Re: RSG Question

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

Original poster: "sundog by way of Terry Fritz <twftesla-at-uswest-dot-net>" <sundog-at-timeship-dot-net>

Hi David, All,

 As you increase the power, the time the caps need to charge goes
down, so they'll appear to be further from the stationary
electrodes when they fire, due to the cap reaching the breakdown
voltage earlier.  As you reduce current, the opposite happens, and
the electrodes appear to get closer together.  On an async system,
this is no big deal (especially with a polepig), but on a sync
system with an LTR cap, this poses some interesting problems.  You
want the gap to fire at optimum cap voltage, but your firing point
changes as you increase current.  With only 4 electrodes for
120bps, the adjustment of the gap becomes crucial to the coil's
performance.  John Freau posted a very good method of giving ~90deg
of adjustment to a sync gap.  I believe his work will prove
invaluable to those running large caps on big coil systems.
                                    Shad
-----Original Message-----
From: Tesla list <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Wednesday, December 13, 2000 8:14 PM
Subject: RSG Question


>Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<Tesla729-at-cs-dot-com>
>
>Hi All,
>
>I have a question regarding my ARSG for my big coil. I notice
while
>watching the rotory electrodes appear nearly stationary, due to
the
>strobing effect of the SG, that they appear to slightly change
position
>gradually as I turn up the power. In other words, if the motor is
turning
>CW and the rotory electrodes appear stationary at a constant
input,
> when I turn up or down the voltage, I notice that the rotory
electrodes
> appear to slightly move CCW when I raise the voltage, and back
>CW when I reduce the voltage. The apparent movement of them is
only
>maybe 2 or 3 degrees of angle from min firing voltage to max
voltage.
>Comments? I hope that I explained this where it could be
understood.
>
>Keeping 'em Sparking in Memphis,
>David Rieben
>
>
>
>