4 meter

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4 meter

813 links - and 9 categories

Antennas : 10M Antennas : 20M
  • EH antenna for 14 Mhz - Documentation on how to build your own EH antenna for the 20 meters band by F5SWN
    [ Hits: 2807 | Votes: 2 | Rating: 5.50 ]
  • 20 meters moxon antenna by SM5JAB - SM5JAB first experiment of a HF moxon antenna working on 14 mhz
    [ Hits: 4435 | Votes: 5 | Rating: 8.20 ]
Antennas : 20M : 20 meter Dipole Antennas Antennas : 20M : 20 meter Vertical Antennas
  • Vertical moxon for 14 Mhz - A vertical Moxon with different feeding for the 20 meters
    [ Hits: 5696 | Votes: 4 | Rating: 9.00 ]
Antennas : 20M : 20 meter Yagi antennas Antennas : 40M Antennas : 40M : 40 meter Vertical Antennas Antennas : 6M : 6 meter Yagi Antennas Antennas : Magnetic Loop
  • The Thick Loop - The performance of a small magnetic loop can be improved constructing it larger, thicker or both. The antenna is covering from 12 Megahertz to 32 megahertz and adding a 156 Pico farads ceramic capacitor it resonates on the 40 meters band. by PY1AHD
    [ Hits: 926 | Votes: 0 | Rating: 0.00 ]
Antennas : Mobile
  • W5JGV Mobile Antenna - A High Efficiency Extended Length Mobile Antenna The antenna itself is 3.42 meters or 11 feet 2 inches long from the top of the mounting spring to the tip. By W5JGV
    [ Hits: 3622 | Votes: 4 | Rating: 7.25 ]
Antennas : Multiband
  • Another vertical antenna for 30, 40 and 80 meters - This article is to describe a multi band DX-dedicated antenna offering a minimum of compromises (such as lossy traps), for the hams not having any high-support
    [ Hits: 4053 | Votes: 3 | Rating: 3.67 ]
Antennas : Windom
  • The FD4 Windom antenna - This antenna originated from darc QRV magazine in 1971 should be attributed to DJ2KT, works on 80 40 20 10 meters without ATU, based on the Windom principle.
    [ Hits: 3496 | Votes: 3 | Rating: 8.00 ]
Antennas : Wire
  • Homebrew a W3DZZ antenna  pop - Build your own multiband W3DZZ antenna resonating on 80 40 20 15 and 10 meters band
    [ Hits: 18979 | Votes: 17 | Rating: 6.37 ]
DX Resources : Beacons 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: 11032 | Votes: 9 | Rating: 7.77 ]
Technical Reference : Amplifiers : VHF Amplifiers
  • 50 Mhz Amplifier - This is a homebrew 100 watt six meter linear amplifier. The project was designed by Pat Bunn - N4LTA, and was featured in the October 1990 issue QST magazine.
    [ Hits: 2213 | Votes: 2 | Rating: 8.50 ]
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