Hits
Origin and principle of the HB9CV antenna
Simplicity in terms of its performance, equivalence with a Yagi antenna, optimally sized, three elements with wide spaced, or four elements with close spaced
post 29 Jan 2024
Antenna for UHF VHF Links →
Antenna yagi-5-el-144-mhz
Gli elementi devono essere isolati dal boom, pertanto il boom deve essere di un materiale isolante, l'adattamento di impedenza ai 50 Ohm ho usato un balun 4:1
Antenna tribanda 6 - 2 metri e 70 cm
Questo tipo di antenna, e' tribanda operante nelle gamme dei 6 metri, 2 metri e 70 cm
Antennas biband 144mhz 440mhz Collinear
I started with 3/'' and 1/2'' fiberglass tubing from Max-Gain and 0.79'' and 0.59'' aluminum antenna stock from MFJ
Antenne HB9CV 2m 144Mhz
A gain of about 15 dB and lateral dips from -30 to -40 dB from the front.In VHF, the size of a 3-wave half-wave antenna is 1 meter wide by 60 centimeters long against 30 centimeters long for HB9CV
Antenne Speciali HF VHF UHF
Un dipolo VHF 145 MHz invisibile abbinato ad una radio palmare
155
Gli elementi devono essere isolati dal boom, pertanto il boom deve essere di un materiale isolante, l'adattamento di impedenza ai 50 Ohm ho usato un balun 4:1
Questo tipo di antenna, e' tribanda operante nelle gamme dei 6 metri, 2 metri e 70 cm
I started with 3/'' and 1/2'' fiberglass tubing from Max-Gain and 0.79'' and 0.59'' aluminum antenna stock from MFJ
A gain of about 15 dB and lateral dips from -30 to -40 dB from the front.In VHF, the size of a 3-wave half-wave antenna is 1 meter wide by 60 centimeters long against 30 centimeters long for HB9CV
Un dipolo VHF 145 MHz invisibile abbinato ad una radio palmare
Take off angle of horizontal antenna For horizontal polarization, the electric field will move sideways on a horizontal plane, while for vertical polarization it will oscillate up and down on a vertical plane
Rx antennas 4Square Rx Vertical Array My frequency design of 1.825 MHz a 90 degrees line would be 33,70 metersinstead of the previously calculated 33,27 m
Calculo da Antena Bazooka A double bazooka antenna is a combination that has a complete coaxial wave multiplied by its velocity factor and a total end-to-end length of 1/4 wave for each side affected by another driver shortening facto