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  2. Guy Atkin's Independent Testing of PL-380 7.5" Loopstick

Re: Guy Atkin's Independent Testing of PL-380 7.5" Loopstick

Tony Germanotta
 

One of the things that used to be done in those air core loops was a basket weave using wooden slats to reduce that self capacitance. I used some extra slats from my wife's wooden blinds to make up two slats per side of my loops and wove them through. It does reduce self capacitance, in fact it seems to extend the upper end of the loop itself. 



On Feb 11, 2010, at 3:58 PM, jim_kr1s wrote:

 

Thanks for that link! Those are "basket-weave" coils. The method allows high inductance while reducing self capacitance, which could turn the coil into a stand-alone resonant circuit.

Doesn't hurt to kick around the old radio stuff, as that's where all the innovations we still use were made. A DSP chip only synthesizes what once took lumped components to achieve. To understand the new stuff you have to understand the old stuff. And after 100 years, we're still making antennas with Litz wire.

73,

Jim, KR1S
http://qrp.kearman.com/ 
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