hf freq

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hf freq

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Antennas : CobWeb
  • CobWeb multiband folded dipole - The cobweb antenna it is basically a 5 band antenna comprising of 5 full half wave dipoles for each band - between 10 meters and 20 meters, the antenna is also resonant on 6M and can be modeled even for VHF frequencies.
    [ Hits: 8620 | Votes: 0 | Rating: 0 ]
Antennas : Theory
  • Azimuth Radiation Patterns - Below VHF the change in the radiation characteristics of an antenna will change considerably from frequency to frequency, making antenna selection more complicated.
    [ Hits: 820 | Votes: 1 | Rating: 10 ]
Ham Radio : Band Plans Internet and Radio : WebSDR
  • 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: 14057 | Votes: 111 | Rating: 6.7 ]
Manufacturers : Antennas : Broadcast
  • TCI International - US global provider of innovative radio frequency (RF) solutions for spectrum monitoring and antenna applications. Specializes in Spectrum Monitoring, Communications Intelligence , HF/MF Broadcasting & Communication antenna systems.
    [ Hits: 559 | Votes: 0 | Rating: 0 ]
Manufacturers : Antennas : Marine
  • LF antennas - Welcome to our line of Low Frequency, Natural Radio Research, Broadcast, Marine and Shortwave products. Our evolving product line is the result of our dedicated research efforts primarily in the areas of LF, VLF, MF, and HF.
    [ Hits: 311 | Votes: 0 | Rating: 0 ]
Manufacturers : Antennas : VHF UHF Microwave : Mobile Antennas
  • US Communication antennas - UnderBumper diversity licence plate antenna system (front and rear license plates) become the antennas. Available in VHF, UHF, Dual Band and other frequencies. We also manufacture mobile antennas for HF VHF UHF wideband antennas
    [ Hits: 580 | Votes: 0 | Rating: 0 ]
Manufacturers : Antennas : VHF UHF Microwave : Yagi Antennas
  • RF HAMDESIGN - An engineering oriented organization specializing in the design and manufacture of high performance parabolic antennas, 3dB high power RF couplers, Antenna power splitters, directional RF couplers and more items for RF transmission from HF through Microwave frequencies.
    [ Hits: 1615 | Votes: 5 | Rating: 9 ]
Operating Modes : Digital Voice
  • FDMDV - Digital Voice - FDMDV - Frequency Division Multiplex Digital Voice Digital Audio over HF SSB. FDMDV is the latest digital voice mode on HF - it caters to high quality digital voice under poor band conditions, in only 1100Hz bandwidth
    [ Hits: 5518 | Votes: 6 | Rating: 7.83 ]
Operating Modes : JT65 Operating Modes : MFSK
  • Olivia, the Magic Digital Mode - Olivia MFSK digital communications are becoming popular in amateur radio because Olivia is one of the most robust methods of text keyboarding, that can perform superbly for long distance communications. Olivia frequencies, format and software
    [ Hits: 1931 | Votes: 8 | Rating: 8.38 ]
Propagation : Resources
  • Radiowave Propagation Center - High frequecy and VHF radio propagation data, solar and geomagnetic real-time and historic data, sunspot activity reports, as well as forecasts. A comprehensive propagation resource compiled by Tomas Hood, editor of the propagation columns of CQ, CQ VHF, Popular Communications, and Monitoring Times magazines.
    [ Hits: 444 | Votes: 1 | Rating: 10 ]
Radio Scanning : Maritime Shopping and Services : Antennas : VHF Antenna
  • Specialist Antennas - Antenna products and accessories for commercial, industrial, Emergency Service and military applications covering VHF, UHF, TETRA, ISM and GSM frequencies and beyond.
    [ Hits: 485 | Votes: 0 | Rating: 0 ]
Software : Antenna analysis
  • HF Beam Calculator - A javascipt online calculator for 2 and 3 element beam antennas. Just input frequency and will diplay element dimensions and spacing. Measurements in Feet and Meters by G4VWL
    [ Hits: 3438 | Votes: 27 | Rating: 5.45 ]
Technical Reference : Coax Cables and Connectors
  • Using RG-174 Coaxial Cable - Notes on using RG-174 Coaxial Cable at Medium and Lower HF Frequencies by John Bryant and Bill Bowers
    [ Hits: 929 | Votes: 4 | Rating: 4.25 ]
Technical Reference : Homebrew
  • Frequency Locked Loop VFO for HF - A device which joins in a single microprocessor a digital programmable frequency meter and a control logic capable to lock a manually tuned VFO to its actual frequency by IK3OIL
    [ Hits: 1852 | Votes: 4 | Rating: 7.75 ]
  • Improved PL Tone encoder - N1HFX project to improve PL tone encoder providing a more stable frequency
    [ Hits: 583 | Votes: 0 | Rating: 0 ]
Technical Reference : Preamplifiers
  • General purpose RF Wideband PreAmp - General purpose RF Wideband PreAmp based on BSX-20 transistor with a frequency range 14-550 MHz
    [ Hits: 2404 | Votes: 2 | Rating: 5.5 ]

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