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OEMSEMI is an independent distributor for electronic components, offering worldwide spot components supply service and solutions to obsolete components supply.

Shore Points Amateur Radio Club of Southern New Jersey, Atlantic County, NJ

W3FF, N7UN, WD9CMD, N7BF, WF2S, K9CJM,AA4OC, WU1B December 2011

by UARL UCC KCG and IRC

Interested is Lighthouses, in particular the International Lighthouse weekend event in August each year.

High Speed Multimedia (HSMM) radio, as introduced by John Champa, K8OCL, represents a significant advancement in amateur radio's digital capabilities, moving beyond traditional keyboard modes like packet radio. This initiative, driven by ARRL's Technology Task Force, focuses on developing high-speed digital radio networks capable of up to 20 megabits per second. HSMM primarily facilitates digital voice (DV) and digital video (ADV), enabling real-time video transmission from emergency scenes to an EOC without expensive ATV gear, often requiring only a laptop, a PCMCIA card, a digital camera, and a small antenna. The working group's initial efforts concentrate on cultivating microwave skills within the amateur community to build and support portable and fixed high-speed radio-based local networking, or **RLANs**. These networks prove invaluable for RACES and ARES organizations, as well as homeland security and other emergency communications. Field Day exercises and simulated emergency tests (SETs) are encouraged to hone skills in rapid site surveys and deploying broadband HSMM microwave radio networks, with examples like linking Field Day logging stations or antenna test results at the Midwest VHF-UHF Society Picnic 2003. Getting started with HSMM often involves adapting off-the-shelf **IEEE 802.11** (WiFi) equipment to comply with amateur radio regulations, typically operating in the 2.4 GHz ISM bands. While consumer WiFi gear has range limitations under Part 15 rules, proper setup under amateur regulations can extend coverage significantly, with test networks like the Hinternet achieving 5-15 mile ranges at 54 M bit/s using small mast-mounted dish antennas. Careful selection of equipment with external antenna ports, high transmit power, and low receive sensitivity is crucial, along with using low-loss coaxial cable like LMR-400 for optimal performance at these frequencies.

5J0BV San Andres y Providencia June 9 - June 23, 2010 by K7BV

HF propagation to your Linux desktop. CQRLOG uses data from HamQSL website provided by Paul, N0NBH.

Magane local repeater GB3HI

Our goal is to provide helpful and useful information to Ham Radio Beginners so you can get started as soon as you want to enjoy the amateur radio hobby.

Ham Radio personal web site

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.

Nikola Tesla created a basic design for radio

The Vacuum Tube Page with a lot of stuff about tubes

Bird 4314 RF Power Meter Battery Replacement

This quick-start guide is an attempt to provide some help when coming to terms with the R20 and the manual

Aeronautical communications products, radio communications, weather systems

Source for Pelican cases and accessories

Source for stock and custom cases, equipment cases, military and shipping cases

Common mode currents are those currents that flow in the same direction on a wire bundle, as opposed to the currents that flow

A review of the Wouxun VHF UHF handheld transceiver KG-UV8D

Solar and Heliospheric observatory

Liberia 2011 5M2TT DX Pedition Official web site

An online calculator for designing and evaluating capacitors based on the capacitor's area, separation, number, and dielectric constant

Successor to the Metamorserino, this is a multi-functional Morse code machine (Keyer, Generator, Trainer) that includes also a transceiver using LoRa on the 70cm band.

Tait Digital Mobile Radio (DMR) is an affordable digital communications platform that delivers a range of workforce efficiencies and operational benefits for mission critical users.

Troubleshooting & Support for Uniden BC 72 XLT

Voldatech, a manufacturer based in China, produces a range of RF feeder cables and site components essential for amateur radio installations and telecommunication infrastructure. Their product line includes various types of coaxial cables, such as **50 Ohm** and 75 Ohm options, along with a comprehensive selection of connectors like N-type, UHF, and BNC. These components are critical for maintaining signal integrity and minimizing loss in antenna systems, whether for a home shack or a remote DXpedition setup. The company's focus on _RF Coax cables_ and connectors directly supports the needs of radio amateurs seeking reliable transmission lines for their transceivers and antennas. Amateurs often compare Voldatech's offerings to established brands, evaluating factors such as impedance matching, shielding effectiveness, and durability under various environmental conditions. The availability of diverse cable types allows operators to select optimal solutions for different frequency bands and power levels, from QRP to high-power amplifier setups. Their products are particularly relevant for those constructing new antenna arrays or upgrading existing feedline systems, aiming to achieve maximum power transfer and reduce standing wave ratio (SWR) for efficient signal propagation.

This project enhances Arjan te Marvelde's uSDR-pico by integrating a waterfall display feature. By adding an ILI9341 240x320 2.4" TFT display and modifying the software, the goal is to provide a panadapter to the existing transceiver. Initially developed with Visual Studio, the code was later migrated to Arduino IDE for Raspberry Pi Pico compatibility. The focus remains on preserving the original software, primarily enhancing the dsp.c file for waterfall implementation.

Operating in challenging RF environments, DeepCW provides real-time Morse code decoding capabilities through a neural network model. The software excels at robustly interpreting weak signals, mitigating the effects of QSB, and performing effectively in noisy conditions, a common issue for CW operators. It also supports multi-channel decoding, allowing for the simultaneous interpretation of multiple CW signals present in the audio stream. The application integrates audio pass-through functionality, enhanced with deep-learning-based noise reduction to clean up the incoming audio before decoding. Benchmarking data indicates a 0.00% error rate from 0 to -4 dB SNR, with errors remaining below 1.5% at -8 dB SNR and under 8% at -10 dB SNR across the full range of CW speeds. The project provides comparative analyses against established decoders such as _CW Skimmer_, _fldigi_, and _ggmorse_, utilizing publicly available CW QSO videos from YouTube to demonstrate its performance. DeepCW is designed for cross-platform deployment, supporting Windows, macOS, Android, and iOS operating systems. The core _DeepCW Engine_, which houses the decoding model and a reference implementation, is available separately, offering Python and Node.js examples for decoding from WAV audio files.

Have you been looking for an easy way to measure power or SWR at 1296 MHz? One thing is certain, it is not easy - simply because the normal range of SWR meters that most of us have is not up to 1300 MHz.

Portable Rotation manufacturer of portable antenna rotor and support systems including AZ/EL portatble rotor system, AZ/EL antenna position sensors, mounting kits for arrow antennas

Complete test equipment dealers and distributors directory and test equipment community forum for engineers to share knowledge.

The areas noted in the forecast have the necessary atmospheric conditions to produce tropospheric bending of VHF, UHF and/or microwave radio waves. Tropospheric bending extends the range of radio & TV stations well beyond their normal limit and thus increases interference amongst stations as well.

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

Online Wifi shop based in Greece

Coastal Amateur Radio is for hams south of the Fraser. Even if you live north of the Fraser you are welcome to join in. Hams who come together for the love of HF & VHF in the hobby.

Unlike older radios, the 706 uses only one crystal oscillator (called the Master Oscillator). All other frequencies in the radio (L.O., 3-4 I.F. stages, VFO, and CW-offset) are computer-derived from the Master Oscillator. This makes it relatively simple to frequency-align the radio, so that it agrees with the Frequency Display in all modes.

West Fire and Police - Live Audio Feed Virginia

Real-time solar activity page at SpaceWeatherLive.com display sunspot regions, indicating sunspot numbers of with manitude class, Solar Flares and a list of daily events on the sun.

If you want to have a closer look at the weather, you can download software and visually display data.

The Sandy Amateur Radio Club was organized on September 25, 2014. It is open to any and all licensed amateur radio operators and anyone who is interested in the hobby

A review of the Yaesu FT-8900r 29/50/144/430 MHz FM Transceiver, providing 50 Watts of power output on the 29/50/144 MHz Amateur bands, and 35 Watts on the 430 MHz band.

AE6KE Repeater Repair Project Log, Icom IC-RP1510

A home made RDF 3 elements Yagi that can be used for fox hunting. The particularity of this antenna is that it can be folded, in order to save space while travelling. In Dutch.

A tutorial on how to get started operating RTTY using MMTTY as the primary program to begin your RTTY operations. Installing, configuring and using MMTTY. Documentation in English and Spanish

W7GJ 50 MHz EME DXpedition July 12 - July 28, 2014

Article on common Classification of Spy Numbers stations.

SMCC Amateur Radio Club - K9ONA