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earth

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• The DC Isolated 1:1 Guanella - The DC Isolated 1:1 Guanella, transmission line transformer by N7ZWY
  [ Hits: 698 | Votes: 0 | Rating: 0 ]

• Eggbeater II Omni LEO Antennas - Presented here is a high-performance, circularly polarized omni-directional antenna that is easy to build, easy to tune, inexpensive, and will work all the mode J Low Earth Orbit (LEO) satellites
  [ Hits: 2904 | Votes: 2 | Rating: 8.5 ]
• Eggbeater II Omni LEO Antenna - Building Eggbeater II Omni low Earth orbit satellite Antennas for 70cm by ZR6AIC
  [ Hits: 1075 | Votes: 0 | Rating: 0 ]

• The Gamma Match - The gamma match was originally invented as a means of feeding vertical monopole antennas for medium wave broadcasts, which were earthed at the base for lightning protection- Hams are more likely to use a gamma match to feed a dipole or loop element, but the basic theory is easier to understand for the case of a quarter wave monopole.
  [ Hits: 957 | Votes: 2 | Rating: 4.5 ]

• Two Element Phased Verticals - Two 40 meter phased vertical antennas, project, pictures and description by W4NFR
  [ Hits: 1156 | Votes: 2 | Rating: 6 ]

• New York City Amateur Radio Emergency Communications Service NYC-ARECS - New York City Amateur Radio Emergency Communications Service (NYC-ARECS) is a NYC based auxiliary communications service. The organization is made up of amateur radio operators who are trained and dedicated to providing radio communications for governments, civil-preparedness and relief agencies during periods of local, regional, or national civil emergencies. This may include situations such as power failures, explosions, fires, floods, earthquakes or terrorist activities. NYC-ARECS is a participant in the NYC Office of Emergency Management (OEM) Partners in Preparedness program and a member of DHS FEMA's National Preparedness Coalition.
  [ Hits: 499 | Votes: 1 | Rating: 1 ]

• Great Circle Distance Calculator - This online calculator computes the great circle distance between two points on the earth's surface
  [ Hits: 1803 | Votes: 4 | Rating: 3 ]

• Getting started on 70cm E.M.E flier - Get involved with 70cm Earth Moon Earth communications it is easier than you think, EME promotional Flier
  [ Hits: 385 | Votes: 1 | Rating: 1 ]

• BikeCam G1OCN Dave - Live streaming video from G1OCN's motorcycle mobile webcam while he occasionaly drives his motor bike around the South coast of England, with google earth tracking map, APRS callsign G1OCN-10.
  [ Hits: 493 | Votes: 1 | Rating: 10 ]

• A multi-purpose portable setup - Working low-earth orbit satellites from any place
  [ Hits: 579 | Votes: 0 | Rating: 0 ]

• SuperDARN - An international Radar network for studying the Earth\'s upper atmosphere, ionosphere, and connection into space.
  [ Hits: 256 | Votes: 1 | Rating: 7 ]

• Cloud RF - Web VHF/UHF planning - Web based VHF-UHF RF planning powered by SPLAT! and Google Maps. Access via website, Android App or dynamic Google Earth interface.
  [ Hits: 1305 | Votes: 19 | Rating: 7.67 ]

• What the numbers mean in propagation - What the Numbers Mean, and Propagation Predictions--a brief introduction to propagation and the major factors affecting it.
  [ Hits: 480 | Votes: 0 | Rating: 0 ]

• ADIF to Map Amateur Ham Radio Contacts by K2DSL - This web application will read in a ham radio ADIF file produced by many logging programs and map contacts on a Google map. This simple tool converts also the log file into a KML file that can be easily downloaded and imported into Google Earth for a tridimensional view of your QSOs.
  [ Hits: 3683 | Votes: 9 | Rating: 8.55 ]

• CloudRF - Online radio planning system, allow you to generate accurate radio frequency predictions for anywhere on earth
  [ Hits: 9151 | Votes: 42 | Rating: 4.81 ]

• 4-1000A Tube RF Amplifier - Home Brew a 4-1000A RF power amplifier project by W4NFR
  [ Hits: 685 | Votes: 0 | Rating: 0 ]
• GS-35B Tube Amp - 160-10 Meters 1500 Watt Amp - W4NFR
  [ Hits: 577 | Votes: 2 | Rating: 9.5 ]
• 3-500Z Amplifier Project - This article loaded with nice pictures and schematics, describes a 160-10 meter linear amplifier that uses a pair of 3-500Z triode power tubes. It was designed and constructed by William Moneysmith, W4NFR. The amplifier features fast warm up and 1500-Watt RF output with 100-Watts of drive.
  [ Hits: 1082 | Votes: 4 | Rating: 9.5 ]

• 6m Power Amplifier - Home Brew 6 Meter Amplifier with a single 4CX250B by W4NFR
  [ Hits: 577 | Votes: 0 | Rating: 0 ]

• Homemade Antenna Rotator Controller - The Antenna Rotator Controller is unique in that it senses, displays, and controls to the earth's true magnetic field. The compass sensor, mounted in a waterproof enclosure, is attached to the mast and sends its signal to a microcontroller
  [ Hits: 2621 | Votes: 3 | Rating: 6.33 ]

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