making it an accessible project for hams looking to optimize their station's thermal management.

Biafra nation

Waarci - warrensburg area amateur radio club inc.

A 2 elements yagi beam for 12 meters band with liear load

Ham Radio News, Information, and Operating Activities of Ron, WD4AHZ

The KI7CX 2.4 GHz Cheap & Easy antenna/feed

Sleeping tecniques during contest operations. This article originally appeared in the National Contest Journal.

General rules for All ARRL Contests

Baccalieu amateur radio klub inc. is located in carbonear, newfoundland

Wikipedia page on Notch filter, a narrow stopband - high Q factor filter

VK1OD informations on BPL