Coil Construction, was: [AMRadio] Fun with 4D32's...


Brett gazdzinski brett.gazdzinski at verizonbusiness.com
Thu Jan 4 11:18:23 EST 2007


Larry,
Where do you get the strips of plastic to drill
and pass the coil through?

Brett
N2DTS 

> -----Original Message-----
> From: amradio-bounces at mailman.qth.net 
> [mailto:amradio-bounces at mailman.qth.net] On Behalf Of Larry Keith
> Sent: Tuesday, January 02, 2007 1:19 PM
> To: 'Discussion of AM Radio in the Amateur Service'
> Subject: RE: Coil Construction, was: [AMRadio] Fun with 4D32's...
> 
> 
> 
> 
> 
> Thanks Larry.
> How do you keep the spacing of the holes
> exact?
> 
> I have a "homebrew" table that attaches to my small drill 
> press.  The table
> has a fence and a stop.  I use spacers (plywood 
> strips)stacked against the
> stop.  I drill a hole and remove a spacer, reposition the 
> work, drill a
> hole, etc..
> 
> 
> Since the handbook says the antenna tuner is good
> for 250 watts of AM, I would need to at least double
> the size of things, from the #14 at 8 tpi, about
> a foot or more long, to ?
> #10, or #8, or thin copper tubing?
> 
> I have built coils using #12, #10, #8 and using copper 
> tubing, using the
> same construction methods.
> 
> 
> 
> 
> Balance is important, maybe hard to do with
> a home brew coil..
> 
> Why?
> 
> 
> 
> I did not study the text, not sure if its supposed to
> cover 160 meters, but if I built one, might
> as well include 160...
> 
> You just doubled the coil size, if it wasn't designed for 160...
> 
> 
> 
> I know I will need to make some sort of coil 
> form/support to achieve a good balance.
> 
> Polycarbonate sheet.. Mounted on stand-off insulators..
> 
> 
> 73,
> 
> Larry
> KQ4BY
> 
> 
> 
> 
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