hello Andreja,
from your message to Bill, W4ZV, I can see that you have been experimenting
with the resonant frequencies of insulated vs. bare wires...
do I understand you correctly that - when using 2,5mm sq. copper wire with
PVC insulation - you have to input 3,85 MHz if you want to get proper
results at 3,725 MHz??? that means your correction factor for that type of
insulated wire is 3,3%...
this value coincides very well with the empiric values that I have found in
a series of experiments with dipoles and loops last summer...
meanwhile EZNEC 4.0 offers an option for insulated wires taking the
insulating material and its thickness into account... unfortunately the
results of this new option do not coincide with our values yielding a
correction of only abt 1,5% for a 2,5 mm sq. wire with PVC-insulation of 0,5
mm...
I plan to provide W7EL with my experimental data and hope that many more
hams world-wide will do the same to enable Roy to improve his
calculations...
greetings from Germany
Uli, DJ2YA
----- Original Message -----
From: "Andreja Todorovic" <muzikant@sezampro.yu>
To: <antennaware@contesting.com>
Sent: Tuesday, June 22, 2004 1:02 AM
Subject: [Antennaware] Re: Antennaware Digest, Vol 16, Issue 3
> For Eznec simulation put freq's. like that:
> 3.725 Mhz in real is 3.85; 7.050 real is 7.24; 14.150 is 14.7;
21.200=21.8;
> 28.5=29.250; 50.150=50.6 etc, for 2,5mm sq. copper wire in PVC
>
> ----- Original Message -----
> From: <antennaware-request@contesting.com>
> To: <>
> Sent: Monday, June 21, 2004 6:00 PM
> Subject: Antennaware Digest, Vol 16, Issue 3
>
>
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> > Today's Topics:
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> > 1. Velocity factor of insulated #14 stranded wire (Bill Tippett)
> > 2. Re: [TowerTalk] Velocity factor of insulated #14 stranded
> > wire (Gene Smar)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Sun, 20 Jun 2004 19:00:30 -0400
> > From: Bill Tippett <btippett@alum.mit.edu>
> > Subject: [Antennaware] Velocity factor of insulated #14 stranded wire
> > To: antennaware@contesting.com, towertalk@contesting.com
> > Message-ID: <6.1.1.1.0.20040620185748.02f800f0@pop.vnet.net>
> > Content-Type: text/plain; charset="us-ascii"; format=flowed
> >
> > I know the new version of Eznec 4.0 handles this
> > but does anyone know the correction factor for insulated
> > #14 stranded wire (a la Home Depot). My guess is that
> > it is about 95% but does anyone know for sure?
> >
> > 73, Bill W4ZV
> >
> >
> >
> > ------------------------------
> >
> > Message: 2
> > Date: Sun, 20 Jun 2004 22:05:34 -0400
> > From: "Gene Smar" <ersmar@comcast.net>
> > Subject: [Antennaware] Re: [TowerTalk] Velocity factor of insulated
> > #14 stranded wire
> > To: <antennaware@contesting.com>, <towertalk@contesting.com>, "Bill
> > Tippett" <btippett@alum.mit.edu>
> > Message-ID: <001101c45734$3d514a30$0200a8c0@D4HXWL31>
> > Content-Type: text/plain; charset="iso-8859-1"
> >
> > Bill:
> >
> > I recall a figure more like 97% (3% shortening) for insulated wire.
> I
> > got this figure some time ago here on TT.
> >
> > 73 de
> > Gene Smar AD3F
> >
> > ----- Original Message -----
> > From: "Bill Tippett" <btippett@alum.mit.edu>
> > To: <antennaware@contesting.com>; <towertalk@contesting.com>
> > Sent: Sunday, June 20, 2004 7:00 PM
> > Subject: [TowerTalk] Velocity factor of insulated #14 stranded wire
> >
> >
> > > I know the new version of Eznec 4.0 handles this
> > > but does anyone know the correction factor for insulated
> > > #14 stranded wire (a la Home Depot). My guess is that
> > > it is about 95% but does anyone know for sure?
> > >
> > > 73, Bill W4ZV
> > >
> > > _______________________________________________
> > >
> > > See: http://www.mscomputer.com for "Self Supporting Towers",
"Wireless
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> any
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> > >
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> >
> >
> >
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> > End of Antennaware Digest, Vol 16, Issue 3
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