On 10/16/2012 11:27 AM, Robert Mcgraw wrote:
Balanced feed systems are really quite easy to install and use and are
proven to be the highest efficient means of transferring RF.
Substitute the words "high impedance" for "balanced" and I'll agree with
that. Two-wire lines do NOT make a system balanced. Most REAL antennas
have some degree of imbalance, and that makes the feedline prone to
common mode current. Antennas are unbalanced by their surroundings --
trees, buildings, the nature of the earth under them, ground slope,
unequal heights, and unequal lengths. Antennas fed two-wire line need a
serious common mode choke just as much as those fed with coax.
73, Jim K9YC
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|