RE: [TCML] Main ground vs RF ground

["chuck" <asimov@xxxxxxxxxxxx>]

"But since you are asking about NST's and the Terry filter, 
if you are running a single low powered NST with a Terry Filter, you may 
not have too many issues to be concerned about, but if you are running 
multiple NST's, I would consider a separate RF ground to be safe... "

Would I be correct to infer that using separate RF and mains grounds would
the more conservative way to go? That is, while I run a low risk using a
common ground with one or more NSTs, that risk is reduced if I use two
grounds: a mains ground and an RF ground? If so, I need to alter my Terry
Filter.

Shouldn't somebody issue a pen and ink change to the Terry Filter schematic?





-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of BunnyKiller
Sent: Thursday, November 19, 2009 12:17 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Main ground vs RF ground


Hey Chuck...

In the majority of instances, the RF ( or secondary base wire) should 
have its own "RF" ground rod. Hooking the secondary base to the "house" 
ground can lead to problems with items that contain circuitry boards... 
and thats about everything as far as appliances go... computers, ovens, 
stoves, refridgerators, garage door openers,  touch lamps ( the kind you 
touch to turn on) will eventually fall prey to the wrong grounding 
techniques. But since you are asking about NST's and the Terry filter, 
if you are running a single low powered NST with a Terry Filter, you may 
not have too many issues to be concerned about, but if you are running 
multiple NST's, I would consider a separate RF ground to be safe...  
Replacing the stoves controller board isnt cheap... ask me how I know 
about that one ;)

There are some instances in which the NST is wired with the case ground 
on the center tap of the unit... IIRC grounding the case and secondary 
becomes "weird"...
not too sure about this situation....  see if someone else has that answer.

Scot D


chuck wrote:

>Some coilers say that the NST may be grounded to the mains ground and 
>that the secondary of the TC should be grounded to RF ground and 
>emphatically declare that the two should never meet. Others say ground 
>is ground and it doesn't matter where the unit is grounded as long as 
>it is grounded. The famous schematic of the Terry Filters shows the NST 
>and the TC sharing a common ground.
> 
>So which is it? Should the Terry Filter schematic be altered? Or not? I 
>hope for first lights by Thanksgiving so I need an answer ASAP.
> 
>asimov13647@xxxxxxxxxxxx
>Stuck in the (now infamous)
>23rd NY Congressional district
> 
>_______________________________________________
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>


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