Hits
Antenna multiband 10-20-40m
Bi-directional radiation perpendicular to the strands of the doublet Impedance from 50 to 75 ohms depending on the angle of the reverse V
post 19 May 2024
Antenna Multibands Links →
Antenne rhombique
Directivite de cette antenne 20 a 90 suivant longueurs de fil utilise Le gain en puissance varie de 15 a 60, L'impedance de l'antenne varie de 650 a 700 ohms, Pres d'un tiers de l'energie est consomme par la resistance terminale de 800 ohms non selfique
Balun Toroide 1:1 per Morgain
La Morgain e' un'antenna a struttura elettrica simmetrica, con un valore d'impedenza di circa 50 ohm
Coaxial Traps for Multiband Antennas
The article is an analysis of an antenna trap where a coil is formed of a length of coax cable
Antenna PET Windom 10-80 m
Designed for this coverage we start with a 42/1 wavelength on the lowest band
NVIS antenna 80m-40m-30m band
Portable antenna for 80 m - 40 m - 30 m band. Radiant up to a radius of approx. 300 km. 100 watt CW max. - 50 ohms, coax balun
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Directivite de cette antenne 20 a 90 suivant longueurs de fil utilise Le gain en puissance varie de 15 a 60, L'impedance de l'antenne varie de 650 a 700 ohms, Pres d'un tiers de l'energie est consomme par la resistance terminale de 800 ohms non selfique
La Morgain e' un'antenna a struttura elettrica simmetrica, con un valore d'impedenza di circa 50 ohm
The article is an analysis of an antenna trap where a coil is formed of a length of coax cable
Designed for this coverage we start with a 42/1 wavelength on the lowest band
Portable antenna for 80 m - 40 m - 30 m band. Radiant up to a radius of approx. 300 km. 100 watt CW max. - 50 ohms, coax balun
23cm Yagi Antenna building Finished antenna at 1275 MHz SWR under 1:1.5 at resonant frequency
50 MHz preamp Gain 26dB with the BFG135 Preamps for 144 and 430 MHz, for 50 MHz, the BFG135a is a cheap transistor and in my view rather strong. It is not easily damaged by static discharge or RF power. FG connection
30 Volt Computer Power Supply Stack A bonus was that i discovered that these did not need a standby load connected to the supply to keep them running just apply mains power and close the Start lead to ground