3 Elements 40m full size U Antenna
In my last Blog I wrote about my Antenna 3 el. Yagi for 40m. >>> We now come to my projects, work is progressing, but before coming to the realization of 160 m. and resettlement of four 80m phased vertical dipoles on second tower, I put in place to change my antenna PKW 3 elements Yagi for 40m. this is a loaded antenna, which also worked well, but only in the CW portion, covering about 7000-
A final point on this antenna when there is strong wind, obvious that the dangling wires are moved by the wind causing a slight variation of the characteristics, however of small entity, in my case in this respect I feel lucky, the wind is not a constant factor in this area, however, even when the wind is present even strong, I have no trouble making DX QSO.
10 October 2010 added comments
Job is fully done, Antenna now is up and working of love, this was a very rewarding job, the antenna works very well, the results after a short trial period are flattering, gain 7/8 db, front to side 30/35 db, 20db front to back, its impedance is found to be 25 homs, and advice to everyone in a situation like mine to proceed with the improvement, in particular to the holders of the 40m antenna PKW. 3 el. loaded Yagi, after trial and error, the Antenna the was tuned at 10 m. on the ground, on frequency of 6.850 MHz, elevating it to the end position at 25 meters, the center band moves to 7080 and covering 7000/7200, indeed even more.
Here down two photos, one with data and measures, the other you see the antenna with the change, low to the ground.
Looking at the schematic of antenna is clearly seen the uneven length of aluminum tubing, which is why I had to keep a certain length setting to climb as in the original antenna, because my tower being very close to home, when I get off the antenna, i must direct it south east in a way that the elements do not touch the house gutter and allow me to go ashore without the antenna problems.
Well I think I have said all, many thanks for brouse my web site, Good Luck and Good DX' ing de IK1MNJ Enrico.