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Union Schweizerischer Kurzwellen-Amateure

The web pages of VU2PTT, Prasad Rajagopal, also AT2PTT, AT0PTT. Information on ham radio operations, Contest log book searches

The South Canadian Amateur Radio Society (SCARS) is known throughout Cleveland County, Oklahoma

A home made 50 MHz KW power amplifier project with picture and PCB schematic by W6PQL

Ham radio dealer. Antennas, connectors, books, maps baluns and spare antenna components

KK5DR review of the IC-7700 HF ICOM Transceiver

Amateur Radio: Links to Lots

MF TeleType is a program for amateur radio digital communication via sound card, ham radio chat program for extra reliable text transmissions over long distance

Investigates the legal framework surrounding **pneumatic antenna launchers** in Victoria, Australia, specifically their classification under the Firearms Act 1996. The author, VK3KBC, details how these devices, designed to discharge a projectile by compressed air, are defined as 'firearms' and subsequently categorized as **Category E Longarms**. This classification carries significant penalties for unregistered possession or use, with the author noting the lack of provisions for amateur radio operators to legally possess and use such devices for antenna deployment. The author shares personal experiences needing such devices for portable HF radio operations, contrasting them with previously legal slingshots and current alternatives like kites or bow and arrow. VK3KBC outlines efforts to advocate for legislative change, including submissions to the Wireless Institute of Australia (WIA) and the Victorian Department of Justice, proposing an amendment to Section 3(i) of the Firearms Act 1996 to include amateur radio field operations as an exempted use. The resource also reviews the original intent of the Category E firearm classification, suggesting that pneumatic antenna launchers may have been assigned this category in the absence of a more suitable alternative.

The first Kuwaiti contest club,idea of 9K2RR

Provide for the short wave listener, amateurs, local commercial community and business with a wide range of radio based services and products. Icom dealer

The dipole shown in this document is installed in an inverted Vee configuration, with two leg elements on each side held parallel to each other by 21cm spacers. The upper leg is for 40m and the lower leg for 20m. The spacers are made of 7mm plastic garden hose support for garden sprayers cut to 21cm.

Charlie Papa India RhAne-Alpes & Bourgogne HQ

A Simple Delta Loop Antenna for Smaller Vessels

ANDAMAN ISL. 2006 VU4AN on AS-001, BANABA ISL. 2004 T33C on OC-018, MYANMAR 2003 XY4KQ on AS-167, MYANMAR 2002 + XY0TA on AS-165, CAMBODIA 2001 + XU7ABR on AS-133

Le Club radio-amateur Beziers

A manufacturer of standby and prime power generator sets for industrial, telecommunication, commercial, small business, mobile and residential applications.

Ararat Shrine Radio Club of Kansas City

Amateur radio repeater scanner at Pomona California

Javascript filter design page with introduction to low pass filters by k7mem

30 meters beacon from UK. QRSS is a method of sending very slow morse code.

Spectrum Microwave is a market leader in the world of RF & Microwave components and system

Organizers for 9k 15-m contest

How to make proper maintenance of your antenna. Fighting Antenna Corrosion is a QST article published in 1993 that helps on antenna maintenance works

The _Nomenclature Française_ offers an online callbook service specifically for French amateur radio operators and SWLs. This resource facilitates searching for stations by various criteria, including callsign, operator name, city, and postal code. Search results typically display the operator's identity, full address, email contact, and personal website link, if available and publicly listed. The platform serves as a central database for the French amateur radio community, maintained by the _REF Union_. It provides a direct mechanism for operators to request modifications or new insertions of their data into the online nomenclature, ensuring current and accurate listings. The service is a fundamental tool for QSLing, locating fellow hams, and verifying contact information within France. Authored by _F6BIG_, the callbook is a key utility for French hams.

HF Linear Amplifiers, maker of the HAL600 Atlantic atomatic HF Amplifier

German ham radio portal

The document explains the technical aspects of how the Internet Radio Linking Project (IRLP) works, focusing on the use of VoIP streaming software under the Linux operating system. It details the audio sampling, compression, transmission, reception, and playback processes involved in IRLP communication.

Full color QSL printer in Poland

Liga Puertorriquesa de Radioaficionados - KP4E

Review of the Retevis RT95 also marketed as Anytone AT-778UV dual band VHF UHF FM mobile radio transceiver

WEB site of UT5UGR Dimitry

The 160-meter amateur radio band, spanning 1.8 to 2 MHz, was historically the lowest frequency amateur allocation until the introduction of the 630-meter and 2200-meter bands. ITU Region 1 allocates 1.81–2 MHz, while other regions use 1.8–2 MHz. This band, often called "Top Band" or "Gentleman's Band," was established by the International Radiotelegraph Conference in Washington, D.C., on October 4, 1927, with an initial allocation of 1.715–2 MHz. Effective operation on 160 meters presents significant challenges due to the large antenna sizes required; a quarter-wavelength monopole is over 130 feet, and horizontal dipoles need similar heights. Propagation is typically local during the day, but long-distance contacts are common at night, especially around sunrise and sunset, and during solar minimums. The band experienced a resurgence after the LORAN-A system was phased out in North America in December 1980, leading to the removal of power restrictions.

Portable heavy-duty gas generators

Official Yaesu FT-920 Specifications and options

Reviews of two types of poles used on portable operation to support wire antenna and accessories to plant poles in the ground by N4KGL

A copper J Antenna for 144 and 430 article with design, feeding methods and pictures

Kenwood TS-590S QST review comments and table comparison vs Elecraft K3

Fine tuning your Multiband Hustler Vertical

Jefferson Amateur Radio Club JARC was originally founded in 1956. We're located just outside of New Orleans, Louisiana in the suburb of Metairie

Yaesu FT-450 Reviews at eham

Constructing a compact directional antenna for the 17-meter band, this resource details the build process for a Moxon rectangle, a two-element Yagi variant with folded-back elements. It covers the antenna's evolution from the _VK2ABQ beam_ and provides specific dimensions for a version built using fishing pole whips. The content includes a discussion of the antenna's radiation pattern, feedpoint impedance, and its inherent front-to-back ratio, which is often superior to a standard two-element Yagi. Practical considerations for element spacing and material choices are also addressed, alongside a visual representation of the antenna's physical layout. Performance data presented includes a comparison showing the Moxon rectangle's **2.5 dB gain** over a half-wave dipole and a front-to-back ratio of **20 dB**. The resource also touches upon the antenna's relatively wide bandwidth for a two-element beam and its suitability for portable operations due to its compact footprint. It offers insights into optimizing the design for specific operating conditions and discusses the advantages of its lower take-off angle compared to omnidirectional wire antennas, making it effective for DX contacts on the 17-meter band.

A 40 meter QRP - Transceiver by DL5NEG

How do two-wire reversible direction Beverages work, an excellent document that explains fundamentals of beverage antennas. This article details the design and performance of a reversible beverage antenna. Leveraging orthogonality between common mode and differential mode currents on a 2-wire line, this antenna facilitates independent reception from both ends. While common mode signals arrive and are summed on a transformer's secondary for common mode reception, differential mode signals induce anti-phase currents, providing individual reception. Various measurements explore impedance, transmission loss, and F/B ratio, highlighting the antenna's effectiveness and areas for improvement. Notably, increasing the antenna's height significantly improved performance.

Debco electronics, inc. - computers and electronic components for business, developers and hobbyists

Kingsport Amateur Radio Club / Bays Mountain Radio Club , Serving Tri-Cities TN/VA Area, Useful Technical Links, Club Photos

Middle East Tennessee Emergency Radio Service

The BTech DMR-6X2 dual-band DMR handheld radio is thoroughly reviewed, detailing its features and performance for amateur radio operators. This resource covers the radio's capabilities for both VHF and UHF frequencies, supporting Tier II DMR digital and FM analog modes. It highlights key specifications such as its **136-174 MHz** and **400-480 MHz** frequency ranges, CTCSS/DCS, DTMF, 2-TONE, and 5-TONE signaling, and its _digital simplex repeater_ function. The review provides a comprehensive unboxing experience, listing included accessories like two Li-Ion batteries (2100 and 3100 mAh), a programming cable, and a 37-page English user guide. It also specifies the radio's physical dimensions of 5.1 x 2.4 x 1.5 inches and weights of 9.9 oz with the 2100 mAh battery and 10.8 oz with the 3100 mAh battery, offering practical insights for hams considering this transceiver.

A shielded broadband (~200 MHz) active loop antenna offers more quiet and relatively less interference reception.

Article on a QRSS receiver for 30 meters band