Wow, the difference Raphael found using two types of Litz wire wound on
the same Stormwise Ferrite bar is stunning, even accounting for the
vagaries of the Palstar R30A S-Meter (I own one). Can anyone elaborate
on exactly why this performance difference is so large?
On Wed, 2011-07-20 at 21:50 -0400, D1028Gary@... wrote:
> Hello Jerry and All,
> Steve Ratzlaff discovered that 660/46 Litz wire was the best performer
> for FSL's, and I agree with him completely. All of my FSL's have been
> made with 660/46 Litz wire from the eBay seller "Mkmak222," and they
> have all been hot performers. The reason why such large Litz wire isn't
> used on the 7.5" LW loopsticks is because the 660/46 wire diameter is
> too large to get enough turns on the ferrite bar for a coil inductance
> of around 1700 uh. A 7.5" long ferrite bar is too short for winding
> such a 1700 uh coil with 660/46 Litz wire, but an 18" Stormwise bar is
> long enough. Even using the 100/44 Litz wire from "Mkmak222" on the
> 7.5" LW loopsticks practically uses up the entire length of the ferrite
> bar with Litz wire, except for just enough space to attach rubber shock
> 73, Gary
> -----Original Message-----
> From: Pollock,Raphael E <rpollock@...>
> To: 'ultralightdx@...' <ultralightdx@...>
> Sent: Wed, Jul 20, 2011 3:41 pm
> Subject: RE: [ultralightdx] Which Litz Wire (660 / 46 or 100/44) is
> BetterTo Order for 7,5 Fixed Loop?
> Hi Jerry! I have used both 100/44 and 660/46 Litz wire to wrap a 38
> turnprimary winding on a 19” 125 mu ferrite bar, terminating in a 365
> pfdvariable capacitor for tuning the MW band. In this context the
> difference in Sunits as measured on my Palstar R30a was typically 7 vs
> S+30 for most stations.There were many stations barely audible with the
> 100/44 coil that could bereally well heard using the 660/46 wrap. I
> don’t know if this wouldtranslate into comparable results with a FSL
> antenna set up but it sure makes adifference with monster ferrite bar
> antennas that only have one ferrite rod,albeit one that is 19” long x
> 1” wide… From:ultralightdx@...
> [mailto:ultralightdx@...] On BehalfOf jerry_popiel
> Sent: Wednesday, July 20, 2011 5:34 PM
> To: ultralightdx@...
> Subject: [ultralightdx] Which Litz Wire (660 / 46 or 100/44) is
> BetterToOrder for 7,5 Fixed Loop?
> I am about to order some Litz wire from theUSA. Re Steve's recent Litz
> wire comments on his FSL Loop and Gary' use of iton his FSL Loops, does
> the much more expensive 660 / 46 Litz wire provide muchbetter
> sensitivity than the 100 /44 wire listed in Gary DeBock's June
> 11writeup for the 7.5 inch Fixed Ferrite Loop? And if the 660 /46 Litz
> Wire isbetter would the 7.5 Inch Loopstick still be required to have
> 122 Turns &1700 uh Inductance as was for the 100 /44 wire, or does this
> all change?
> Any comments would be much appreciated.
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