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All band dipole Mk2
The All Band HF Doublet is often referred to as a random length dipole as it is generally as long as the available space within reason, but here are a couple of limitations to the ultimate dipole length
post 17 May 2024
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Building short trap dipole
a QST article for a short 40, 80 and 160 meter trap dipole, I decided to pursue construction of this antenna, and bend the 160 meter end wire, if necessary to fit into the yard
Antena para 40 e 80 metros tipo W3DZZ
This antenna is equivalent to a simple dipole in 40 meters, since the traps are equivalent to an insulator
Three Double-Extended Zepps
The antenna can also be powered with a 300 ohm TV two-wire line, but it is preferable that the power supply is via a stub
Windom
Adattare l'impedenza della discesa a 50 ohm con il valore tipico di questa antenna, che sia aggira intorno ai 300 ohm
Dual band Antenna 80/40 loaded coil inverted V
Antenna 40-80m, inverter "V" SWR results are quite good at 3.799
156
a QST article for a short 40, 80 and 160 meter trap dipole, I decided to pursue construction of this antenna, and bend the 160 meter end wire, if necessary to fit into the yard
This antenna is equivalent to a simple dipole in 40 meters, since the traps are equivalent to an insulator
The antenna can also be powered with a 300 ohm TV two-wire line, but it is preferable that the power supply is via a stub
Adattare l'impedenza della discesa a 50 ohm con il valore tipico di questa antenna, che sia aggira intorno ai 300 ohm
Antenna 40-80m, inverter "V" SWR results are quite good at 3.799
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