Author Archives: Simone
Petlowany Antennas by K6NO
If you have any interest in antennas at all, fasten your seat belts and hang on to your hats, because what you are about to read here is going to blow you away. Conventional wisdom concerning antenna matching and resonating is about to be shattered and the principles revealed here might just be the start
7 elements Yagi-Uda Antenna for 144 MHz
An original project by I0QM of a 7 element yagi anetnna in a PDF File. The QM7 antenna is a simple 7 elements Yagi with 3.7 m boom length for the lower 144 MHzSSB/MGM band forward gain is 1.35 dBd; i.e. 13.5 dB forward gain over the isotropic radiator, while the F/R is about 12.5
Rhombic Antenna
Rhombic Antenna dimensions and plan for HF and VHF bands by N6JSX
Cobracom – Waveguide
Oscilloscope, Realtime spectrum analyzer, Impedance meter, RLC bridge and signal generator for Windows. Is a Windows application that converts your PC into a powerful dual-trace signal analyzer (oscilloscope, FFT etc…) . Uses your PC sound card as an Analog-to-Digital a Converter to digitize any input waveform and as Digital-to-analog Converter for the signal generator. True
Boomless Quad
A Quad antenna is a full wavelength conductor in the form of a square (or circle or diamond). It is actually two half wave dipoles spaced half wave length apart, bent at right angles at l/8th wavelength points and joined together. If the Quad is fed at either sides it is vertically polarized and if
A 1:1 Coaxial Balun
This balun documented by I0QM use a ¼ wavelength and the ¾ wavelength adapting sections with the 50-Ohm coaxial cable, or a coax line with the impedance you need.
6 Element Log Periodic Yagi for 6 meters
G3SYC began designing and using a LPY on 6 metres in 1991. Since then he has refined the design and has worked some superb dx from his qth in IO93. The design featured here evolved in 1996, and is the mk2 version. This yagi antenna has a very clean polar pattern and a good front
eSoftAnywhere DSP & More
This freeware software performs DSP (Digital Signal Processing) on audio signals received from an input line on your computer’s sound card. It is specifically intended for processing audio signals from short wave, amateur (ham) radios, or any other radio to “clean up” or improve the listening quality of radio signals. It can also improve radio
The Stacked J-Pole
First build a regular MonoBand J-Pole from the Copper Cactus plans for a 2-meter antenna, leaving off the top pipe cap. Build a second J-Pole, which will look like an L-Pole, the vertical is 38-3/4 inches from the top of the antenna, down to the centerline of the horizontal member. The lower leg of the