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Feeding a Folded Dipole Antenna
If you play with the numbers, and get the input impedance down to 200ohms, you'll need a 4:1 balun to feed it from 50 ohm coax
post 15 Mar 2024
Antenna Calculator Links →
Loop antenna resonant frequency calculator
The simple calculator below uses the well-known standard formula for determining the total wire length in feet for a single element
Logarithmic Periodic Dipole Antenna Calculator
The javascript starts with the minimum value of = 0.76. If a solution could be found, is increased as long as the length of the boom
Magnetic Loop Antenna Calculator
Magnetic loops or mag loops, can give surprisingly good performance when they are carefully designed and constructed
Parabolic dish calculator
Complete all white boxes and then click the calculate button to obtain results in the green boxes
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The simple calculator below uses the well-known standard formula for determining the total wire length in feet for a single element
The javascript starts with the minimum value of = 0.76. If a solution could be found, is increased as long as the length of the boom
Magnetic loops or mag loops, can give surprisingly good performance when they are carefully designed and constructed
Complete all white boxes and then click the calculate button to obtain results in the green boxes
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