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4 el. Log periodic 144 Mhz - 430Mhz
Antenna bibanda per i 144 Mhz e i 430Mhz del tipo Log periodic a 4 elementi
post 14 Aug 2024
Antenna for UHF VHF Links →
Bi-Bande 144/432Mhz pour le trafic SSB
Details of the dipoles: that of the 144Mhz is actually a trombone recovery, with the impedance matching system on the top of the boom.
Cheap Yagi Antennas for VHF/UHF
Typically, a high gain antenna is designed in the computer, then you try to come up with a matching arrangement for a 31.9 Ohm
Construccion de una antena cubica para VHF
The cubic antenna is a dipole to which we have folded the ends to close it
Dipolo de 1/2 lambda con gamma match para 88-108 MHZ
This is a 1/2 lambda type antenna, typical with gamma match adapter, can be stacked to achieve greater gain, I am preparing the documentation for anyone who may be interested in building
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Details of the dipoles: that of the 144Mhz is actually a trombone recovery, with the impedance matching system on the top of the boom.
Typically, a high gain antenna is designed in the computer, then you try to come up with a matching arrangement for a 31.9 Ohm
The cubic antenna is a dipole to which we have folded the ends to close it
This is a 1/2 lambda type antenna, typical with gamma match adapter, can be stacked to achieve greater gain, I am preparing the documentation for anyone who may be interested in building
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