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Folded Dipole Calculator
The impedance of this antenna is around 300 ohm, so you may want to use a transformer or a 1/4 long piece of 120 ohm coaxial cable to match this impedance to 50 ohm
post 21 Jul 2024
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The self-inductances are calculated
A variometer consists usually of two coaxial coils, connected in series, where the coils relative position can be varied in some way
7 element yagi-uda
With this JavaScript it is very easy and quick to calculate the dimensions of the Yagi-Uda antenna above.Enter the frequency in MegaHertz and press the button, the Yagi-Uda calculator will do the rest for
Log Periodic Dipole Array
Log Periodic Dipole Arrays, or LPDA is a directional antenna with relatively constant characteristics across it's wide frequency range
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A variometer consists usually of two coaxial coils, connected in series, where the coils relative position can be varied in some way
With this JavaScript it is very easy and quick to calculate the dimensions of the Yagi-Uda antenna above.Enter the frequency in MegaHertz and press the button, the Yagi-Uda calculator will do the rest for
Log Periodic Dipole Arrays, or LPDA is a directional antenna with relatively constant characteristics across it's wide frequency range
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