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Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
I'm just waiting for the cat to knock things over >.<
I WAS trying to find the AC resistance of the coils and make some logical sense out of it, but its just too dammed non-linear and my sample set isn't large enough now, so I think I'm going to have to give up on that.
I think I will be able to predict how much Cself falls when loaded with a toroid though. I haven's started working on that part just yet, but I have the data and have to see if I can make sense out of that too.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Hazmatt, Paul Nicholson's GEOTC algorithms should predict the change in Cself, since they use proper finite element analysis methods rather than the cookbook formulas every other calculator uses.
CT2, my swingarm cracked I took it to a friend who TIG welded on a large gusset. I don't have the facilities to heat-treat it properly though, so I'll just have to see how it goes.
Avalanche: Looks pretty dangerous if you're allergic to batteries :P
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
I found this beautiful, huge fluffy moth trying to sleep in my garage. I never seen such a kind of moth here; he has wingspan of like 7-8cm. I thought it is a small bat when I first seen it, it's wing beat can be heard.
Those new cameras have such a great macro mode... (my cousin's C5060).
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
Secondary coil MADNESS! ! O.o !
Hers's the coil I frequency swept, there are no really $$ toys for Hazzy yet because he's unemployed, so.... have to do things the old fashioned way, function generator, paper, pen, and voltage readings.
coil 5
Coil 5 unterminated.
Coil 5 ground terminated.
I'm going to evaluate both modes to try to satisfy my curiosity about the open/short filter characteristics of the coil. I know what one of the equivalent circuits looks like from the ARRL handbook, but the graphs will hopefully help me determine the exact values of the parasitics which will lead to a more accurate model of the coil as a system and not just a simplified model.
********* Little bit of progress.
Second system simulated well with the calculated value for the shunt capacitence of 519pF with the coil 26.5mH, Rdc 50R. The simulation is not quite as steep as the measured, but there are variations in the generator output as well as the probe output, so I think its pretty close.
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I took it to a friend who TIG welded on a large gusset. I don't have the facilities to heat-treat it properly though, so I'll just have to see how it goes.
