[Boatanchors] Coils and the winding thereof

[Carl]

I dont think Id use that material for any transmitting due to dielectric 
losses.

The pill bottles from the pharamacy work well at RF without Q degradation. 
They come in several size up to 2" diameter and are often free for the 
asking. They should handle at least 10W as long as copper losses are 
minimum.

I havent made any Q measurements on regular pill bottles, soda. or any 
others. Ceramic forms are readily available for large diameters.

White PVC pipe has been reported decent for traps but Ive not used any for 
many decades.

And of course fiberglass tubing is also excellent.

Carl
KM1H



----- Original Message ----- 
From: "Michael Tauson" <wh7hg.hi at gmail.com>
To: "arc5" <arc5 at mailman.qth.net>; "boatanchors" 
<boatanchors at mailman.qth.net>; "milsurplus" <milsurplus at mailman.qth.net>
Sent: Tuesday, June 30, 2009 5:42 PM
Subject: [Boatanchors] Coils and the winding thereof


> Back before time when I was making receivers from 1930s Gernsback
> publications, one of the things I did was to make coil forms by
> finding something a decent amount under the final coil form diameter
> (which was mostly guesswork), wrap it in waxed paper then wrap lengths
> of newsprint that had been precut to the width I needed around it.
> The layers were "glued" to the previous ones using spar varnish (of
> which I had plenty) then, when the varnish was tacky, I'd wind the
> coil so it would be held in place when the varnish completely dried.
>
> This worked fine for TRF & regen receivers and I'm wondering if
> there's any reason it wouldn't work for the transmitter[s] I have
> planned.  The maximum power out I want will be around 25 watts with a
> more desirable output being 10 watts with the attendent reduced
> voltages & currents so that shouldn't be an issue, and I can't think
> of anything else that might become an irritation but I am sure I'm
> overlooking something important.  And thoughts or ideas?
>
> BEst regards,
>
> Michael, [wh]7HG  :-)
> -- 
> http://www.nationalmssociety.org/chapters/NTH/index.aspx
> http://wh7hg.blogspot.com/
> http://kludges-other-blog.blogspot.com
> Hiki Nô!
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