Re: [TCML] Re: Grounding NSTs (Special Case?)

[Brandon Hendershot <brandonhendershot@xxxxxxxxx>]

Alright, that makes good sense now. Thank you.

Your concerns about a roque streamer connecting the primary coil to the
counterpoise... is 'personal safety' the only objective in connecting the
counterpoise to safety ground? The reason I ask; I avoid the counterpoise
like the plaque. I treat it as 'hot' just like everything else down the
line from the control panel. I don't intend to suit up in chainmail
connected to the counterpoise so I can go hurdle the thing. I'll be sitting
at the variac, far from the counterpoise.  Under those circumstances, would
there be any other benefit than 'personal' safety for connecting the
counterpoise to safety ground?

Thank you much,
Brandon H.

On May 1, 2013 6:29 PM, "Jim Lux" <jimlux@xxxxxxxxxxxxx> wrote:
>
> On 5/1/13 3:45 PM, Brandon Hendershot wrote:
>>
>> Connecting the secondary > to the counterpoise > to the safety ground,
why
>> use a dedicated RF ground at all if I'm just going to be pumping RF into
>> green wire ground?
>>
>
> Since you don't have a separate RF ground, all you need is the
counterpoise.
>
> What you want to do, though, is make sure that you aren't inadvertently
having RF flowing "through" the greenwire ground.  That is, the safety
ground wire from counterpoise to "green wire" in the plug shouldn't be part
of the RF circuit.
>
> If you have a decent counterpoise AND any of your "strike targets" are
connected to that counterpoise or the cold end of your secondary (i.e. the
point where your coil connects to the counterpoise), then you aren't going
to be "pumping RF into the greenwire ground"..
>
> If you think you're having problems, you can put an RF choke in the wire
from green-wire to counterpoise, if you like. All you care is that it has
low impedance at line frequencies.. if your coil is running at, say,
100kHz, and you want to have, say, 100 ohms impedance, then that choke
would need to be a few hundred microhenries.  Iron core is fine so that's
easy to come by. You just care that the DC resistance is small.   A few
turns through one of those ferrite cores used for interference reduction
might work (although most of those use a material suitable for VHF
frequencies)
>
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