A 12 m long antenna filar with a 1/9 balun

I used an old plastic box handy for this test Balun.On the red plug is attached the plug SO239 using rivets
post 17 Apr 2024
A 12 m long antenna filar with a 1/9 balun

Toroid & balun Links


Balun for yagi 144mhz
Balun yagi if coax type rg59/u is long 34,5 cm

Baluns on Log Periodic Antennas
This is the electrically ideal method of bringing the feed line back to the mast from the log feed. This method keeps the coaxial line away from the balanced transmission line formed by the boom. This works with ANY log periodic and good balun, including 200-300 ohm balanced systems

Coaxial balun
I used RG58 coaxial cable since I use less than 300 W power. Better is the use of the RG142 Coaxial cable with Teflon dielectric, which handle a power of 2 KW at 144 MHz with a lower loss also

End-Fed 160-10m Long Wire
diy 9:1 a un-un unbalanced to unbalanced transformer the heart of the un-un uses a type 43 ft240-43 core and consists of a trifilar 3 wire winding arrangement around the core

End fed long wire
I will try to share my experience with the end fed long wire antenna


Linear loaded short dipole 21Mhz For my amateur radio activities on the HF bands I only have a 3.6 m wide balcony available for antennas. After some study I decided to experiment with a shortened dipole for the 15 m band

Rx antennas 4Square Rx Vertical Array

Rx antennas 4Square Rx Vertical Array My frequency design of 1.825 MHz a 90 degrees line would be 33,70 metersinstead of the previously calculated 33,27 m

A simple SWR Meter is to be used at HF

A simple SWR Meter is to be used at HF An SWR meter provides information about how well matched is your antenna with the transmitter and how well power is being radiated