net frequencies

net frequencies

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• Practical Guanella 1:1 balun - This article proposes a lossy transmission line model of a practical Guanella 1:1 balun that is effective for all frequencies within and immediately adjacent to the pass band
  [ Hits: 3618 | Votes: 3 | Rating: 3.33 ]

• Beverage transformer notes - In this article, the author discusses the importance of good transformers for Beverages, especially for common-mode isolation. The author recommends #43 ferrite for the transformer, and provides the turns required for different core types. The author also recommends using lower permeability ferrites for better performance at lower frequencies.
  [ Hits: 1319 | Votes: 1 | Rating: 10 ]

• Antenna Impedance measurement - When experimenting on an antenna it's often important to determine its feedpoint impedance at various frequencies across the operating band. It's easy enough to measure SWR, but sometimes we need to know more detail than this
  [ Hits: 1426 | Votes: 6 | Rating: 2.67 ]

• Balcony and pedestrian mobile motor tuned loop - This antenna was designed to meet the requirements of a light body worn small magnetic loop covering all the frequencies continuously from 7 MHz to 29.4 MHz
  [ Hits: 2884 | Votes: 0 | Rating: 0 ]

• Magnetic antenna fo ULF - Detection and recording of Schumann resonances and other electromagnetic phenomena at frequencies below 50 Hz By Hans Michlmayr
  [ Hits: 1370 | Votes: 0 | Rating: 0 ]

• Western Pennsylvania Repeater Council - Coordinates amateur radio repeater systems, control and link frequencies
  [ Hits: 300 | Votes: 0 | Rating: 0 ]

• KC7ZRD The North Valleys Simplex Group - This group is located just north of Reno, Nevada and primarily uses simplex frequencies.
  [ Hits: 350 | Votes: 0 | Rating: 0 ]

• HB9FX Internet Remote Base JN37XH Hochwacht Zofingen Switzerland - Online web receiver powered by OpenWebRX based in Switzerland. You can isten between 10kHz - 10GHz frequencies. Receiver is operated by HB9BHU Rig VLF/HF/VHF: Airspy HF+, Magnetic Loop/Discone Rig SHF X-Band LNB, RTL-SDR, Stacked Slot Antenna
  [ Hits: 14072 | Votes: 111 | Rating: 6.7 ]

• Using Olivia MFSK - Short description of the olivia mfsk mode and explanation of how to use olivia mode and proper radio setup including recommended olivia frequencies
  [ Hits: 722 | Votes: 2 | Rating: 5 ]

• UHF VHF Repeaters in Italy - List of VHF UHF ham radio repeaters in italy with frequencies and locations
  [ Hits: 2435 | Votes: 15 | Rating: 6.15 ]

• Arizona Repeaters Directory - Arizona repeaters sorted by counties, with location maps! Also includes Robet's List of verified Arizona scanner frequencies.
  [ Hits: 3918 | Votes: 19 | Rating: 6.31 ]

• Near-Real-Time F2-Layer Critical Frequency Map - This map can be used to determine the frequencies that will always be returned to the Earth. Transmitted frequencies higher than the indicated contours (which are given in MHz) may penetrate the ionosphere, resulting in lost power to space. The map shows the radio auroral zones as green bands near the northern and southern poles.
  [ Hits: 5270 | Votes: 24 | Rating: 4.84 ]

• Small Antennas for High Frequencies - This is about Small Antenna types and their properties which can help choosing proper antenna for high-frequency wireless communications as: two-way radio, microwave short links, repeaters, radio beacons or wireless telemetry
  [ Hits: 723 | Votes: 2 | Rating: 6 ]

• Australian State related frequencies - Submitted frequencies by visitors
  [ Hits: 3767 | Votes: 7 | Rating: 5.29 ]

• TSC Ferrite International - TSC International is a manufacturer of magnetic materials for all frequencies
  [ Hits: 804 | Votes: 1 | Rating: 1 ]

• Shortwave schedules around the world - Shortwave schedules around the world with frequencies in kHz and distance calculator. This web site is an online searchable database of current broadcasting stations. You can search for stations on the air now or for scheduled transmisssion periods and frequencies.
  [ Hits: 1641 | Votes: 9 | Rating: 9 ]

• ILGdb - Free program that interfaces most ICOM radios with the ILG radio frequencies database and lets you click a station in the database to tune your radio to the station, or scan the list looking for stations that are on the air.
  [ Hits: 3285 | Votes: 2 | Rating: 5.5 ]

• Interdigital bandpass filter designer - Fill out the form to design a bandpass filter as described in the January 1985 issue of Ham Radio Magazine. These filters are generally limited to frequencies above 200 MHZ because their size is slightly longer than 1/4 wavelength
  [ Hits: 1117 | Votes: 6 | Rating: 7.67 ]
• 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: 1083 | Votes: 0 | Rating: 0 ]
• About Cavity Filters - Cavity filters are tipically circuitry behind a duplexer that allow only certain frequencies to pass
  [ Hits: 470 | Votes: 3 | Rating: 5.33 ]

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