Re: [TCML] Coil Volume and Others

[Gary Lau <glau1024@xxxxxxxxx>]

It makes sense that the safety gaps are more prone to firing at 120 than
240BPS.  Assuming you're using the same cap size, the cap has only half as
long to charge at 240BPS, so it won't get to as high a voltage.

I know what "TDC" stands for, but I'm not sure it has any useful meaning
relative to sync gaps.  You're not thinking that the rotational point when
mains voltage peaks is where the sweet spot should be, are you?  The correct
timing can only be determined experimentally, and will differ depending on
cap size and Variac setting.  Setting a sync gap phase incorrectly can
definitely result in safety gap firing.  As I recall you're still using a
relatively small-value cap in your Freau phase adjuster.  I strongly
recommend using something larger to allow you greater latitude in adjusting
the phase.

Regards, Gary Lau
MA, USA

On Fri, Jul 30, 2010 at 6:31 PM, Joe Mastroianni <joe@xxxxxxxxxxxxxx> wrote:

> Well, I tried 1.5 turns and that was a non-starter (literally).
> It's more like 9 turns of 1/4" refrigeration tubing, 1/4" apart,  to tune
> with 41nf, 22" of 26Ga wire on the secondary, etc.  At least, that's my
> empirical result.  Lemme try doubling up on the toploads.  I've got another
> (smaller) toroid.  I will try stacking.
>
> But I'm finding out  a lot of interesting stuff.  Like:
>
>  - My Terry Filter safety gaps fire when I have the SRSG set at 120bps and
> it's out of tune.    It does not fire when I have the SRSG set to 240bps and
> it's out of tune.
>  - I get arcing on the primary when I run at 240bps and the primary is in
> tune, but the SRSG is off TDC
>  - I do not get arcing on the primary when I run at 120bps and the primary
> is in tune but the SRSG is off TDC (maybe this is because the terry filter
> gap is firing)
>
>
> Because I have a persistent and driving need to construct things, I'm
> turning my propeller gap into an ARSG as I write this....  I suppose if I
> blow up my NSTs I'll just go build a DRSSTC.  I have one of Dan's kits
> sitting in the box in the corner, calling my name.
>
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