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radio frequency

201 links and 6 categories about radio frequency on dxzone.com

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Antennas : Receiving
  • Remotely-tuned loop antenna for LW and MW - This article describes how to build a loop antenna for low frequency (LF) and medium wave (MW) reception with remote-controlled tuning. The antenna is extremely sensitive and can be built mostly from parts from old radios and tape recorders. Like all loop antennas, it is highly directional, which allows you to null out unwanted noise sources.
    [ Hits: 2614 | Votes: 1 | Rating: 1.00 ]
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: 2818 | Votes: 8 | Rating: 6.75 ]
Antennas : Wire
  • The Zeppelin antenna - It consists of a radiating wire with a length equal to the half-wave of the fundamental frequency for which the antenna is cut.
    [ Hits: 1772 | Votes: 1 | Rating: 6.00 ]
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: 252 | Votes: 1 | Rating: 10.00 ]
Ham Radio : Band Plans : Frequency coordination Ham Radio : Blogs : USA
  • Resonant Frequency: The Ham Radio Podcast - The amateur radio podcast was created to help get information on amateur radio out to the new ham and the ham that wants to find out about different aspects of the hobby they are thinking about trying out.
    [ Hits: 1020 | Votes: 5 | Rating: 10.00 ]
  • K9ZW Blog - With Varying Frequency - Amateur Radio Ponderings
    [ Hits: 160 | Votes: 0 | Rating: 0.00 ]
Ham Radio : Clubs : North America : Canada : British Columbia
  • Malaspina College amateur radio society - VE7RME repeater is located in Nanaimo. It operates on a transmit frequency of 146.98 mhz and a receive frequency of 146.38 mhz
    [ Hits: 156 | Votes: 0 | Rating: 0.00 ]
Ham Radio : Clubs : North America : USA : California
  • T.A.S.M.A. - Amateur radio spectrum management and frequency coordination entity for 2-meters in southern california.
    [ Hits: 463 | Votes: 0 | Rating: 0.00 ]
Manufacturers : Amplifiers Manufacturers : Cable and Connectors
  • Radio Frequency Systems - RFS is a global designer and manufacturer of cable and antenna systems plus active and passive RF conditioning modules, providing total-package solutions for wireless infrastructure.
    [ Hits: 284 | Votes: 1 | Rating: 10.00 ]
Manufacturers : Test Equipment : Frequency Counter Operating Aids
  • RFSM-2400 Digital Mode - A recent digital radio protocol. Based on a freeware soundcard-based Radio Frequency Software Modem. Work under standart MIL-STD-188-110A. Maximum speed 2400 bit/second. Signal bandwidth: 0,3-3,3 kHz (standard mode) and 0,3-2,7 kHz (non-standard mode).
    [ Hits: 3291 | Votes: 16 | Rating: 6.18 ]
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: 271 | Votes: 0 | Rating: 0.00 ]
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: 1847 | Votes: 5 | Rating: 6.80 ]
Software : Decoders
  • DTMF decoder  updated - A very easy to use program to decode DTMF dial tones found on telephone lines with touch tone phones. The DTMF Decoder is also used for receiving data transmissions over the air in amateur radio frequency bands.
    [ Hits: 6006 | Votes: 9 | Rating: 5.44 ]
Software : Macintosh
  • The KB6IBB Utilities - Ham radio frequency list consolidation software. The Ham Radio database can house a unlimited number of records. Holding frequency information from DC to Daylight. The Radio Scanner Database is designed to emulate a radio scanner. A 5,000 record table is provided and is organized by channel number.
    [ Hits: 722 | Votes: 1 | Rating: 7.00 ]
Software : Pocket PC
  • Ham Fan - A free small database program for Palm OS that allows you to log ham radio contacts. You can log the call sign, name, date, time and frequency of the contact.
    [ Hits: 657 | Votes: 0 | Rating: 0.00 ]
  • CTR-Remote - CTR-Remote is an enhanced version of CTR817 (a Pocket PC radio control program for the Yaesu FT-817). The program has been completely re-written using Microsoft Visual Studio .NET and now supports a wider range of radios, Bluetooth® wireless technology and/or TCP/IP and Wi-Fi radio control, ADIF log import and export format, custom frequency lists, DX Cluster monitoring, callsign lookup, and enhanced scanning options.
    [ Hits: 1718 | Votes: 4 | Rating: 3.25 ]
Software : Radio Control
  • RadioComm - RadioComm can be used to program your Icom radio's memory, or to create nice radio-frequency spectra (see above) or to interface your radio to a huge database of frequencies.
    [ Hits: 18921 | Votes: 17 | Rating: 6.24 ]
  • Virtual Legacy Radio - Windows remote control for Yaesu or Icom. Displays the current transceiver settings frequency, mode, and others on the PC in an old-fashioned way that corresponds to the look of receivers in 70's. DX-Cluster Watch (DCW) is an application that automatically refreshes a web page with the dx-cluster content, parses spot lines from it, keeps a consolidated list and inserts the spots to VLR as frequency markers by OK1FIG
    [ Hits: 1319 | Votes: 4 | Rating: 10.00 ]
  • KE7ATE - VR-5000 Signal Capture and Analysis Software - Give your VR-5000 a new face. Controls your VR-5000, Log stations, Manage frequency lists, Record Audio and more. This program utilizes a more visual approach to simplify your radio listening.
    [ Hits: 1296 | Votes: 3 | Rating: 4.00 ]
Technical Reference : Filters
  • TVi Basics - making filters - TV Interference filters, making TVI filters, coaxial filters to eliminate TV interferences caused by radio frequency
    [ Hits: 740 | Votes: 0 | Rating: 0.00 ]
Technical Reference : Spectrum Analyzers
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