radio frequency

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radio frequency

213 links - and 6 categories

Antennas : Spiral
  • Petlowany Antennas by K6NO - WorldRadio Article on Petlowany antennas base on this principle: if a length of wire is wound into a spiral-shaped coil and excited by a radio frequency current connected to the innermost portion of the coil, it will then, and only then, exhibit RF characteristics that closely approximate those of a resonant linear wire of the same length
    [ Hits: 3765 | Votes: 9 | Rating: 6.22 ]
DX Resources : Beacons : 10 meter beacons
  • VA3GRR - Radio Beacon - VA3GRR is a radio beacon, operating on the 10 meter amateur band. Its frequency is 28.205.5 MHz. It runs just under 5 watts of power into a vertical half-wave ringo style antenna
    [ Hits: 476 | Votes: 1 | Rating: 10 ]
Ham Radio : Blogs : USA
  • K9ZW Blog - With Varying Frequency - Amateur Radio Ponderings
    [ Hits: 407 | Votes: 0 | Rating: 0 ]
Manufacturers : Antennas : VHF UHF Microwave
  • RFS - Radio Frequency Systems (Formerly Celwave, Cellwave, Cablewave),Wifi antennas, duplexers.
    [ Hits: 477 | Votes: 0 | Rating: 0 ]
Operating Aids : Radio Spectrum
  • Allocation of Radio Spectrum - This is the table of contents to a list showing how the radio frequency spectrum is allocated to different users in the United States.
    [ Hits: 1473 | Votes: 1 | Rating: 6 ]
  • Shortwave Frequency Guide - Frequency list with service name and related comments
    [ Hits: 1448 | Votes: 2 | Rating: 1.5 ]
Operating Modes : Morse code : Clubs
  • New England Historical Radio Society - The New England Historical Radio Society Inc. is an organization dedicated to the preservation of commercial Morse Radiotelegraphy on medium and high frequency.
    [ Hits: 529 | Votes: 0 | Rating: 0 ]
Propagation : Resources
  • Understanding propagation numbers - Quick reference table on understanding A K SFI indexes and how can be translated in usable frequency opportunities
    [ Hits: 2749 | Votes: 4 | Rating: 10 ]
Radio Equipment : HF Transceivers : Yaesu FT-817
  • The KA7OEI FT-817 pages - FT-817 Radio Modifications, Improving the FT-817 Noise Blanker, increasing output power, using rechargeable cells, epanding frequency range
    [ Hits: 982 | Votes: 0 | Rating: 0 ]
Radio Scanning : Regional : Europe
  • Frequenzdatenbank.de - Frequency database for Germany. Emergency services, aircrafts, radio and paging system with over 2000 frequencies from all over Germany.
    [ Hits: 1410 | Votes: 14 | Rating: 4.15 ]
Shopping and Services : Kits and Components
  • LCD Digital Dial DDS VFO - Low Cost frequency counters and DDS VFO's for QRP and Vintage Radio's. LCD Digital Display, Frequency Counter or DDS VFO
    [ Hits: 804 | Votes: 2 | Rating: 5.5 ]
Software : Radio Control
  • RadioComm - RadioComm can be used to program your Icom radio's memory, or to create nice radio-frequency spectra or to interface your radio to a huge database of frequencies.
    [ Hits: 1227 | Votes: 3 | Rating: 10 ]
Technical Reference : Frequency Counter Technical Reference : Homebrew
  • 75 meter AM Transceiver - Frequency coverage: 3.75 MHz to 4.00 MH transceiver for 75 MHz band
    [ Hits: 1189 | Votes: 1 | Rating: 10 ]
Technical Reference : Microphones Technical Reference : RF Safety Technical Reference : Radio Frequency Interference
  • TVi Basics - making filters - TV Interference filters, making TVI filters, coaxial filters to eliminate TV interferences caused by radio frequency
    [ Hits: 1027 | Votes: 0 | Rating: 0 ]
Technical Reference : Radio Frequency Interference : Noise Reduction
  • Noise tutorials - Noise foundamentals. Radio frequency interference noise.
    [ Hits: 742 | Votes: 0 | Rating: 0 ]
Technical Reference : Spectrum Analyzers

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