Posted by
Bob McGraw - K4TAX on
Jan 07, 2019; 3:03am
URL: http://elecraft.85.s1.nabble.com/KAT-500-and-open-wire-tp7647776p7647807.html
I agree with Jim on this point. I have means to measure current in
each side of the balanced feed line. And I have means to measure the
voltage on each leg and observe the phase difference in each leg. A
dual trace scope with 2 current probes is the basic configuration. If
the currents are equal in each leg, and the voltage is equal in each
leg, and the phase is 180 degrees between the two legs, the system is
well balanced.
As I stated earlier, random installation of an antenna and feed line
will likely lead to random and usually unfavorable results. Otherwise,
careful installation and positioning of the antenna legs and feed line
run produces wonderful results.
73
Bob, K4TAX
On 1/6/2019 8:12 PM, Jim Brown wrote:
> A few other points: 1) the SWR on a feedline is established BY THE
> ANTENNA, not the transmitter or antenna tuner; 2) feeding an antenna
> with two-wire line does NOT make it balanced -- most practical
> antennas that we think of as balanced are often un-balanced by their
> surroundings -- ground slope, variations in the soil under them,
> trees, wiring in buildings, unequal height ; 3) off-center-fed
> antennas are inherently unbalanced.
>
> 73, Jim K9YC
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