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217 links - and 4 categories

DX Resources : Beacons : Beacon Monitoring
  • NCDXF Beacons Transmission Schedule - Whatch at beacons transmitting in real time. This page contains a self refreshing table that displays every 10 seconds the current transmission schedule of the international beacon project. Tune your radio and check the beacon you are hearing.
    [ Hits: 323 | Votes: 0 | Rating: 0 ]
Ham Radio : Clubs : North America : USA : Utah
  • W7SP Utah Amateur Radio Club - Our club is the oldest and largest amateur radio club in the state of Utah. It holds the call W7SP, a memorial call for Leonard (Zim) Zimmerman, early UARC member and radio pioneer
    [ Hits: 197 | Votes: 0 | Rating: 0 ]
Operating Aids : History : Marconi
  • The very first DX - December 12th, 1901 is certainly a date with a historical relevance in radio transmissions. At 04.30 GMT of that day, Guglielmo Marconi succeeds in sending the first transatlantic wireless communication.
    [ Hits: 309 | Votes: 2 | Rating: 9 ]
Operating Modes : NBEMS
  • Introduction to NBEMS - A presentation of the NBEMS and the importance of data transmission in Digital EmComm.
    [ Hits: 653 | Votes: 0 | Rating: 0 ]
Propagation : Sunspots
  • Sunspot Index and Long-term Solar Observations - The Solar Influences Data analysis Center SIDC is a department of the Royal Observatory of Belgium and its mission is to preserve, develop and diffuse the knowledge of the long-term variations of solar activity.
    [ Hits: 141 | Votes: 0 | Rating: 0 ]
Radio Equipment : HF Amplifiers : Acom 1000
  • Mod for Acom 1000 amplifier - The problem originates by improper TXOUT-to-RF timing (RF transmission exists still after a TX-EN prohibition), combined by too long decay of their CW pulses.
    [ Hits: 509 | Votes: 0 | Rating: 0 ]
Shortwave Radio : Numbers stations
  • Priyom Number Stations - Number stations are shortwave transmissions from foreign intelligence agencies to spies in the field of foreign countries.
    [ Hits: 278 | Votes: 0 | Rating: 0 ]
  • Decoding West Germany Numbers - A simplified explanation of decoding West German numbers messages transmissions without a computer.
    [ Hits: 394 | Votes: 0 | Rating: 0 ]
  • ENIGMA 2000 - ENIGMA 2000 is a UK based online group, whose aims are to bring together listeners and enthusiasts who monitor and gather information on Number Stations and other related radio transmissions.
    [ Hits: 425 | Votes: 1 | Rating: 10 ]
  • Decoding Numbers Stations - QST Article - Exploring these mysterious transmissions and how their strong following has created a niche in the community. Free article in PDF Format from QST November 2019
    [ Hits: 512 | Votes: 0 | Rating: 0 ]
Software : Circuit Design
  • FT CALC 1.3 - Ferrite Toroidal Core HF Calculator - This EXCEL Program Worksheet calculates the safe operating conditons for a toroidal transformer operating between 1 and 50 MHz. Manufacturer data for complex permeability, magnetic dimensions, and saturation flux density must be available. Some core types which are commonly used in amateur transmission are included. The program produces limiting winding voltages for linear operation and temperature rise over the range of frequencies and power specified.
    [ Hits: 283 | Votes: 1 | Rating: 2 ]
Software : Macintosh
  • JTDX - JTDX (JT Digital Modes for Linux, MacOS and Windows) is a free, open-source software for amateur radio operators for the reception and transmission of digital modes, including JT65, JT9, and FT8, among others. JTDX is designed to provide improved decoding of weak signals and better usability compared to other digital mode software like WSJT-X. It also has features like a real-time spectrum display, logging, and decoded message storage and retrieval. Download JTDX from the official site.
    [ Hits: 3266 | Votes: 6 | Rating: 8.17 ]
Software : Weak Signal
  • MSHV - MSHV is a free windows and linux multimode software that support weak signal digital modes like MSK144 MSKMS JTMS FSK441 FSK315 ISCAT JT6M FT8 FT4 JT65 PI4 amateur radio modes. MSHV features several interesting features including the Multi Answering Auto Seq Protocol, allowing multiple signal transmissions to be used during dx peditions.
    [ Hits: 1323 | Votes: 6 | Rating: 8.5 ]
Technical Reference : Coax Cables and Connectors : Testing Coax Cables
  • Measure Impedence of Coax Cables - This video shows one way to use a scope and function generator to measure the length of a piece of coax transmission line as well as estimate its impedance
    [ Hits: 1091 | Votes: 3 | Rating: 6.67 ]
Technical Reference : Radio Frequency Interference
  • Ham Radio TVI in the 21st Century - Ham radio transmissions can interfere with television reception. This is called television interference, or ham radio TVI. Consumer adoption of cable television has significantly reduced ham radio TVI. But the introduction of IPTV, or television over phone systems, has brought ham radio TVI back, often with a vengeance. Here's why
    [ Hits: 322 | Votes: 0 | Rating: 0 ]
  • How to locate RFI - I have RFI, now what– Locating it. This article is the first of a three parts article, that covers the problem of locating the RFI source. Author make use of an SDR receiver to locate RFI emissions. Ai interesting RFI location process diagrams helps on following the various phases, permitting the discovery of almost 75% of the RFI issues.
    [ Hits: 194 | Votes: 2 | Rating: 10 ]
Technical Reference : Receivers
  • MiniTioune receiver project - The MiniTioune receiver project, developed by Jean-Pierre F6DZP, consists of the home constructed MiniTiouner hardware which interfaces via a standard USB 2.0 port to a Windows PC running the MiniTioune software. It can be used to receive satellite broadcasts transmissions making it ideal for use on Q-oscar 100 Es hail-2 without any external frequency converters.
    [ Hits: 197 | Votes: 0 | Rating: 0 ]
Technical Reference : Standing Wave Ratio
  • What is SWR - standing-wave ratio - Article about Standing-wave ratio (SWR) defined as a mathematical expression of the non-uniformity of an electromagnetic field on a transmission line. SWR is the ratio of the maximum radio-frequency (RF) voltage to the minimum RF voltage along the line.
    [ Hits: 190 | Votes: 0 | Rating: 0 ]
Technical Reference : TVI Filters Technical Reference : Test Equipment
  • Dip Meter - Grid Dip Oscillator GDO - 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.
    [ Hits: 378 | Votes: 0 | Rating: 0 ]

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