[Lowfer] [EXTERNAL]Re: LF Coil Form

Laurence KL7 L hellozerohellozero at hotmail.com
Mon Feb 10 14:27:31 EST 2014 

Thats interesting Bill - mine came from Northern China when I lived there - and I did try checking the properties by offering up a free running osc up to the material but saw very little change. I guessing the specs for the plastic and it additives change. Interesting - Ill try the local "bottles" from Wallymart and see if they have any issues - cheers
 
Laurence KL7L  Windblown
 
> Date: Mon, 10 Feb 2014 10:55:31 -0800
> From: bill.isakson at gmail.com
> To: lowfer at mailman.qth.net
> Subject: Re: [Lowfer] [EXTERNAL]Re: LF Coil Form
> 
> 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
> 
> Politics? You make the opinions -- this one-pager:
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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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