[Antennaware] Re: Antennaware Digest, Vol 16, Issue 3

[Ulrich Weiss]

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 at sezampro.yu>
To: <antennaware at 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 at contesting.com>
> To: <>
> Sent: Monday, June 21, 2004 6:00 PM
> Subject: Antennaware Digest, Vol 16, Issue 3
>
>
> > Send Antennaware mailing list submissions to
> > antennaware at contesting.com
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
> > http://lists.contesting.com/mailman/listinfo/antennaware
> > or, via email, send a message with subject or body 'help' to
> > antennaware-request at contesting.com
> >
> > You can reach the person managing the list at
> > antennaware-owner at contesting.com
> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of Antennaware digest..."
> >
> >
> > Today's Topics:
> >
> >    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 at alum.mit.edu>
> > Subject: [Antennaware] Velocity factor of insulated #14 stranded  wire
> > To: antennaware at contesting.com, towertalk at contesting.com
> > Message-ID: <6.1.1.1.0.20040620185748.02f800f0 at 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 at comcast.net>
> > Subject: [Antennaware] Re: [TowerTalk] Velocity factor of insulated
> > #14 stranded wire
> > To: <antennaware at contesting.com>, <towertalk at contesting.com>, "Bill
> > Tippett" <btippett at alum.mit.edu>
> > Message-ID: <001101c45734$3d514a30$0200a8c0 at 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 at alum.mit.edu>
> > To: <antennaware at contesting.com>; <towertalk at 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
> > Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with
> any
> > questions and ask for Sherman, W2FLA.
> > >
> > > _______________________________________________
> > > TowerTalk mailing list
> > > TowerTalk at contesting.com
> > > http://lists.contesting.com/mailman/listinfo/towertalk
> >
> >
> >
> > ------------------------------
> >
> > _______________________________________________
> > Antennaware mailing list
> > Antennaware at contesting.com
> > http://lists.contesting.com/mailman/listinfo/antennaware
> >
> >
> > End of Antennaware Digest, Vol 16, Issue 3
> > ******************************************
> >
> >
>
>
> _______________________________________________
> Antennaware mailing list
> Antennaware at contesting.com
> http://lists.contesting.com/mailman/listinfo/antennaware
>