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Antennas : Baluns
  • Build your own HF balun - A balun is a MUST for dipoles or similar antennas when they are feed with coaxial cable. From the RF point of view, the shield can be modeled as two conductors, the internal shield (the real shield, this is, ground) and the external shield, who is really far to be ground. In this way, your dipole has 3 arms, the two from the dipole and the coaxial cable shield (external face)
    [ Hits: 248 | Votes: 1 | Rating: 10 ]
Antennas : Fan Dipole
  • Modeling an 80/40/20M Fan Dipole for DX - An interesting presentation of a real multiband Fan Dipole antenna, optimized for better DX operation performances, considering the terrain, position, DX destination path and other influencing factors
    [ Hits: 532 | Votes: 2 | Rating: 5.5 ]
Antennas : Receiving
  • 160 Meters 4 Square Receive Antenna - A four square array receiving antena for the top band, performance is extremely directional and space requirements are really hard to fulfill.
    [ Hits: 178 | Votes: 1 | Rating: 10 ]
Antennas : Vertical
  • Field Day Vertical Antenna by KN5L - This Field Day Vertical Antenna project is the result of many years of attending various field day sites and realizing that what was needed is a simple, easy to assemble vertical antenna. The design of this Field Day Antenna is not very novel and leverages ideas from Butternut verticals and ARRL publications. The one essential requirement was that the antenna can be raised by just one person. The design of this Field Day Antenna is an above ground mounted ground plane vertical.
    [ Hits: 213 | Votes: 3 | Rating: 7 ]
DX Resources : Clusters
  • S50CLX Live DX Cluster - Get DX spots from S50CLX Live DX Cluster in real time on your device showing all the current and recents Amateur Radio spots on all bands and modes.
    [ Hits: 131 | Votes: 0 | Rating: 0 ]
DX Resources : Contest : Contest Results
  • Contest.RUN - Contest.RUN allows radio amateurs from around the world to follow the competition in real time. You can track the competitors positions as soon as the data is received by the server.
    [ Hits: 87 | Votes: 1 | Rating: 8 ]
DX Resources : QSLing
  • OQRS Hints and Tips Explained - Useful hints and tips on using the OQRS service. How to use the log search and check the OQRS Status, the band activity module explaoined, the real time log search feature and the whole OQRS process step by step
    [ Hits: 170 | Votes: 0 | Rating: 0 ]
Ham Radio : Demographics
  • Ham Census - What do amateur radio operators worldwide, think of their passion? What do we wish for? What are we frustrated about? How many of us are active, versus those that are taking a break? Do we have favorite radios, antennas, or even favorite cw paddles? Do we prefer one contest over another? The best way to find out is if we all participate in Ham Census. Join in and let all amateur radio operators know your thoughts "share your views" then you can find out what everyone else is thinking, in real time. Help shape the future of ham radio by participating in the world's most complete survey of amateur radio.
    [ Hits: 105 | Votes: 2 | Rating: 8 ]
Manufacturers : Software Defined Radio
  • Silphase Technologies - Amateur radio SDR Receiver and Transceiver manufacturer , makers of the Silphase R1 an innovative HF receiver with high performance real-time spectrum scope.
    [ Hits: 131 | Votes: 0 | Rating: 0 ]
Operating Modes : APRS
  • APRS Direct - Realtime APRS tracking data - APRS Direct is a website that brings you global real-time APRS tracking and weather data (including CWOP). Our goal is to bring you a fast and easy-to-use map with the latest APRS activity.
    [ Hits: 278 | Votes: 6 | Rating: 8.5 ]
Operating Modes : Satellites : Weather Satellite
  • Decoding Russian Meteor-M2 satellite images in real time - The Meteor-M N2 is a polar orbiting Russian weather satellite that was launched on July 8, 2014. Its main missions are weather forecasting, climate change monitoring, sea water monitoring/forecasting and space weather analysis/prediction. Meteor-M N2 transmits images using the digital LRPT protocol at around 137.1 MHz with can be received with an RTL-SDR.
    [ Hits: 199 | Votes: 0 | Rating: 0 ]
Propagation : MUF Indicators
  • Real-time ionogram - This page displays the current ionogram and tries to determine the nearest digisonde report to your location. Data coming from this sondes are used to determine the MUF for oblique propagation on HF spectrum
    [ Hits: 264 | Votes: 0 | Rating: 0 ]
Propagation : Observatories
  • Global Ionosphere Radio Observatory - In cooperation with the URSI Ionosonde Network Advisory Group (INAG), the LGDC promotes cooperative agreements with the ionosonde observatories of the world to accept and process real-time data of HF radio monitoring of the ionosphere, and to promote a variety of investigations that benefit from the global-scale, prompt, detailed, and accurate descriptions of the ionospheric variability.
    [ Hits: 124 | Votes: 0 | Rating: 0 ]
Radio Equipment : HF Transceivers : Icom IC-7300
  • IC-7300 Quick Start Guide - PDF document for IC-7300 beginners. The ICOM IC-7300 is an HF + 6 meter, multi-mode, self-contained Software Defined Radio (SDR) transceiver with knobs, buttons and a touch screen. It also has a real-time spectrum display with pan adapter and water fall displays.
    [ Hits: 683 | Votes: 2 | Rating: 8 ]
Radio Equipment : HF Transceivers : Kenwood TS-590S
  • TS-590S audio noise - With high impedance earphones plugged into the audio jack on the Kenwood TS-590S or TS-590SG, you can hear a really annoying noise even with the AF volume set to zero. A simple quick-and-dirty solution is a resistor in series to the audio output.
    [ Hits: 130 | Votes: 1 | Rating: 9 ]
Shortwave Radio : Numbers stations
  • How to Listen to Real Spy Broadcasts - Encrypted messages, fancy technology, spies use them all to communicate, but sometimes the best way to hide is in plain sight. Right now, broadcasting across the airwaves around the world, are automated, anonymous shortwave AM radio stations that most governments won't acknowledge even exist, much less explain
    [ Hits: 243 | Votes: 1 | Rating: 1 ]
Software : Aircraft scatter
  • AirScout - Software for Aircraft Scatter Prediction. Extend your capabilities on VHF-/UHF-SHF bands even when you live in an unprivileged location and Calculate a propagation path between two stations and follow the aircrafts in real time
    [ Hits: 295 | Votes: 2 | Rating: 5.5 ]
Software : Satellite tracking
  • JSatTrak - Satellite tracking program - JSatTrak is a Satellite tracking program written in Java. It allows you to predict the position of any satellite in real time or in the past or future. It uses advanced SGP4/SDP4 algorithms developed by NASA/NORAD or customizable high precision solvers to propagate satellite orbits.
    [ Hits: 504 | Votes: 1 | Rating: 10 ]
Software : Signal Generator
  • AF signal function generator for Windows - Windows signal function generator sotfware, offers 4 main channels, 4 modulators, 1 measurement generator, 1 frequency standard generator, Amplitude, phase and frequency modulation, can generates real band-limited signals
    [ Hits: 611 | Votes: 4 | Rating: 3 ]
Technical Reference : Receivers
  • A 3.5MHz Receiver for SSB and CW - Homemade receiver for 80 meters band. The receiver works very well (in fact better than some of its successors), especially the AGC makes listening to 80m QSOs a real pleasure. Sensitivity is not cutting-edge, but on a full-size short-wave antenna it is by fare sensitive enough.
    [ Hits: 248 | Votes: 2 | Rating: 6.5 ]

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