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Wikipedia page about collinear antenna arrays

Interactive great circles and QRA Locator map

ARRL Laboratory Expanded Test-Result Report Kenwood TS-2000 prepared by American Radio Relay League, Inc. Technical Department Laboratory in pdf format

Log Online for XT2TT in real time

An home made 70 cm colinear antenna at M1KTA blog

An online audio signal generator application capable to reproduce different waveforms with variable frequency range

I4FAF etrode Tube Linear Amplifier experience

Search the online log of VP8PJ DX pedition to South Orkney Feb. 21, 2020 - Mar. 6, 2020 Log search offered by M0URX.

A vertical linear loaded antenna for 2 meters band in italian

Constructing a linear focus parabolic antenna for WiFi operation involves precise metalwork, as detailed in this project. The author, AB9IL, shares a build that can be completed in a few hours, emphasizing the hands-on process of shaping and assembling metal components. This design aims to provide enhanced signal range for 2.4 GHz wireless networks, a common challenge in many ham shacks and home setups. The project outlines the practical steps required, from initial measurements to the final assembly, including cutting, bending, and bolting various metal parts. While specific gain figures are not provided, the parabolic design inherently offers significant _directional gain_ compared to omnidirectional antennas, making it suitable for point-to-point links or extending network coverage over distances. The construction process focuses on readily available materials and basic shop tools, aligning with the DIY spirit prevalent in amateur radio. This antenna project is presented as a straightforward build, requiring attention to detail in fabrication to achieve optimal performance.

Located in Mareeba, Australia.

K2HYD illustrate how to home made ladder line

VU2RAR basic VHF power amplifier suitable for 144-146 Mhz output power can vary from 3 to 25 Watts.

High-power 3-500 HF linear amplifier by Don Pinnock G3HVA

A greyline map that automatically refreshes every five minutes DX.QSL.NET

Displays map of the world, showing day and night areas.

Improvements to Using the Heath SB-200 Linear on Six Meters by Ron Klimas, WZ1V

Allow 9 bands and 1300 Watt output on the TL-922 amplifier with this document by PA0FRI

Interfacing tips for ICOM IC-706MKII transceiver with a Collins 30L-1 linear amplifier

On line shop for amateur radio, cb radio, marine, satellite and scanner supplies based in UK

Put up the longest dipole you can fit, feed it with open wire line, connect it to the balanced output of your tuner and poof! Instant multiband antenna. Is life really that simple?

The TU2T DXpedition log provides a critical resource for verifying contacts made during the 2011 operation from _Ivory Coast_. This online tool allows operators to quickly confirm their QSOs, which is essential for QSLing and award applications. Users can typically search by callsign, date, or band to locate specific entries, ensuring accuracy for their personal logbooks. Such online logs are indispensable for DXers pursuing awards like **DXCC**, as they offer immediate confirmation of rare or distant contacts. The ability to verify a QSO without waiting for a physical QSL card significantly streamlines the award application process. This particular log facilitates the confirmation of contacts with the TU2T operation, a highly sought-after entity.

Online calculator and construction instructions

An interesting article about co-linear or collinear antenna building, by Karl Shoemaker, AK2O

This article describes how to use a phone line as a shortwave receiving antenna, but be carefull telephone lines present a potential shock hazard, use at your own risk

This calculator computes the matched line loss for a transmission line using a model calibrated from data for the transmission line types built in to the calculator. It also gives an estimate of the mismatched loss if the mismatch is specified.

Understanding high-frequency (HF) skywave propagation is crucial for amateur radio operators seeking to optimize long-distance communications. This resource details the fundamental principles of HF radio propagation, including the properties of electromagnetic waves, the characteristics of various HF bands, and distinct propagation modes such as skywave, ground wave, and line-of-sight. It places significant emphasis on the ionosphere's pivotal role in refracting HF waves, explaining how solar activity directly influences ionospheric conditions and, consequently, propagation paths. The resource integrates real-time monitoring capabilities, featuring dynamic charts and data from DX clusters, WSPRnet, and the Reverse Beacon Network, which allow users to track current band activity and propagation conditions globally. It also delves into advanced topics like Near Vertical Incidence Skywave (NVIS) and gray line propagation, providing insights into ionosonde data and various propagation prediction models. The site presents a detailed analysis of solar-terrestrial interactions, geomagnetic indices, and space weather phenomena, illustrating their direct impact on HF communication reliability. Practical tools and applications are highlighted, including real-time QSO planners, online Maximum Usable Frequency (MUF) maps, and alerts for solar flares or geomagnetic storms. The guide systematically breaks down complex concepts into accessible chapters, offering a structured approach to learning about ionospheric regions, diurnal and seasonal effects, and the interpretation of propagation indicators like foF2, MUF, and Lowest Usable Frequency (LUF). This makes it a robust reference for hams aiming to deepen their technical understanding and improve operational effectiveness.

Onine Log for 9J2T DX Pedition

Proppy: Online HF propagation predictions using the ITU Recommendation P.533-13 Propagation Prediction Application.

S9DX log Online

True Ladder line and Wire antennas

A 400 W 144 MHz GI7b Linear amplifier

The CQ Callbook makes it easy to find QSL information from web-accessible sources like address and manager databases and country-specific callbooks. The search procedure is quite easy: just enter Callsign and click on the Search buttons.

The 60 Watt linear amplifier is simple all solid state circuit using power mosfet IRF840.

One popular rumor or thought is that antenna gain doubles every time we double the number of elements

Angle Linear has been producing GaAs FET preamplifiers since 1980

Lookup callsigns in locator, or locator of a specified callsign and display in google map

Online log for 5V7TT Togo dxpedition 2010. Offer QSL request service.

easily design your cable, pick connectors and cable, print drawing, get immediate quote and place order, all online.

Applying for a vanity callsign has become significantly streamlined, with the W5YI-VEC now facilitating online applications. This process allows hams to secure a personalized callsign from the FCC with remarkable efficiency, often seeing their new identifier granted in as little as **18 days**. The ease of access to this service represents a notable improvement for operators seeking a unique callsign. The resource outlines the straightforward steps involved, primarily directing users to input their current callsign to initiate the application. This direct approach simplifies what was once a more complex bureaucratic procedure, making it accessible to a broader range of amateur radio operators. For those interested in personalizing their on-air identity, the _W5YI-VEC_ online system offers a practical solution. It leverages digital platforms to expedite the application, reflecting modern advancements in administrative processes.

YAESU Distributor for Greece, Cushcraft, Maldol, Diamond, Surveilance and CCTV equipment

Enables users to convert plain text into _Morse Code_ and, conversely, decode Morse sequences back into readable text. This web-based utility provides a straightforward interface for rapid translation, proving useful for both learning and practical application. It processes input efficiently, displaying the corresponding Morse or text output instantly. Operators can leverage this tool for generating practice copy or for deciphering received CW signals, making it a handy resource for those honing their code skills. The translator handles various character inputs, converting them into standard International Morse Code elements. This simple utility supports quick lookups and real-time conversions, facilitating a better understanding of CW structure and timing. It operates entirely online, requiring no software installation.

5N7M Ivan from Abuja Nigeria online log

This Week's top news on amateur radio newsline

On Track On Line provides information about Rail Travel and all facets of the hobbies of railroading and trains.

Various publications through the years have shown how the SWR measured on a shorted (or open) feed line can be used to calculate feed line attenuation

Presents a construction project for a linear-loaded 40-meter rotatable dipole, detailing the design evolution from mid-element coils to 300-ohm twinlead loading. It covers material selection, including repurposed fishing poles and EMT conduit, and outlines the assembly process for the antenna elements and mounting plate. The resource provides specific measurements for element lengths and linear loading sections, along with SWR plots demonstrating the antenna's resonance at 7.035 MHz with a 1.1:1 SWR, and bandwidth up to 7.120 MHz below 2:1 SWR. The article documents the antenna's performance during various RTTY and CW contests, including the SARTG RTTY and SCC RTTY contests in August 2006, and the ARRL DX CW and CQWW WPX RTTY contests in February 2007. It reports successful operation at 500-1000W, noting improved performance after replacing a faulty coax cable. Specific DX contacts from British Columbia, including stations in Europe and South Africa, are listed, illustrating the antenna's capability despite its shortened length and relatively low height of 55 feet. The content highlights practical considerations such as weatherproofing the connections and supporting the fiberglass elements to prevent sagging. It also includes a brief comparison to an inverted-V at similar height and a ground-mounted vertical, noting the rotatable dipole's quieter reception. The author shares insights into the iterative design process and tuning adjustments made to achieve optimal resonance.

Online calculators for toroid coil, air-core coil inductance, XL, XC, and more.

Ballistic simulator "Orbit" allows the physical principles of the motion in the gravitational field of the Earth to be demonstrated and learned. You can calculate with this program the ballistic trajectories of the thrown bodies and orbits of spacecrafts and visualize the astroballistic situation on the flat map of the world and on the rotating globe in the real time

Novice Notes Online is Australia's top Internet site for beginners to amateur radio