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Re: Secondary Research (fwd)



---------- Forwarded message ----------
Date: Mon, 3 Mar 1997 20:00:39 -0500 (EST)
From: richard hull <rhull-at-richmond.infi-dot-net>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Secondary Research (fwd)

At 08:30 PM 3/2/97 -0700, you wrote:
>
>
>---------- Forwarded message ----------
>Date: Mon, 3 Mar 1997 11:39:31 +1200
>From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
>To: tesla-at-pupman-dot-com
>Subject: Re: Secondary Research (fwd)
>
>Hi Richard, all,
>                You wrote in reply....
>
>> Finding the actual RMS watts into a TC is not all that trivial or easy!  A
>> time integration method is a must.  Most amateurs are not really equipped
>> for this.
>> 
>> Second, the actual setting of the static gap is hyper critical and variable
>> at best, if true peak firing on the AC sine is demanded. (but could in
>> theory be accomplished).  I usually run my static gaps to fire at the 707
>> point on the sine. This gives me at least two pops per half cycle but
>> sometimes as many as 4 with the same gap setting (quench variability uneven
>> discharging, circuit losses, etc).  This is real tough to figure for in real
>> life.  Firing point moves along the cycle and even multiplies on occassion.
>> I find about 5% of the time I get 4 pops/sine (half cycle) and about 25-30%
>> of the time I get 3.  All the rest are two popers and are never symetrical
>> about the wave.
>
>Fair comments all. In fact using peak voltage and repetition for 
>calculating input primary power is only useful for a static gap and 
>then only as an approximation as gap spacing is usually not ideal
>as you say. I was using such measures as a comparison only. 
>Nevertheless, it was in those particular systems that I noticed that 
>utilization appeared to be rather poor when compared to the stated 
>power inputs. Perhaps power inputs quoted by some are actually VA. It 
>also suggests that rotary gaps are probably better at utilizing 
>available power. 
>
>Thanks for the input,
>Malcolm
>
>
>Malcolm,

I try and quote my coils in VA, unless I have zero power factored smaller
systems (under 200 watts) and use a RMS watt meter in the circuit where true
power readings are more likely to be nearly correct.  (still not perfect though)

Richard Hull, TCBOR