OK, request for ideas to get online with the EZnec. I can do dipoles,
verticals, place the wires for beams, etc. BUT I ahve no idea about
including loading coils, traps, or feedlines. Looking for the easiest,
quickest way to get the basics.
My thoughts are to look at a model with coils placed away from the feedppint
in a dipole. Anybody have something SIMPLE that I could look at?
Same with a trap?
Same with a capacitor?
"Standard" dipole fed with ladderline?
"Standard" dipole fed with coax?
"Standard" dipole fed with coax and a balun?
Just simple examples.
THANKS, guys.
73, de Jim KG0KP
----- Original Message -----
From: "Terry Conboy" <n6ry@arrl.net>
To: "David Gould" <dave@g3ueg.co.uk>
Cc: <antennaware@contesting.com>
Sent: Saturday, March 14, 2009 11:06 AM
Subject: Re: [Antennaware] Voltages along an antenna
> On 2009-03-04 9:36 AM, David Gould G3UEG wrote:
>> First thanks to those who helped a few weeks ago with my question
>> about the significant differences between my model and reality for my
>> 62ft vertical on 80m. The concensus was, go with what it is
>> measuring at, and ignore the difference in the model.
>>
>> Last weekend I top loaded the vertical to bring it resonant on
>> 160m, fed it through an UNUN and had a ball in the CQWW 160m SSB
>> contest, making around 40 NA QSOs across 14 states, which surprised
>> me, considering that conditions were not that good. I did not seem
>> to be loosing very much compared top my previous 108ft vertical over
>> better radials. (I must have magic soil!!!)
>>
>> EZNEC gives a table of currents along the antenna elements, is there
>> a way to find the voltages? I would like to know the voltage at the
>> top of the 62ft vertical for both 160m and 80m? I am considering
>> putting either a trap or a relay to give me dual band, so I would
>> like to know what ratings any components would need to have. (I
>> have an aversion to traps and reactance in general because of the
>> losses and the significant reduction in bandwidth as a
>> result.) can't see anything in the help, but feel it should not be
>> impossible. I may be missing something obvious...
>>
>>
> Just place a 10 megohm or larger resistor where you are planning to put
> the trap or relay. Use the Load Dat function in EZNEC to see the
> voltage across the load. You can also easily model a trap in EZNEC to
> see the dissipation in the loss resistance of the trap's inductor and
> capacitor on both bands.
>
> 73, Terry N6RY
>
>
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