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RF Impedance Matching Calculator


RF Impedance Matching Calculator

Calculates the network to match a line to a specific complex load

post 22 Sep 2024


Antenna Calculator Links

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AM Loop Antenna Calculator
Below you will find plans to build a three or four foot box loop for the AM broadcast band

Design Your Own Dipoles And Inverted Vees
The formula for these types of antennas vary from about 476/f Mhz to 490/f MHz depending on the band and the height above ground!

Double Extended Zepp NVIS Antenna Calculator
The measurements below are for building a Double Extended Zepp Near Vertical Incident Skywave NVIS Antenna


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