very low frequency

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very low frequency

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Antennas : Delta loop

  • DL-Special DX Antenna - 2 Delta Loops in Phase - Two Delta-Loops in phase. The purpose of this article is to propose an antenna with a high gain, a high efficiency and a very low price that is easy to build for any frequency.
    [ Hits: 1075 | Votes: 4 | Rating: 7.25 ]
Antennas : Feed Lines
  • Transmission Lines - Whenever you choose a coax feedline, the frequency of operation is a very important consideration. Over the operating bandwidth of the coax the VSWR is low, typically 1.2:1 or better. Insertion loss is also an important parameter. It is usually specified in dB/foot and is a linear relationship.
    [ Hits: 1272 | Votes: 0 | Rating: 0 ]
DX Resources : Beacons : Beacon stations
  • WA8YWO - High Frequency Expermental Beacon "WV". The Beacon operates on the frequency of 13.55567mhz. This Beacon is very low power. It operates under Part 15 of the FCC Rules and Regulations. It transmits with only 1.5 milliwatts of power
    [ Hits: 409 | Votes: 0 | Rating: 0 ]
Manufacturers : Antenna Analyzers
  • HG7AN Antenna Analyzer - Antenna Analyzer plus 500 is a multifunctional measuring instrument, very useful for amateur radio activity. Its size allows you to easily take it for relocation as well. Frequency range: 100KHz - 500MHz. Access directly via WiFi. Includes a dual-channel signal generator
    [ Hits: 264 | Votes: 1 | Rating: 10 ]
Manufacturers : Test Equipment
  • Spectrum Instruments - Spectrum manufactures very high-performance, low-cost, GPS-disciplined time and frequency reference standards for industry, scientific, calibration, broadcast and amateur operators.
    [ Hits: 470 | Votes: 1 | Rating: 10 ]
Radio Scanning : Nature
  • Natural Radio Listening: Streaming Audio - A page about fascinating Very Low Frequency and natural radio, with lots of streaming audio links from remote receivers. Some experimental stereo pairs around the world.
    [ Hits: 2269 | Votes: 6 | Rating: 7.33 ]
Radio Scanning : Police Scanning
  • Frequency Guide Victoria - A site for every scanner enthusiast but especially for people living or visiting the lower Vancouver Island Area and Victoria B.C. Canada. This page has pictures with aerial pictures.
    [ Hits: 4055 | Votes: 12 | Rating: 5.75 ]
Technical Reference : Filters
  • W3LPL Receiving Bandpass Filters - Project of receive only filters optimized for minimal loss and very high rejection of frequencies below 75% of the filter center frequency by K1TTT
    [ Hits: 1079 | Votes: 0 | Rating: 0 ]
Technical Reference : Frequency Counter
  • 40MHz Frequency Counter Module - Design for a very low cost 6-digit frequency counter module using of the shelf components
    [ Hits: 2336 | Votes: 5 | Rating: 4.8 ]

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