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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 20 Jul 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
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