frequency

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frequency

544 links - and 9 categories

Antennas : Homebrewing Techniques
  • From Transmitter to Antenna - A collection of articles on the subject of impedance, impedance matching and high-frequency power transmission by G3YNH
    [ Hits: 1028 | Votes: 0 | Rating: 0.00 ]
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: 715 | Votes: 1 | Rating: 10.00 ]
  • Earth Systems - In order to resonate at a particular frequency, an antenna needs to be at least one half wave length long. Antennas below a 1/2 wave are dependent on a ground system for resonance as well.
    [ Hits: 945 | Votes: 1 | Rating: 3.00 ]
Ham Radio : Band Plans
  • Ham Bands - Simplified U.S. frequency allocations table by K8ZT
    [ Hits: 6352 | Votes: 21 | Rating: 6.24 ]
Manufacturers : Amplifiers
  • Microset - Power supplies, rf power amplifiers, dummy loads, frequency counters, repeaters antennas manufacturer based in Italy
    [ Hits: 1657 | Votes: 1 | Rating: 1.00 ]
Manufacturers : Antennas : VHF UHF Microwave
  • RFS - Radio Frequency Systems (Formerly Celwave, Cellwave, Cablewave),Wifi antennas, duplexers.
    [ Hits: 354 | Votes: 0 | Rating: 0.00 ]
Manufacturers : Parts and Surplus
  • FMI - FMI provides superior solutions in the design and manufacture of frequency control devices including Voltage Controlled Temperature Compensated Crystal Oscillators (VCTCXO), voltage controlled crystal oscillator (VCXO), Temperature Compensated Crystal Oscillators (TCXO), crystal clock oscillators, high temperature oscillators, surface mount and crystal oscillator products, phase locked sources and more.
    [ Hits: 394 | Votes: 0 | Rating: 0.00 ]
Manufacturers : QRP Kits
  • N3ZI Kits - Low Cost Frequency Counter, Digital Display and DDS-VFO kits
    [ Hits: 1908 | Votes: 5 | Rating: 5.40 ]
Operating Modes : Radio Direction Finding
  • Radio Frequency Beacon Finder - This project is a radio frequency receiver that will help the user the trace the direction and distance of transmitter beacon(s) operating at 433MHz frequency by Cornell Univerity
    [ Hits: 1392 | Votes: 6 | Rating: 5.00 ]
Propagation
  • WSPRnet Weak Signal Propagation Reporter Network - A group of amateur radio operators using K1JT's MEPT_JT digital mode to probe radio frequency propagation conditions using very low power transmissions. Computer sent/received Morse signals received by amateurs and collected on an online database.
    [ Hits: 994 | Votes: 2 | Rating: 10.00 ]
Propagation : Resources
  • Understanding propagation numbers - Quick reference table on understanding A K SFI indexes and how can be translated in usable frequency opportunities
    [ Hits: 2590 | Votes: 4 | Rating: 10.00 ]
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: 830 | Votes: 0 | Rating: 0.00 ]
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: 1182 | Votes: 13 | Rating: 3.70 ]
  • Suomen taajuuslista 2000 - DB Frequency Site From Finland. In Finnish
    [ Hits: 2482 | Votes: 14 | Rating: 5.50 ]
Software : Spectrum analyzers
  • Spectrum Analyzer Real-time FFT - Eight-channel Audio Spectrum Analyzer is a set of Real-Time Multi-Channel Gauges for investigation of data accepted from any ADC you will want or 16-, 24- and 32-bit ADC of sound card. WDM drivers support. FFT Spectrum Analysis, OscilloScope, Frequency counter, AC/DC voltmeter, Signal-to-Noise Ratio, Signal-to-Noise and Distortion, Spurious-Free Dynamic Range, Effective Number Of Bits, Total Harmonic Distortion, Inter-Modulation Distortion, Phase Shift. Special modes of dual-channel FFT spectral analysis: Separate channels spectra, Spectra of digital sum, difference, product of two signals, Spectrum of digital product of original signal and its fundamental, Spectrum of Real and Complex Transfer Function, Cross Spectrum. Standart weighing of spectra according IEC and CCIR. Oscilloscope modes (for dual-channel ADC) are: original signals, sum, difference, dependence of one channel on another, amplitude distribution of input signals.
    [ Hits: 11019 | Votes: 9 | Rating: 7.77 ]
Software : Time
  • QSO Clock - little program for those that can never find a pencil when we hear the DX station calling CQ on the frequency on which we're tuned up.
    [ Hits: 872 | Votes: 0 | Rating: 0.00 ]
Technical Reference : Duplexers
  • What's a diplexer? - It's a network that splits a signal to two or more loads, dependent on frequency. It is the simplest form of a multiplexer, which can split a signal into many different signal bands.
    [ Hits: 1593 | Votes: 0 | Rating: 0.00 ]
Technical Reference : Microphones Technical Reference : Radio Frequency Interference : Noise Reduction
  • Noise tutorials - Noise foundamentals. Radio frequency interference noise.
    [ Hits: 519 | Votes: 0 | Rating: 0.00 ]
  • Calculating the Received RF Noise Power - Voacap, high-frequency ionospheric communications analysis and prediction
    [ Hits: 319 | Votes: 1 | Rating: 6.00 ]
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