I took advantage of the small Easter vacation last weeks and installed two HF antennas at our countryside place, 10 km away from the city, where I spent most of the summer weekends. Like every spring, I reinstall my wire antennas in the big old cherry tree just before the leafs start to grow and make this job difficult. Except adding some masts, I cannot install hinged antennas in the courtyard other then the trees.
Dipole for 20M band. A 2 x 5 m Inverted V, with feed point at about 7-8 meters high.
I made this antenna first time in the same location two years ago. Worked fine JA and K with 5W. Last year I did a butterfly dipole, adding also a 2 x 10m of wire for the 40m band. I wasn’t very satisfied on 40, not so spectacular DXs. On 20 and 15, on the other hand I made my first South American contacts. Don’t know if the extra 2 x 10 m counted to much, but this year I decided not to add it anymore.
Quad Loop for 10M band
From the remaining wire I took one side of 10 m long and made this quad loop, vertical mounted, for the 10 M band. Each side is equal, aprox. 2.5 m each, hinged from a walnut tree.
Normally a quad loop has 100 ohms impedance, so I made a 2:1 balun. I could have live with that, and made the LDG Z-817 tuner do the job, but at my FT-817 having the extra BNC socket in the front panel I wanted to easily switch between the dipole (connected with Z817) and the Quad Loop (already tuned).
I used an Amidon T130-2 toroid for the balun, and wired, like in the diagram below, 6+6+6 wounds. Didn’t made any fancy box for it, just wrapped insulating tape all around.
Here is the loop being measured and marked the corners before putting it to its place in the tree.
Hope this small walnut tree branch to be able to hold the antenna this summer 🙂
Now waiting for the 10M season to arrive. Didn’t made any QSO yet with it, just a comparison when receiving between this and the dipole. The difference is quite remarkable. More noise silence and more gain, although in theory I found out that a vertical loop has about 1.2 dB gain over a dipole.