[NJARC] NJARC Digest, Vol 111, Issue 11

Al Klase ark at ar88.net
Wed Jul 17 21:53:53 EDT 2013 

Henry,

I've known, or at least known of Dave Schmarder, for a long time via the 
internet crystal set community.  He does some really creative things, 
and I like his website a lot.  However, he seems to be obsessed with 
litz wire.  I guess he bought a bunch of it.

Anyway, the whole point of a regenerative receiver is that you feed 
energy back from the output of the amplifier into the tuned circuit to 
cancel out the losses in that circuit, giving you the ability to achieve 
infinite Q and the resulting oscillation.  So whether you use litz wire 
or not is probably a mote point.  Forget all that claptrap about 
amplifying the signal over and over.  What you're doing is introducing a 
negative resistance into the tuned circuit to cancel out the unavoidable 
resistive losses.  (Come down to the Armstrong Days affair at InfoAge on 
the 27th or 28th and get the whole scoop.)

If you give me a link to the particular Schmarder radio. I'll second 
guess it further.

Regards,
Al

On 7/17/2013 3:35 PM, Henry Sonntag wrote:
> Just remember
> Reply = Poster
> Reply All = Everyone
>
> _________________________________________________________
> 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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>> _______________________________________________
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>> Today's Topics:
>>
>>     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
>> ____________________________________________________________
>> 30-second trick for a flat belly
>> This daily 30-second trick BOOSTS your body&#39;s #1 fat-burning hormone
>> http://thirdpartyoffers.juno.com/TGL3141/51e593b0f3dc313b06e05st03vuc
>>
>> ------------------------------
>>
>> 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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-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

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