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Calculate the frequency/length of antennas


Frequency in mhz half wavelength in feet, half wavelength in inches, quarter wavelength feet, quarter wavelength in inche
post 14 Feb 2024
Calculate the frequency/length of antennas

Antenna Calculator Links

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Impedance Calculators
These calculators are used by Mantaro engineers and provided freely for your use

J-pole antenna design calculator
For 2 meters, the coil is 4 turns of coax at 5 inches in diameter

J Pole Antenna dimension calculator
The J Pole antenna is a simplified version of the Slim Jim antenna, using the same matching stub principle

Log periodic dipol array
Detail of the end-fed feed of a VHF log periodic dipole array


23cm Yagi Antenna 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

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

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