Re: Terry Filter Tuning

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: otmaskin5@xxxxxxx 

Also seems off to me.  If I got my decimals in the right places my 
15/60 nst is rated at 900 VA or .9 kVA.  With a 4" secondary & a 
static gap, I get nearly 4 feet, sometimes close to 4 1/2 feet.  And 
I've heard of guys getting better than I'm getting.  Could be my math 
is in error?  Dennis Hopkinton MA


-----Original Message-----
From: tesla@xxxxxxxxxx
To: tesla@xxxxxxxxxx
Sent: Sat, 24 Mar 2007 10:16 PM
Subject: Re: Terry Filter Tuning

Original poster: Ed Phillips <evp@xxxxxxxxxxx>


I talking about the usual range of nsts, approx 1-3 kVA. With typical 
small dia coilforms, ie, 4-6 inches, usual production is around 1 
ft/kVA. With solid state around 1 ft/450 Watts.

Hope that clarifies it.

Dr. Resonance"

  That doesn't seem right to me either. I have a small coil here 
(secondary 3.15" diameter x 15" long, wound with #30) and a 14" x 3" 
toroid on top. It puts out 24" streamers to a grounded spherical 
doorknob with 6.5 amps line current (@120 V) to a 12 kV, 60 ma NST 
and based on comments here at the time I built it I didn't think that 
was particularly good performance. The cylinder gap uses four 
sections of 3/4" copper pipe couplings.

  I have a much smaller coil using a 2800 V, 20 ma NST which puts 
out pretty fat 4" streamers with about 150 watts (measured with 
electrodynamometer wattmeter) input and don't think that's stellar 
performance either.

Ed

P.S. I don't think quoting transformer ratings is much of an 
indication of power input when the transformers are operated as close 
to resonance as typical NST's are.



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