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Re: Many Things...

Hi Don,

At 02:16 PM 7/26/99 -0600, you wrote:
>At 07:25 PM 7/25/99 -0600, Tesla List wrote:
>
>>Original Poster: Terry Fritz <twftesla-at-uswest-dot-net>
>
>Hi Terry, All,
>
>>       I use 14 x 1800 volt MOVs on my neon protection circuit.  Running the
>neon
>>at 140VAC in was pretty hard on them.  It was interesting.  They get really
>>hot and the output of the coil dropped way down as expected.  However, when
>
>Do you have any pictures on your site of this protection circuit?

Not yet.  As it turns out I fried one side (7) of the MOVs.  The breakdown
voltages were all lowered to various values.  I'll simply replace them and
all will be well again.

>
>>on a curve trace or highpot to be sure...  The 1/4 inch ball bearing gaps
>>work very well and got plenty of testing today :-))  The gap width is 0.186
>>inch for each leg of the neon but the altitude here is 5300 feet so that
>>does not apply for most people at lower altitude.  The 50 watt 5K resistors
>
>Now that's an interesting point - Does high altitude make a significant
>difference for the gap setting?

The higher the altitude, the lower the breakdown voltage.  There are charts
of this around but I think the gap can vary about 10 or 15 percent in our
case due to the lower air pressure at 5000-8000 feet.

>
>You're at the top of the state, but I'm at the midpoint (Crestone, Sangre
>de Cristo mountain chain, 50 miles south of Salida) and the altitude
>here is 8000 feet. 
>
>I'm using  a modified RQSG with 11 gaps set at .030 using 1" copper 
>pipe sections, 4" in length. With the SG hooked directly to the 15/60
>NST, it fires pretty evenly at each gap. 
>
>I'm also curious what kind of grounding system you use for your coils
>in this rocky, dry soil of Colorado?

Water pipe.  Or, any metal going into the ground.  Along the front range
the ground is pretty wet as opposed to the east side of the state and it is
no problem at all.

Cheers,

	Terry


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>Don
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>---
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>"Resistance to tyrants is obedience to God" - Thomas Jefferson
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