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

[Walter Underwood]

Oops, thanks for the clarification. I should have added “at the antenna”. After reading K9YC’s encyclopedic work (http://audiosystemsgroup.com/RFI-Ham.pdf <http://audiosystemsgroup.com/RFI-Ham.pdf>) four times, it has seeped into the lower neurons.

Maybe I should read it again.

wunder
K6WRU
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Sep 28, 2015, at 6:33 PM, Bob McGraw - K4TAX <rmcgraw at blomand.net> wrote:
> 
> 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.
> 
> 
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