[TowerTalk] Another way to make a CM choke ?

[David Gilbert]

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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