[Lowfer] My variometer resistance

[PAUL DAULTON]

Peter the 88 turns was the count by Andy I was trying to back calculate
 the length
and determine the wire ga( Andy wasnt sure) by comparing the length to the
 resistance
and looking at the tables . Closest I could come to res / 1000 ft was
 24awg. 
I want to build another "loaner beacon" to try and get another on in the
 state. This discussion 
gives me a head start. What I want to build is similar to what Andy has
 done. Having a starting place
is a great help. Anyone who can give dimensions and construction details
 of coils they have built
will be appreciated.
Peter I wonder what you are hearing on lowfer these days.
Paul k5wms
-----Original Message-----
From: "Peter Barick" <pbarick at niu.edu>
Sent: Fri, 24 Oct 2008 19:48:41 -0500
To: <lowfer at mailman.qth.net> 
Subject: Re: [Lowfer] My variometer resistance
 
 
Gents,  
 
Hmm, I have another take ... some of the previous ones were good
 information in general, but let's take a look at Andy's application in
 particular.  
 
!) Paul calculates the variometer has 88 turns. That's too much to deal
 with if the goal is to optimise an 1750M loading coil. The idea is to use
 the vari. to fine tune to resonance, not roam the LF landscape. So, a)
 get the main bucket to resonance slightly higher that the target freq.
 Then a bit more L is added with the vari. coil.  
 
2) At all costs keep the amount of wire resistance to a Min. A) use a
 proper 2D:1L former. If needed, beef up the 5-Gal pale with Dia boosters,
 like home Ins., that pink stuff cut in strips and glued to the bucket. B)
 I reco a min of no. 14 enameled or house wire.  
 
3) Keep the inter connections to a min., and when needed use good
 connection practices, ie, soldered lugs.  
 
4) Silver coated, Teflon Ins. wire (turns can be tightly together using
 it) is available on Ebay. Price is right and won't have to buy in 500Ft
 rolls!  
--Peter  
----------------------------------  
>>> Andy - KU4XR <ku4xr at yahoo.com> 10/24/08 2:46 PM >>>  
Learning as I'm going, My variometer was the single best thing  
I have done for my beacon so far, bringing the greatest gain.  
It's a 5 gallon paint bucket, wound with very small wire. I'm  
not sure of the guage, maybe #28 to #30 ( 6 stranded solid  
burglar alarm wire ). I know small wire has higher resistance,  
So I thought it would take fewer turns for a needed inductance.  
I measure 9.0 OHMs DC resistance across the variometer, and I am  
<end>  
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