Jerry, Both the FD and bazooka on UHF/VHF antenna test use tubing with a large
diameters. This gave the antennas band width among other things.
The folded dipole had tubing on only one side.
The charts on the FD went off the scale with just wire on both half's and with
large spaced spreaders. Programs cannot adjust to it to give you any thing
accurate unless and accurate simulation is built, other wise your guessing on
its performance.
The crossed Double Bazooka will give you more band width I think 1.5 times more
than a dipole. Wide spaced FD about 2.0 times more than a dipole. Whats the
increased band width with the 2000pf cap and 3 foot cable combo compared to a
dipole?
Bazooka eliminates the use of a balun that matches a balanced antenna to
unbalance feed line makeing the DB a more reliable antenna. Normally you would
use a 6:1 balanced to balanced balun at the feed point of an FD and attach a
1:1 current balun to it. Too many pieces to fail for one reason or another.
Keep The Faith, Jim K9TF/WA9YSD
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|