Re: [TCML] Coil Volume and Others

[Joe Mastroianni <joe@xxxxxxxxxxxxxx>]

Hi Gary,
Yes, I was doing exactly what you said had to be done experimentally.  I was calling TDC - Top Dead Center - like in an auto engine.  Though in cars you don't time for TDC, I was trying to do that, or something like it.  Though, I found it just doesn't work....

Onward and upward!
Joe

On Jul 30, 2010, at 4:40 PM, Gary Lau wrote:

> 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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