RE: Srike rail/tank circuit shield grounding

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Mudford, Chris by way of Terry Fritz <teslalist-at-qwest-dot-net>" <chris.mudford-at-agresearch.co.nz>

Hi Gary

When I talked a tank circuit shield I was meaning if the capacitor and
spark gap were sitting out to one side of the primary coil I was
envisaging having a flat sheet of chicken wire or equivalent sitting
over the top to stop any arc to that gear.

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Sunday, 26 January 2003 5:16 p.m.
To: tesla-at-pupman-dot-com
Subject: RE: Srike rail/tank circuit shield grounding


Original poster: "Lau, Gary by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<Gary.Lau-at-hp-dot-com>

The first question about the counterpoise and strike rail is tricky, I'm

not sure.  Strikes really should go to a good ground.  Tank circuit
shield?  I've not heard of this.

On your question about the distance between the primary coil and the
tank
circuit - the tank circuit is comprised of the capacitor and primary
coil
(and spark gap).  So I'll assume you're just asking about how long the
interconnections between these 3 components can be.  On my 4kv/20mA
powered
mini coil, I originally lashed it together with maybe 2-3 feet of
wire.  When I tidied it up, reducing the interconnections to under 1
foot,
performance increased an inch or two.  Definitely worth doing.

I doubt that a fan motor would be affected by being close to the primary

coil, unless it's a DC motor that uses Hall-effect sensors and other low

voltage electronics.  3-4 inches should be fine for an AC motor near a
small primary, preferably off to one side.

Regards, Gary Lau
MA, USA

  >Original poster: "Mudford, Chris by way of Terry Fritz
<teslalist-at-qwest-dot-net>" ><chris.mudford-at-agresearch.co.nz>
  >
  >It is my understanding that the strike rail and shield for the tank
 >circuit are to be connected to RF ground.  If this is indeed the case,
 >if using a counterpoise are the before mentioned still connected to the
 >counterpoise?  >  >Also, although wanting to keep the distance from the
tank circuit to the  >primary coil short, how long can this
realistically be on a small 6 kV  >30 mA coil.  On the same coil if one
decided to mount the tank circuit  >beneith the primary coil what sort
of clearance is required and would a  >fan motor on the spark gap be
affected?  >  >Thanks for your help.  >  >Chris.