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How to build roofspace antennas and get them to work
In designing the antenna, the first reqirement is to ensure that the section carrying the most current is a high as possible
post 03 Nov 2024
Antennas theory Links →
Los dipolos
The dipoles are generally half wavelength antennas, these are calculated using the following formula: Total dipole length = 142.5 / F (MHz)
Magnetic Loop Antenna Theory
The loops shown are all coupled with a ferrite transformer which is used to match the 50 ohms coaxial
Micro Controller Projects
On this web site you will find a series of projects of interest to Radio Amateurs and other hobbyists
Open line
It is often thought that running an open line through a wall is difficult
Rhombic antennas
The highest development of the long-wire antenna is the RHOMBIC ANTENNA It consists of four conductors joined to form a rhombus, or diamond shape
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The dipoles are generally half wavelength antennas, these are calculated using the following formula: Total dipole length = 142.5 / F (MHz)
The loops shown are all coupled with a ferrite transformer which is used to match the 50 ohms coaxial
On this web site you will find a series of projects of interest to Radio Amateurs and other hobbyists
It is often thought that running an open line through a wall is difficult
The highest development of the long-wire antenna is the RHOMBIC ANTENNA It consists of four conductors joined to form a rhombus, or diamond shape
Antenna splitter per VHF-UHF per quattro ricevitori Chi dispone di una sola antenna e vuole collegarvi più di un ricevitore necessità di uno splitter
Amateur radio kits by Kanga US
50MHz to 28MHz RX Converter The concept of the rx converter is quite simple and nothing really new. the local oscillator is a standard colpitts crystal oscillator producing the 22mhz lo signal