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Eham article by Vince Waelti (K9TSU) -
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Transferring Radio Frequency Energy from Your Transmitter to Your Antenna by Don Keith N4KC -
Plans for building your own 3-element beam for use on 6m. -
A Yagi-Mag antenna for the 4 meters band with NEC and MMANA files plans and pictures -
Installing the Cumbria Designs X-Lock VFO Stabilizer, and Improving The TR7 Audio Quality -
Measuring the output impedance (Zs) of solid-state broadband HF amplifiers operating in class AB eham article by ZS6BIM -
Jose B Rivera, N2LRB, shares his initial experiences with the Icom IC-7300, recounting a shift from skepticism to appreciation for the transceiver. He details how the radio's impressive Sherwood Engineering test results, ranking it #12, significantly influenced his decision, especially considering its competitive price point against higher-end options like the Elecraft K3s. The review highlights the IC-7300's strong receive capabilities, a key factor in N2LRB's purchasing decision, and notes the advantages of its SDR architecture for future updates. He describes the straightforward setup process, from unboxing and connecting PowerPole connectors to making a first contact with N0HQ, a special event station. N2LRB expresses satisfaction with the radio's clear audio and ease of tuning, even if the pan-adapter's utility for his operating style remains to be fully explored. He concludes that the IC-7300 offers exceptional value, providing SDR features and receive performance comparable to more expensive rigs at half the cost. -
This Antenna project is a bit more complex than other omni antennas for satellite use, but it is much easier and cheaper than a standard tower mounted circular polarized azimuth and elevation rotating beam system. -
A simple Drake R-4C receiver power supply modification -
The cable testing approaches discussed in this article gives an idea about the electrical characteristics of a coaxial cable. Velocity of Propagation, Characteristics Impedance, Return Loss Measurement and more -
A summary, overview or tutorial covering the basics of Meteor Scatter or Meteor Burst Communications, a form of radio signal propagation often used at VHF. -
Near Vertical Incidence Skywave propagation is a form of radio wave propagation used on the MF and HF bands to provide radio communications and broadcasting coverage over short distances, especially where the terrain contains obstacles. -
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The details of the spark gap transmitter and its history: how it was invented, developed and used. -
All the essentials about the Dip Meter or Grid Dip Oscillator used for many RF measurements including detecting resonance, locating RF emissions, and making many RF measurements. -
Interesting article on how Marc Van Stralen, PA1HFO, took the Drake TR-7 Transceiver to the Next Level. -
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Identifying The Drake TR-7 Differences and Versions -
A complete list of resources for the Kenwood TS-850 mantained by TK5EP -
AmTOR may be considered as the next development from RTTY. AmTOR was introduced to overcome the problems with RTTY. As a result of its performance, it has become popular on the HF bands because it gives more reliable communication, especially when interference is present. It achieves this by using a coding system that allows errors to be detected and corrected. -
Drake TR-7 A.M. Transmit Filter Modification -
A modified Hairpin antenna for a wider bandwidth an mounted on a grounded metalic mast -
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LDE articles and reports about long delayes radio echoes by DF5AI -
An overview about the UHF connectors often referred to as the PL259 plug and SO239 socket used for many RF applications. Limitations, history and soldering properly UHF Connectors -
A resource page for Kendoowd TS-850 HF transceiver -
A fand dipole antenna home made for the 7,14,50 MHz. This article descbribes how to homebrew the antenna, hot to setup and some SWR measurements. -
Tips and tricks for CW contesting by KH2D -
Article descrive the different types including coax and open-wire feeder and waveguide. -
A comparison of commercial 4m verticals by by Ian Hogan G6TGO -
Key details about the superhet or superheterodyne radio reeiver: basic overview; how it works; applications; design notes, all you need to know. -
Togo DXpedition 5V7TT 10th-23rd October 2010 -
Article cover hints and tips on ham radio or amateur radio contesting and contests -
Ham or amateur radio is a fascinating hobby for all -
A Practical, 5-Band Homebrew Wire Beam the Upside-Down Umbrella -
The problem with making your own trapped HF antennas is usually getting the coaxial traps tuned to frequency. This article explains a method using a RF signal generator at +10dBm output into the coaxial trap. -
An article on how to measure electrical current with a digital multimeter or analogue multimeter. -
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. -
Read all the key details about Vacuum Tubes or Thermionic Valves that provided the foundations for today's electronics technology. -
How test transistors and diodes with a simple digital multimeter. -
Common mode currents are those currents that flow in the same direction on a wire bundle, as opposed to the currents that flow -
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The antenna ground or earth system can be key to its operation whilst also being a key safety feature. This article is about grounding systems for antennas, covering different aspects of grounds made for antenna safety, or expressly for lightning or just to improve antenna performance, being ground an antenna component. -
A four position HF antenna switch with PC control -
Useful Function for the Drake TR-7(A) \"Store\" Switch Add A Transmit Key Function -
Tim Kirby G4VXE gets a first look at the much-heralded FTdx101 from Yaesu.
