[TowerTalk] End Fed Wire

[ersmar@comcast.net]

Bob:

     Another way of saying this is your model needs another wire between the shack end of your LW and ground.  Then you put a source in this wire.  Make the vertical wire 6.1M long and put the source at the 10% point from ground in that wire.  The impedance that the model shows for this feedpoint is the impedance your tuner must match.

     But Jim is correct - you need a connection to ground/earth for the model to work.  

73 de
Gene Smar  AD3F


-------------- Original message -------------- 
From: Jim Lux <jimlux at earthlink.net> 

> At 10:05 PM 12/10/2005, AD5VJ Bob wrote: 
> >I am trying to do an approximation. 
> > 
> >I am using NEC and am trying to look at my end feed wire 
> >but can not find an end feed wire in the models. 
> > 
> >Does anyone know which model I can use that would be best 
> >suited for an end feed horizontal wire with no feed line. 
> > 
> >It is not a dipole. 
> > 
> >It is just a horizontal wire (109.7 meters long up at 6.1 
> >meters) that comes straight to my tuner which has 
> >capability of tuning a single random wire antenna. 
> 
> SO where's the ground wire from your tuner connected? to the earth? Put 
> wires in your model to represent the wire from the tuner to ground (it will 
> need to "touch" the ground in your model, i.e. z=0). Put the feedpoint 
> where the tuner is. 
> 
> 
> 
> 
> 
> > 73 fer nw, 
> >Bob AD5VJ 
> > 
> >10X# 37210, FP#-1141, SMIRK#-5177 
> >http://www.n5iet.com/ 
> >Code may be taking a back seat for now, 
> >but the pioneering spirit that put the code 
> >there in the first place is out front of it all. 
> > 
> > 
> > 
> > 
> >_______________________________________________ 
> > 
> >See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless 
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> >any questions and ask for Sherman, W2FLA. 
> > 
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> _______________________________________________ 
> 
> 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. 
> 
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