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7 element yagi-uda


The design of this Yagi-Uda antenna is not necessarily the most optimal design for bandwidth
post 31 Jan 2024
7 element yagi-uda

Antenna Calculator Links

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PHGR Calculator Power, Height, Gain and Beacon Rate
Online calculator will produce the text required to be put in your beacon string to display to others your PHGR

Quadrifilar helicoidal antenna Javascript on-line calculator
Design frequency MHz,Number of turns twist,Length of one turn,wavelengths,Bending radius

RF Toroid Inductors
Specs for T200-2 RF Toroids

RF Tools calculator
Enter the frequency of operation and the balanced and unbalanced Z0.Values for L and C will be calculated


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