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899 links - and 26 categories

Antennas : Feed Lines
  • Setting the SWR of Your Antenna - SWR (standing wave ratio), is a measurement of how efficiently your antenna system will radiate the power available from your radio. In simple terms, your radio would like to radiate all of its power, but can only do so if the other components cooperate
    [ Hits: 1124 | Votes: 0 | Rating: 0.00 ]
Antennas : Theory
  • Understanding Standing Wave Ratios SWR - We worry a lot about Standing Wave Ratio (SWR) in amateur radio since SWR is one indication of how well our antenna system is working. Most HF transceivers and antenna tuners have built in SWR meters. SWR is a measure of a transceiver' s output power verses the portion of that power reflected by the antenna system
    [ Hits: 8148 | Votes: 8 | Rating: 4.75 ]
Antennas : Theory : Antenna Gain Manufacturers : Alternative Power : Portable Generators
  • All Power America - Generators, portable generators maufacturer
    [ Hits: 823 | Votes: 2 | Rating: 1.50 ]
Manufacturers : Amplifiers
  • OM Power - HF Amplifier - Strong RF HF power amplifiers made in europe ! Output 2,5KW 4KW PEP, 160m to 10m.
    [ Hits: 8412 | Votes: 26 | Rating: 7.27 ]
Manufacturers : Lightning and Surge Protection
  • Citel - We have a wide range of power protectors and surge protection products available
    [ Hits: 540 | Votes: 0 | Rating: 0.00 ]
Manufacturers : Test Equipment : Power Meter
  • Telewave - Telewave's innovative engineering produces the industry's toughest antenna systems. Yagi, Fiberglass Collinear, and Dipole models are available from 66-2500 MHz. Wattmeters, test equipment,rf power meters, duplexers, filters and cavities, transmitters combiners
    [ Hits: 1703 | Votes: 0 | Rating: 0.00 ]
Manufacturers : Tubes & Semiconductors
  • Eimac - Innovators in Power Tube Technology
    [ Hits: 829 | Votes: 1 | Rating: 10.00 ]
Operating Aids : Beginner's Guides
  • About digital modes - The digital modes provide a wonderful opportunity for those of us who would like to work on the HF bands but find CW too difficult and SSB phone prohibitive because of interference problems. The digital modes are easy to set up and get operating, require low power and a narrow band.
    [ Hits: 7188 | Votes: 6 | Rating: 8.00 ]
Operating Modes : Packet Radio
  • RadioMirror Tutorials - RadioMirror amateur packet radio multicast software is a powerful tool for distributing information to many hams at once, and can be especially useful during the course of an emergency
    [ Hits: 350 | Votes: 0 | Rating: 0.00 ]
Operating Modes : Stealth Amateur Radio
  • HF Antennas for restricted space - Arrl document about invisible antennas and indoor systems. It is important to consider that few compromise antennas are capable of delivering the performance one can expect from the full-size variety. But the patient and skillful operator can often do as well as some fellows who are equipped with high power and full-size antennas. The "cliff-dweller" may not be able to "bore a hole" in the band as often, and as easily, but DX can be worked successfully when band conditions are suitable.
    [ Hits: 7583 | Votes: 6 | Rating: 4.83 ]
Radio Equipment : HF Transceivers : Yaesu FT-817
  • Auto Band Select Box for the FT-817 - This project is an interface box for the Yaesu FT-817 that includes a band output port, a computer serial interface, and a remote interface for the FL-7000 (and Quadra?) solid state power amplifiers
    [ Hits: 2062 | Votes: 0 | Rating: 0.00 ]
Shopping and Services : RF Tubes
  • Rebuilt Power Vacuum Tubes - ECONCO has been rebuilding vacuum tubes for more than 30 years. Our commitment to quality, and concern for the environment has won us the acclaim of clients worldwide.
    [ Hits: 717 | Votes: 0 | Rating: 0.00 ]
Software : Antenna analysis
  • Nec2Go - Powerful antenna modeling tool using NEC 2 computing engine. Nec2 specifically provide users, either those experienced with the Nec2 processes, or for those who are neophytes but want to model their own antennas. Nec2Go uses a simplified process for defining the antenna structure and then providing view of the structure, plots (2D and 3D) and other significant data that is pertinent to the design. This simplified process uses an edit file with equations for all definitions.
    [ Hits: 1739 | Votes: 1 | Rating: 5.00 ]
Software : Logging
  • Turbolog - TurboLog is a station management and logging program for the discerning radio amateur / hamradio operator. Besides powerful database and logging functions there is a fully integrated support for the control of typical radio station equipment, e.g. Transceivers, Packet radio, Morse and voice keyer, Digital modes terminal, Antenna switching, Acoustic alerting, and more. Trial version available
    [ Hits: 1092 | Votes: 2 | Rating: 4.00 ]
Software : Oscilloscope
  • Cobracom  pop - Oscilloscope, Realtime spectrum analyzer, Impedance meter, RLC bridge and signal generator for Windows. Is a Windows application that converts your PC into a powerful dual-trace signal analyzer (oscilloscope, FFT etc...) . Uses your PC sound card as an Analog-to-Digital a Converter to digitize any input waveform and as Digital-to-analog Converter for the signal generator. True 24 bit adc/dac 48K/96k/192k sampes/sec.
    [ Hits: 19284 | Votes: 8 | Rating: 5.37 ]
Technical Reference : Amplifiers : VHF Amplifiers
  • 50 MHZ power amplifier - YU1AW power amplifier for 6 meters band using 2xGI7B
    [ Hits: 1095 | Votes: 0 | Rating: 0.00 ]
Technical Reference : Calculators
  • Amateur Radio RF Safety Calculator - University of Texas Amateur Radio Club RF-Calculator. This is a main beam power density estimation program intended for use as part of a routine evaluation of RF safety compliance with FCC regulations
    [ Hits: 5522 | Votes: 26 | Rating: 7.81 ]
Technical Reference : Radio Direction Finding
  • The Fox - 750 mw transmitter - This RDF three transistor 144 MHz transmitter uses a 48 MHz scanner crystal as an oscillator / tripler. A second transistor boosts the signal to 40 milliwatts, a third amplifies the power output to 750 milliwatts. Includes schematic and pictures.
    [ Hits: 222 | Votes: 2 | Rating: 5.50 ]
Technical Reference : Radio Frequency Interference
  • Safety: RF awarness guidelines - Although Amateur Radio is basically a safe activity, in recent years there has been considerable discussion and concern about the possible hazards of electromagnetic radiation (EMR), including both RF energy and power frequency (50-60 Hz) electromagnetic fields. This section summarizes what is now known and offers safety precautions based on the research to date.
    [ Hits: 444 | Votes: 0 | Rating: 0.00 ]
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