[Elecraft] [K1] Question about antenna tuners that I should not have to ask but do.

[Bob McGraw - K4TAX]

I would agree that a 1:1 balun is preferable in as much as a center fed 
dipole appears to have a balanced feed point while a coax feed line is 
unbalanced.  In addition, a common mode choke at the feed point is 
suggested.    For 100 ft of RG-8x at 14 MHz the loss is ~ 1.25 dB when 
matched.  Other than using a balanced feed system, which will much more 
complex to install, RG-8x is about the best way to go.  You may also 
find that a 2nd common mode choke at the radio will also be helpful as 
well.

The Balun Designs products work very well in this regard.  For Common 
Mode Chokes, in several applications I use a product from The Wireman 
being model #8232.  This is a 3' coax jumper with beads and is good for 
160M - 10M at near legal limit power.

73
Bob, K4TAX
K3S s/n 10,163

On 9/28/2015 7:40 PM, Walter Underwood wrote:
> A 1:1 current balun could be very useful at rejecting nearby common-mode interference. At my house, that dropped the noise floor by about 6dB.