[Lowfer] [EXTERNAL]Re: LF Coil Form

William E. Isakson bill.isakson at gmail.com
Mon Feb 10 13:55:31 EST 2014 

I used one of those water bottles on 600 meters Laurence.  I suspect the
blue pigment has some magnetic properties though.  Did not seem to
interfere with the operation, but used about half the turns calculated....

--------


Bill Isakson     AC6QV  &  WD2XSH/44
Roseburg, Oregon USA
bill.isakson at gmail.com

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On Sun, Feb 9, 2014 at 6:49 PM, Howell, Laurence J <
L.Howell at conocophillips.com> wrote:

> I use those unribbed water fountain see thru water bottles/containers as
> coil formers   Nice d to l ratio...5 bucks or so. - and very strong.
>
> Laurence
>
> > On Feb 9, 2014, at 4:34 PM, "Ed Phillips" <evp at pacbell.net> wrote:
> >
> > I'm a TC guy and never had the PVC pipe problem some guys report.  Find
> > for coil forms in my experience, all the way from a 181 kHz loading coil
> > up through 30 MHz receiver coils.  I suspect Sonotube would be equally
> good.
> >
> > Ed
> >
> > Pat Bunn wrote:
> >
> >> The Tesla coil guys don't like them because the arc. The only way to
> dry them out is to strip them of the wax impregnation and then dry them and
> then use electrical varnish in multiple coats.
> >>
> >> PVC tube is lighter and easier to work with.  Some say varnished wood
> is better than PVC.
> >>
> >> Pat
> >> N4LTA
> >>
> >> Sent from my iPhone
> >>
> >> On Feb 9, 2014, at 7:54 PM, Michael Sapp <wa3tts at verizon.net> wrote:
> >>
> >>
> >>
> >>> Stan & All:  Those compressed cardboard "sonotubes" are popular for
> telescope building. Might be some useful
> >>> info in the home scope builder domain for resin coating them....
> that's all nasty chemicals tho, for $100 or so it's worth finding a tube
> section ready to go.... Mike wa3tts
> >>>
> >>>
> >>> ----- Original Message ----- From: "stan, W1LE" <stanw1le at verizon.net>
> >>> To: "Discussion of the Lowfer (US, European, &amp; UK) and MedFer
> bands" <lowfer at mailman.qth.net>
> >>> Sent: Sunday, February 09, 2014 6:26 PM
> >>> Subject: Re: [Lowfer] LF Coil Form
> >>>
> >>>
> >>>
> >>>
> >>>> The round concrete form for footings is a good alternative from Home
> Depot.
> >>>> Mine is 12.5" OD with 1/8" wall.   Buy the length you need in 4'
> increments.
> >>>>
> >>>> It looks like compressed fiberboard, but I know that it disintegrates
> out in the weather,
> >>>> but it matters not, because by then the concrete is hard.
> >>>>
> >>>> My thought is to wind the coil, then give it a coat or fiberglass
> resin for a little waterproofing.
> >>>>
> >>>> Other possibilities are a 55 gallon white plastic drum with straight
> sides or the 190 liter pickle barrels.
> >>>> I would avoid any colored barrels, like black, because of the
> pigmentation may effect electrical performance, maybe.
> >>>> These UN rated plastic barrels are very durable and have lasted for
> years in their outside storage role.
> >>>>
> >>>> I got my 55 gallon barrels for yard waste from a used barrel dealer.
> >>>>
> >>>> Stan, W1LE     Cape Cod
> >>>>
> >>>>
> >>>>
> >>>> On 09-Feb-14 4:08 PM, Peter Barick wrote:
> >>>>
> >>>>
> >>>>> OUCH, Old boy! Only $100?? ;~)
> >>>>> Locally I've picked up scrap green sewer pipe from street work
> around town (only after hours). Always have remnants of those jobs. Last
> one was about 5 ft by 18 inches. Also found a 3 foot D pvc drum (no metal
> rings) that a business discarded full of trash. I emptied it for them. And
> I have a smaller 18 inch white pvc
> >>>>> bucket w/ straight sides, another discard.
> >>>>> Has anyone noticed the cement formers sold in home inprove stores?
> They are hardened fiber and I believe up to 2 feet in D. And scant few
> bucks!
> >>>>> Cheers, Peter, Illinois
> >>>>> ---------------------------------------
> >>>>>
> >>>>>
> >>>>>>>> pbunn <pbunn at matrixei.com> 02/07/14 8:28 AM >>>
> >>>>> Just a FYI
> >>>>>
> >>>>> I have been searching for quite a while for a reasonably priced coil
> form for 137 and 75 KHz. It ended up being right under my nose.
> >>>>>
> >>>>> Harrison Superduct - Plastic duct is available in many sizes up to
> 60" diameter. I just bought a 36" long 16 " OD section for just over 100
> bucks. That may sound expensive but compared to Schedule 40 or 80 pipe it
> is cheap. It is made of PVC and is thin wall duct. They take credit cards
> and will ship UPS but the plant is about 30 miles from here in Clover, SC
> and I can pick it up.
> >>>>>
> >>>>> Pat
> >>>>> WG2XLP
> >>>>> WG2XCT
> >>>>> N4LTA
> >>>>>
> >>>>>
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