[Elecraft] 9:1 Balun

[Don Wilhelm]

Kev and all,

A voltage "balun" can be tapped to produce a wide range of impedance 
transformation possibilities, but the voltage balun will have no effect 
on the problem of RF on the outside of the coax shield.
The modern consensus is that only common mode chokes should be used on 
the feedline.  They should have enough inductance at the frequency of 
interest to keep the RF off the outside of the coax.

See the works published by Jim Brown K9YC for a thorough discussion of 
RFI and "baluns" (common mode RF Chokes) for use in the amateur 
community - http://audiosystemsgroup.com/RFI-Ham.pdf.

73,
Don W3FPR



On 1/31/2017 8:35 PM, Kevin - K4VD wrote:
Can a BALUN be tapped maybe? It seems it would extend the range of
> internally antenna tuners also. I should know this stuff. But I don't.