[Elecraft] [BL1] Seems lossy in all useful configurations

[Vic K2VCO]

David Woolley wrote:

> The requirement that I'm trying to meet is that the K2 chassis not be RF 
> hot and that, if I connect the mains ground, there is no significant RF 
> in that ground.  RF choking the ground has the same problem that the 
> choke impedance will not be large compared with an off resonant antenna. 
>  That requires driving an antenna that is, at least approximately, 
> balanced - in reality it's not possible for me to get true balance, 
> because the antenna has to be indoors.

The usual solutions to RF on the chassis are 1) changing the feedline 
length (so that it is not close to an odd multiple of a quarter 
wavelength) and 2) connecting a quarter wavelength radial to the chassis 
to decouple it. Of course these solutions can be more complicated in 
multiband situations.

> In other words, you added a balanced tuner on the antenna side of the 
> balun!  I'll accept that there may be solutions that do coarse tuning on 
> the antenna side, to get the impedance into the right ball park, then 
> use the unbalanced tuner, on the equipment side, to do the fine tuning, 
> but what you are describing is still doing a lot of the tuning antenna 
> side.

OK, I'll accept that. I wasn't trying to prove a point about where the 
tuning takes place, but rather to suggest that reactance has a lot to do 
with balun efficiency and that the place to start when trying to match 
an antenna is by measuring the r and x so you know what the problem is.
-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco