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DX resources by SV1CNS

Official web site of the yt9x contest team Radio Club "Sevojno" - YT9X Contest Team

28,227.5 MHz, from JN55VF first "IW" prefix beacon "ON THE AIR" activated from Italy

The Tri-pole antenna, a clever modification of a standard dipole, allows for dual-band operation by integrating a third element. This design effectively shortens the overall dipole length by 10 to 20 percent, simplifying antenna rotation and offering a compact footprint. KK4OBI's article delves into the operational principles, using a 6 and 10-meter Tri-pole as a primary example, and provides comprehensive instructions for constructing any Tri-pole antenna within the 6 to 15-meter range. Key to the Tri-pole's performance is its off-center feed, necessitating a common mode choke at the feed point for optimal tuning and reduced noise. The author outlines a methodical approach to determining element dimensions, starting with a vertical element frequency calculated as 0.47 times the sum of the desired upper and lower band frequencies. This calculation, along with K-values derived from trend lines, guides the initial lengths for the horizontal arms, demonstrating how a 10m-6m Tri-pole can achieve a total horizontal length 78% shorter than a conventional 10-meter dipole. Tuning and balancing are critical, with the article detailing adjustments to arm lengths and the vertical element to achieve balanced SWR values, as validated through 4NEC2 simulations. Radiation patterns are analyzed at various elevations, showing gains around 5.7 dBi and favorable take-off angles for DX contacts. Construction details specify aluminum tubing dimensions, U-bolts, and an SO-239 connector, emphasizing the importance of a ferrite-based choke for wideband operation.

TX on 28.289MHz since 1992

Stacking yagi antennas for 50 Mhz band article by by Zaba, OH1ZAA/NN0Y

An article by CT1BOH about recording amateur radio contests. Recording contests is a great tool to detect problems and improve operating efficiency

The **Luis Trenker Award** is an amateur radio operating award established by the Amateur Radio Club Ladinia to honor the director and author Luis Trenker from Val Gardena, South Tyrol, Italy. To qualify for the award, HF stations must achieve five confirmed QSOs with each of five specific Alpine countries: Italy (with specific prefixes like I1, IK1, I2, I3, IN3, IW3, IV3), France, Germany (with DOKs A, C, T, U), Switzerland or Liechtenstein, and Austria (with prefixes OE2, OE3, OE6, OE7, OE8, OE9). A single QSO with a member of the Amateur Radio Club Ladinia can substitute for the five required Italian QSOs, with members' QSL cards bearing a special rubber stamp. VHF/UHF stations have a simpler requirement, needing only one confirmed QSO with each of the five Alpine countries. SWL stations are eligible under the same conditions as transmitting stations. All contacts must be valid after April 12, 1990. Applicants must submit a list of contacts, certified by two OMs or a club, to the Amateur Radio Club Ladinia in Ortisei, South Tyrol, Italy. The award manager is IN3PGS Karlheinz, and the club official is IW3AQL Luca.

Project by N9SSA

TX on 28.265 from Pimento, IN

Demonstrates the practical application of APRS (Automatic Packet Reporting System) through the lens of HB9PVI's activities in Switzerland. It covers the system's core function of reporting geographical positions and telemetry data from various objects, including mobile stations, aircraft, and the ISS, distributed via packet radio and internet gateways. The resource highlights the routing paradigm shift introduced in April 2005, specifically the recommendation to use _WIDE1-1_ instead of RELAY and WIDE for digipeating to reduce duplicate packets. The page presents real-time maps displaying the positions of amateur radio stations in Switzerland and around Bern, updated every few minutes. It details specific callsigns like _HB9BA-2_ (HB9PVI's home QTH), _HB9BA-8_ (a weather station), and _HB9BA-4_ (a WIDE digipeater on Weissenstein mountain), providing context for their roles within the local APRS network. Links to track HB9PVI's mobile operations (_HB9PVI-9_) and handheld devices (_HB9PVI-15_, _HB9PVI-7_) are also provided. Furthermore, the resource curates a list of APRS software options for various operating systems, including _JavAPRS_ for Europe, _UI-view_, and _X-Astir_ for Linux, alongside digipeater/IGATE software like _DiXPRS_. It also offers downloadable APRS information, including a PDF article by HB9PVI and HE9ZGN, and a PowerPoint presentation in German, making it a repository of practical and historical APRS data.

The Chelsea Amateur Radio Club is based on service to the community and the advancement of Amateur Radio in Southeast Michigan.

Serving Hardin County Since 1969

Special Service Club

This resistor calculation tool shows which combinations of two resistors, series or parallel, gives a match better than the closest standard value.

SV1GRB's Homepage, photos from dx-peditions and useful links

Where abilities and disabilities become possibilities

Homepage of the belgian hamstation ON1DRS

A page with several testing and measurement resources usefull for those ham radio operators who needs to align or repair their own radio equipment.

Dxpedition to gabo island, australia, sept 2001 OC-196, ARLHS# aus-078, WLH No: 1031

The North Shore Amateur Radio Club, Branch 29 of the New Zealand Association of Radio Transmitters (NZART) is an incorporated society for Radio Amateurs and interested persons.

An article on origin and usage of the Decibel, that has always been a logarithmically based representation of a power ratio

Rick gryder's ham radio page is the page showing equipment and links to sites in amateur radio, as well as my interest in lighthouses and the sea.

28 Dec 05 - 4 Jan 06 Grand Cayman IOTA: NA 016 GL: EK99, Jamaica IOTA: NA097 GL: FK17

Ham Operator since 1960

Outlines the Club de Radio Amateur de Charlevoix (VE2CCR), a regional amateur radio organization serving the Charlevoix area in Quebec, Canada. The resource details the club's objectives, which include promoting amateur radio, fostering technical knowledge among members, and supporting emergency communications. It lists various club activities such as regular meetings, field day participation, and local repeater maintenance. The site provides contact information for prospective members and details on how to join the club, including membership fees and application procedures. Information on the club's repeaters, including frequencies and access tones, is also presented, facilitating local amateur radio operations. The resource serves as a central hub for VE2CCR members and interested individuals seeking to engage with the amateur radio community in Charlevoix.

Fort Knox Amateur Radio Club Kentucky USA

OL5Z - contest station from JN89AR

Scandinavian Young Ladies Radio Amateurs - YL club

BARA is an ARRL affiliated club in Barry County, Michigan, which is located in the southwestern part of the Lower Peninsula.

Ham radio page from Brazil with many info on amateur radio in portuguese.

Some images received by PY4BL

CB station AP from Lieksa Finland

Station notes, personal informations and some links

The ICOM IC 7600 transceiver as successor of the IC 756 Pro3, resource page with many links and resources to the Icom top line HF transceiver

28.222mhz transmitting with 2 watts of power

Basically, this antenna is a 23-foot wire fed through a 4:1 un-un transformer. This antenna can be easily used in portable operation, for operating all bands from 40-10 meters.

A web page devoted to the handicapped hams of the world.

Hawaii Emergency Amateur Radio Club

The Stu Rockafellow Amateur Radio Society was founded in 1960 and has been affiliated with the ARRL for 45 years.

Amateur radido station KB1HNZ operator Tim Watson, Gorham, Maine.

Entities First Worked from Hong Kong on 50MHz

LA3ZA Unofficial Guide to Elecraft K2 Modifications

NARL homepage, the namibian amateur radio league

Operating in a Single Operator Two Radios (SO2R) setup, especially with beverage antennas, often exposes the receiving radio's front-end to significant RF energy from the transmitting radio. This resource details a practical, homebrew receiver protection circuit designed to mitigate this risk. The core of the design involves a non-inductive 2W 22 Ohm carbon composition resistor in series with the RX antenna line, followed by two stacks of four fast-switching diodes (e.g., _1N914_) configured in opposite polarizations. This arrangement effectively clamps the incoming voltage to approximately 2.8 V peak-to-peak, safeguarding sensitive receiver input components. The series resistor plays a crucial role by absorbing excess power, preventing the diodes from exceeding their current ratings and potentially failing open, which would leave the receiver unprotected. The author, _N4KG_, measured up to 50 watts of coupled power between 80M slopers on the same tower, highlighting the necessity of such protection. The design is presented as a cost-effective solution to prevent damage to receiver input transformers, with the author noting successful protection of a receiver even after a resistor showed signs of overheating. This simple circuit can be integrated via a transverter plug, offering a robust defense against high RF input.