[NJARC] NJARC Digest, Vol 111, Issue 11

Wed Jul 17 15:35:14 EDT 2013

I am about to build a one tube regen for the AM broadcast band. I found the
design on the web. The author (D. Schmarder) specifies 40/44 Litzwire for
the tuning coil. I understand now from the posts that this type of wire is
better as it provides a higher Q. For a XTAL set this may be important.
It's not clear to me that Litzwire is needed in the case of a regen. If any
one has experience with this wire in a regen. I would like to have you
opinion.

Thanks,
Henry W2HES

On Wed, Jul 17, 2013 at 12:00 PM, <njarc-request at mailman.qth.net> wrote:

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> Today's Topics:
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>    1. Litz wire (kd4hsh at juno.com)
>    2. Re: Litzwire (Al Klase)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 16 Jul 2013 18:39:59 GMT
> From: "kd4hsh at juno.com" <kd4hsh at juno.com>
> To: njarc at mailman.qth.net
> Subject: [NJARC] Litz wire
> Message-ID: <20130716.143959.19553.0 at webmail13.vgs.untd.com>
> Content-Type: text/plain; charset=windows-1252
>
> You will find it on eBay.... It is used as a work-around to the problem of
> 'skin effect' in a conductor at high frequencies. Many small gauge film
> insulated strands bundled into a larger size... For example 22 AWG hookup
> wire will have 7strands not insulated... Some Litz wire the same outside
> diameter can have 40 - 60 or more strands. The effective series resistance
> at very high frequencies can be much less. It seems the crystal set
> builders go nuts for Litz wire in their AM tuners even though the advantage
> at that frequency is very small. Robert
> ____________________________________________________________
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> ------------------------------
>
> Message: 2
> Date: Tue, 16 Jul 2013 20:55:03 -0400
> From: Al Klase <ark at ar88.net>
> To: njarc at mailman.qth.net
> Subject: Re: [NJARC] Litzwire
> Message-ID: <51E5EB67.5030905 at ar88.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Hi Henry,
>
> Robert L. told part of the story.  I'll fill in a bit more.  E-bay is
> generally the only reasonable place, as you'd be fighting minimum order
> requirements if you go to a manufacturer.
>
> The size of the wire is given by a pair of numbers like 175/46. That's
> 175 strands of #46 enameled wire.  The size of the individual strands is
> targeted on a particular frequency range.  #44 or #46 is what you want
> for the broadcast band.
>
> As a long-time crystal set builder, I remain unconvinced about the real
> world advantages of having a coil with a Q of 1000 versus the 200-300
> that attainable with normal wire.
> See my article here: http://www.skywaves.ar88.net/Coils/Coilwiz.html and
> the main xtalset page: http://www.skywaves.ar88.net/xtal/xtal.htm
>
> What are you up to?  If you've never played with a high-performance
> crystal set,I suggest that you keep it simple by buliding a PGSX Mark
> II, and then adding the "Front End" tuner to make it a really good
> crystal set.  Not a lot of expense or complication, and then you can use
> it as a point of comparison for further development. It's likely better
> than 99.99% of all the crystal set ever built.
>
> Have fun,
> Al
>
> On 7/15/2013 5:39 PM, Henry Sonntag wrote:
> > Just remember
> > Reply = Poster
> > Reply All = Everyone
> >
> > _________________________________________________________
> > Hi,
> > Can someone tell me what Litzwire is and how to get some of it. Better
> yet,
> > what is a good substitute?
> > Anyone know of a local source fro Q-Dope or a good substitute?
> >
> > Henry Sonntag W2HES
> > ______________________________________________________________
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> --
> Al Klase - N3FRQ
> Jersey City, NJ
> http://www.skywaves.ar88.net/
>
>
>
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> End of NJARC Digest, Vol 111, Issue 11
> **************************************
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