Topband: Chokes, et. al. - what is the attenuation ?

[Richard (Rick) Karlquist]

On 7/14/2012 1:19 PM, donovanf at starpower.net wrote:
> I'm liking my current forcing, 1/4 wavelength and 3/4 wavelength coaxial baluns more and more!
>
> 73
> Frank
> W3LPL
>
>

On low bands, the Q of resonant stubs is fairly low.
Therefore, the effective common mode impedance of these
baluns will not be extremely high.  If you want a
single band choke, you could get a higher impedance
more easily by using a low loss ferrite like 61 or 67
to make a conventional common mode choke and then
resonate the choke with a shunt capacitor.  It also
requires a heck of a lot less coax than a wavelength.

Rick N6RK