[TenTec] Model 238C Tuner Questions

[Jim Brown]

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