[TenTec] OT: Question to the group -tuner and dipoles

[Steve Hunt]

A couple of observations:

1) It would benefit from an effective ferrite-cored choke balun at the 
input rather than the narrowband air-cored balun that he suggests.

2) Apart from the balun, the CM performance is critically dependent on 
symmetrical construction of the matching components. If you force 
current balance at the input using the balun, but then have asymmetry in 
the following matching components, you will guarantee asymmetrical 
currents at the output terminals. The very worst example I have seen of 
this is the Palstar BT1500A where on the higher frequency bands they 
switch out most of the rotor vanes but leave the static vanes in circuit 
and close to the chassis!!!! As you might imagine the CM impedance turns 
out to be mediocre.

Steve G3TXQ

On 19/07/2016 13:22, Steve Elliston wrote:
> do we like:
> "A *Balanced* Balanced Antenna Tuner
> By Richard L. Measures, AG6K
> The published version of this article appeared in the February 1990 issue
> of QST Magazine." ?
> 73
> Steve
> G3XKR
>
>
>