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277 links - and 2 categories

Antennas : 160M
  • 160 meter antenna problems and solutions - The quarter-wave Marconi working against ground is a popular and inexpensive antenna for 160 meters. A lot of newcomers to the band favor this simple antenna because it's easy to put up, it isn't too big, and it works.
    [ Hits: 107 | Votes: 0 | Rating: 0 ]
Antennas : 4M Antennas : 80M
  • 80m Inverted-L 12m Spiderpole - An Inverted-L with its long leg sloping to the ground. It will still work very good, even if the horizontal wire has to be sloped diagonally to the ground, as long as you have enough horizontal space to keep it at about a 45 degree angle or more from the pole.
    [ Hits: 147 | Votes: 0 | Rating: 0 ]
Antennas : Antenna Calculators
  • Corned Fed Delta Loop - Author found a ratio between the lengths of the sides of the Delta Loop that give reasonably low SWR into a 50 ohm coaxial cable almost independent of the high above ground and other surroundings. This ratio also gives good results no matter orientation. Includes an online delta loop antenna calculator.
    [ Hits: 167 | Votes: 0 | Rating: 0 ]
Antennas : Beverage Antennas : Delta loop
  • 160m Inverted Delta Loop - This 160 meter Delta Loop antenna is made of Hard drawn copper wire AWG 10, the two upper side are 148.5 foot each base wire is 240.9 foot, the feed point at 30.69 foot to one corner, feed with 450 Homs balanced line to an antenna tuner on the ground, then with 50 homs coax to the shack.
    [ Hits: 112 | Votes: 0 | Rating: 0 ]
Antennas : Receiving
  • The Loop on Ground Antenna - An experimental antenna for HF reception. It consists of a single loop element mounted on the ground. It is stealthy, small, and quiet. EZ-NEC plots and on-air test results are included.
    [ Hits: 299 | Votes: 3 | Rating: 8 ]
  • HF Receive Antenna - This page describes a couple of parts box medicine bottle antennas that you can build. The ground side of the capacitor is soldered to the ground of the BNC connector. The positive side of the capacitor takes 5 turns around the toroid and is soldered back to itself. The center pin of the BNC connector takes 5 turns around the toroid and then continues on to the wire wound inductor. From there the antenna continues with an attached piece of wire.
    [ Hits: 189 | Votes: 2 | Rating: 3 ]
Antennas : Rhombic
  • K0UO Rhombix Antenna Farm The Ground - Modeling an antenna over real terrain gives you a visual picture of how terrain impacts performance. You can use a model to determine optimum height for antennas on an existing tower, Compare different tower locations for performance, Compare different sites for performance
    [ Hits: 143 | Votes: 1 | Rating: 10 ]
Antennas : Theory
  • The Weird Antenna Wire End Effect - A half wave wire that is tuned for resonance on 80m will NOT be resonant on 40m despite a precise harmonic relationship between the two bands. The End Effect is caused by a capacitive coupling between an unterminated wire end and the ground.
    [ Hits: 92 | Votes: 0 | Rating: 0 ]
Antennas : Vertical DX Resources : QSLing : QSL Galleries
  • Pirate QSL Collection - A QSL Cards collection divided into North American Shortwave Pirate Radio QSLs abd European Shortwave Pirate Radio QSLs
    [ Hits: 118 | Votes: 0 | Rating: 0 ]
Internet and Radio : WebSDR
  • Websdr Polska - RSP1A receiver with LoG (Loop On Ground) antenna in quiet QTH - southeastern Poland. Very low QRM!
    [ Hits: 89 | Votes: 2 | Rating: 2.5 ]
Manufacturers : Software Defined Radio
  • SDR4Space - Software Defined Radio for Space Applications produces ground stations for uplink and downlink, Rotator computer controller with USB and CANbus Interface, USB Converters
    [ Hits: 145 | Votes: 0 | Rating: 0 ]
Shortwave Radio : Numbers stations
  • Spy Numbers Stations - Spy Numbers Stations are shortwave radio stations that are speculated to have been broadcasting since World War I. The true origin and purpose of them are unknown. A popular theory is that these stations are intended for spies in the field using a One Time Pad. Another theory is that they are used in drug smuggling operations.
    [ Hits: 173 | Votes: 0 | Rating: 0 ]
Technical Reference : RF Design
  • Signal to Noise Ratio SNR - Signal to Noise Ratio, definition and application to Radio Communications. Signal to Noise Ratio (SNR) is a figure of merit that compares the level of a desired signal to the level of background noise.
    [ Hits: 132 | Votes: 5 | Rating: 8.4 ]
Technical Reference : RF Safety
  • RF Exposure Calculator - To use the RF Exposure Calculator, fill-in the form with your operating power, antenna gain, and the operating frequency. Depending on how far above ground the RF source is located, you might want to consider ground reflections too.
    [ Hits: 100 | Votes: 0 | Rating: 0 ]
Technical Reference : Radio Frequency Interference
  • Stop RFI from Solar PV Systems - Stop EMI RFI Interference in Off Grid Solar PV Systems, in this article the author provides hints on tracking down the EMI or RFI source, shielding and grounding in order to eliminate interferences on the whole HF and VHF ham radio bands
    [ Hits: 80 | Votes: 0 | Rating: 0 ]
Technical Reference : Sound Card Radio Interfacing
  • Digital Mode Interface - The use of an isolation interface between the radio and the pc is higly recommended,in order to avoid the problems that could be caused from ground loops. This project includes schematic and assembly instructions
    [ Hits: 174 | Votes: 0 | Rating: 0 ]
Technical Reference : Test Equipment : RF Probe
  • A Simple Field Strength Meter - Mad your own simple FS meter. It is the simplest thing to make and is good enough to see if the antenna under test is radiating more power than your old ground plane, old mobile vertical or just radiating at all in a particular direction or in all directions.
    [ Hits: 158 | Votes: 0 | Rating: 0 ]

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