Re: Shrink wrapped secondaries

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Paul,

I just got this.  The list was down but it's going again.  Posts all backup
up for awhile...

At 10:38 AM 9/9/2002 +0100, you wrote:
>Terry wrote:
>> I moved some of the boxes and such out of the way and repinged it:
>> http://hot-streamer-dot-com/temp/02090701.CSV
>
>Gives:
>
>PK  FREQ kHz (Error +/-)    Q FACTOR (Error +/-)   LEVEL
> 1  351.735 (0.01%,35Hz)     297.08 (0.17%, 0.5)  -0.3dB
> 2  872.299 (0.01%,87Hz)     255.28 (1.17%, 3.0)  -14.1dB
> 3 1263.252 (0.01%,126Hz)    192.63 (1.66%, 3.2)  -21.4dB
> 4 1598.432 (0.01%,160Hz)    147.94 (6.64%, 9.8)  -25.7dB
> 5 1905.136 (0.01%,191Hz)    117.28 (15.79%,18.5) -28.7dB
> 6 2198.658 (0.01%,220Hz)     95.57 (31.58%,30.2) -28.0dB
>Accounted for 97.26% of input signal
>
>    Before     After
>f1  351.16     351.735 
>q1  275.08     297.08
>
>A worthwhile increase in q1 there.  Those boxes must have been
>soaking something up.  q3 went up a little, and the higher mode 
>q factors stayed about the same.

I wonder if "cardboard" and humidty just don't mix.  There was some foil
covered plastic in one of the boxes too...

>
>All the higher mode frequencies dropped a little.  Opposite to what
>I'd expect - again!   There's something funny about this coil.
>
>It might be an LGE (little green elve) effect, or it could be that
>the ends of your tube are sealed to give an airtight tube and the
>variations in ambient pressure are causing the tube to expand/contract.

The tube is wide open on the end.

>
>The variation is too much to account for by temperature change alone,
>unless your temperature changed by more than about 30 degC between
>tests! 

Maybe 1 or 2C...

>Deformation of a sealed tube by varying pressure was not 
>factored out of the qvar results, which might explain a few things.

Is there a way I could run your Q program here?  If I had real time (or a
few minutes later time) I could fiddle with it and see if I can track
something down.  If I could read like the latest scope file off a floppy
and have it show the results (maybe store them back too the floppy too).  

The Sun computer is only a few feet away and it's floppy drive seems to
open the DOS disk and data files just fine.  I'll leave a few sample
TEK00000x.CSV files in the floppy drive.  If I can change one thing and go
test it right away, maybe I could track some of this stuff down.

Cheers,

	Terry

>
>--
>Paul Nicholson
>--
>