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Re: [TCML] RSG grounding

Hi Steve,

Yes - very definitive thoughts!  The RF ground should not be connected to
anything that doesn't have bullet-proof high voltage insulation to the
mains.  Despite the connection to what is hoped to be an absolute ground,
there exists very high voltage transients on the RF ground node, relative
to the mains and everything else not in the TC circuitry, particularly when
there's a streamer connection to the RF ground. I've never heard of any
discussion on how to measure the RF impedance of an RF ground, but I
suspect it's pretty high.  I once fried a lamp dimmer used to throttle
power to a blower for my spark gap, and I had the metal case tied to RF
ground.  It's understandable to want to protect the motor from a strike - I
would recommend doing that with an RF-grounded target between the motor and
the likely direction of incoming streamers.  Let the motor case just float.

Regards, Gary Lau


On Fri, Aug 11, 2017 at 1:09 AM, Steve White <steve.white1@xxxxxxxxx> wrote:

> Does anyone have any thoughts on connecting the RSG motor housing to the
> RF ground? This is my current set up. What I am trying to protect against
> is the possibility of a streamer hit or an accidental connection to the
> primary tank circuit to the motor. It seems that without the RSG housing
> being connected to RF ground, any streamer strikes to the motor could
> couple an extremely high voltage back into the house wiring via the 120
> volt power line for the motor. On the other hand, since my strike rail is
> also connected to the same RF ground, any deficiencies in the RF grounding
> rod resistance to the ground could result in the streamer strike going
> through the motor anyway because of a lower impedance path.
> I should mention that I have been running with the RSG motor housing
> connected to RF ground with no apparent ill effects to the motor even
> though I get a lot of hits to the strike rail.
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