The Adcock antenna has been used for a long time for RDF. It is basically an interferometer. When both of the two dipoles see exactly the same signal strength and RF phase, no signal is delivered to the receiver. This condition happens only when the signal source is equal distance from the two dipoles. As…
Author: Simone
Born in 1970 currently live in Florence Italy.
Married with 2 childrens work as IT Technician.
An Improved Multiband Trap Dipole Antenna
You need this—traps with lower loss, higher Q, increased power-handling capability and four-band coverage! This improved multiband trap dipole introduces a new trap design and a change in trap location. The antenna features double-coaxial-cable-wound traps having lower reactance and a higher quality factor (Q) than earlier coax-cable traps. . Article published on QST, author and…
3 Element 28 MHz light weight Yagi
Background: In the solar maximum years 28 MHz is full of DX stations, that can be worked with very simple equipment. However the fun will be even greater with a proper antenna. So I decided to build a 3 elm. yagi and took the design from ARRL’s: “Yagi Antenna Design” by W2PV. But I also…
WLAN antenna 2.4 GHz Do-It-Yourself
Homebrew outdoor antenna to 2.4 GHz band.Antenna gain is comparable to panel antennas including the Freedom Antenna Set sold in Finland. Comparing is made simple by connecting antennas to same computer with Orinoco WLAN card and indicating results in Link Test of the Client Manager. My antenna has been found about 2 dB better gain…
2 meter mobile antenna
Do you have trouble getting your mobile signal into the LEO satellites? Try this small 2 meter vertical antenna with your mobile rig or HT and enjoy more success in your uplink. I built this small vertical because I could not uplink very well at low elevations and I just could not bring myself to…
Calculate your antenna gain
More than ten years ago a humorous article on antenna gain was published in the ham radio magazine “QRV.” The article stated that there are three kinds of gain: 1. the dB/d and dB/i gain based on CCIR regulations (the true and honest real gain!)2. the “dB/ham radio gain,” which is 6dB higher than the…
Halo antenna for 70Mhz
Concepts The halo is an omni-directional antenna with horizontal polarization. This is practically a horizontal loop, namely a half-wave folded dipole, with its endings slightly separated. The feeding is done through a system called gamma-match with the condenser obtained by inserting the central core of rg58 cable including the insulator, inside the aluminum tube that…
Endfed 20/30 Mtr Antenna
I’ve had good luck with an endfed antenna on 20 and 30 meters. Depending on available trees/supports I can arrange this antenna as an inverted vee, a sloper or a horizontal 1/2 wave. It functions an endfed zepp on 20 meters consisting of a 1/2 wave 20 meter wire (33′ 3″ long) endfed with a…
EH Antenna calculator
A simple EH Antenna calculator that will help you in calculating turns a spacing of antenna traps Download EH Antenna Calculator
Zakanaka
Zakanaka, a digital mode decoding and terminal program written by Bob Furzer, K4CY. Bob is also the author of Logger, a logging program with a PSK31 decoding and terminal module that runs under Windows 95/98, Windows 2000, and Windows NT Was originally intended to decode PSK31, RTTY, and CW. During November 2000, K4CY added RTTY…