4 meter

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4 meter

850 links - and 11 categories

Antennas : 10M
  • 28 MHz 3 elements Yagi - OZ2OE Technical pages, a 3 element 28 MHz light weight Yagi for 10 meters band
    [ Hits: 5567 | Votes: 8 | Rating: 4.37 ]
Antennas : 20M 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: 7157 | Votes: 5 | Rating: 7.8 ]
Antennas : 20M : 20 meter Yagi antennas Antennas : 2M
  • 6 and 2 Meter Square Copper Dipoles - In this eHam article you will find parts list and dimension sheet for a 2m square dipole, made from copper plumbing fittings and 1/2 inch copper water pipe.
    [ Hits: 7075 | Votes: 6 | Rating: 6.33 ]
Antennas : 40M
  • Ground Plane for 7 MHz - How to build a ground plane antenna for the 40 meters band in french
    [ Hits: 3146 | Votes: 2 | Rating: 7 ]
  • 40 meter Moxon by SM0DTK - A wire moxon antenna plan for the 7 Mhz
    [ Hits: 7757 | Votes: 19 | Rating: 7.1 ]
Antennas : 40M : 40 meter Vertical Antennas Antennas : 6M : 6 meter Yagi Antennas 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: 4375 | Votes: 4 | Rating: 3.5 ]
Antennas : Portable
  • Inverted L Portable Antenna - An 87ft inverted L portable antenna working on 80 40 30 20 15 meters band
    [ Hits: 2400 | Votes: 3 | Rating: 9.33 ]
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: 3741 | Votes: 3 | Rating: 8 ]
Antennas : Yagi Operating Modes : SSTV : SSTV Images
  • Digital SSTV images - HAMDRM pictures received on 80 meters band at 3733 KHz
    [ Hits: 291 | Votes: 2 | Rating: 10 ]
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: 11311 | Votes: 9 | Rating: 7.77 ]
Technical Reference : Amplifiers : VHF Amplifiers

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