[TowerTalk] Another way to make a CM choke ?

David Gilbert xdavid at cis-broadband.com
Thu Dec 14 16:12:18 EST 2017

I'm pretty sure some of the common mode choke approaches do exactly that 
... except using the stray capacitance between the shields of the turns 
to get the resonance.  I suspect there are websites showing the right 
configurations (number and diameter of the turns) necessary for 
resonance.  It's been a while since I read Jim's paper, but I think he 
mentions that approach as well.

Dave   AB7E

On 12/14/2017 1:32 PM, Jim Thomson wrote:
> Ok, for MONOband use only, what about a simple parallel resonant circuit, consisting of a solenoid coil of  50 ohm coax + parallel resonating fixed or variable cap, or padding a variable cap ?
> With cap wired between input and output braid.  On paper, this appears to be a  very high Z, and low Q device.  And wide enough to cover one ham band in question.   Is it doable ?
> Whats the optimum  L to C ratio  for this concept to work ?   IE; we would want the highest Z practical, but a Q such that the high Z covers an entire band, or portion of one band, or freqs of interest.
> Jim  VE7RF
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