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With EZNEC the various wires have to attach to a single segment that
contains the source. As I understand it, the NEC engine can't handle
multiple wires attached to the source, hence the single, centre
segment. <br>
<br>
I haven't looked at fan dipoles in EZNEC yet, I'm too busy trying
sort out the Wells' Quadrant* for 30m.<br>
<br>
* Wells' Quadrant comprises two half-wave elements at right angles
to each other at the feed point. The resulting radiation pattern is
essentially omni-directional horizontal polarisation, within about
1.5dB, according to EZNEC.<br>
<br>
Ray vk2tv<br>
<br>
On 12/12/10 07:53, Damien Gardner Jnr wrote:
<blockquote
cite="mid:453C3B6C-1D41-4864-B488-68B1B43E7CE5@rendrag.net"
type="cite">I'm thinking I got too technical.. either fan dipoles
are completely flawed, or antenna modelling just doesn't work on
them.. I finally finished putting the 20+10 dipoles in (lordy I
re-learnt a lot of trig last night!), and it looks absolutely
horrid for SWR.. yet everything I can find on the 'net suggests
1.5:1 on each band.. I might just build it and see ;)
<div><br>
</div>
<div>--DG</div>
<div><br>
<div>
<div>On 12/12/2010, at 6:30 AM, Ray Wells wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">
<div bgcolor="#ffffff" text="#000000"> Gee, I didn't get
that technical <grin><br>
<br>
Ray vk2tv<br>
<br>
On 11/12/10 23:51, Damien Gardner Jnr wrote:
<blockquote cite="mid:4D0373CD.6050304@rendrag.net"
type="cite"> Ewwww, ray was correct - swr on 30m would
be 38 (609+j895) on 30m, due to the other band dipoles
not being full wave etc on 30m.. Ok, will be a
40(+15)/20/10 dipole then ;) I had contemplated shoving
5m on the bottom, but it might look kinda rediculous in
the middle..<br>
<br>
--DG<br>
<br>
On 11/12/2010 11:35 AM, Damien Gardner Jnr wrote:
<blockquote
cite="mid:9DE3B878-DA62-4BB8-B4A6-A25783C81359@rendrag.net"
type="cite">ooh, really? I'm building one based from
here (<a moz-do-not-send="true"
href="http://www.hamuniverse.com/multidipole.html">http://www.hamuniverse.com/multidipole.html</a>)
- yard isn't big enough for 40m of dipole for 80m
band, so having already built the centre (<a
moz-do-not-send="true"
href="http://www.rendrag.net/wpg2?g2_itemId=11755">http://www.rendrag.net/wpg2?g2_itemId=11755</a>),
I thought I'd just make the top band 40m, and add 30
in the middle.. Might shove it through MMANA first to
see what happens, before I finish cutting and
assembling that behemoth, and then pulling it up
between the masts..
<div><br>
</div>
<div>Thanks,</div>
<div><br>
</div>
<div>DG</div>
<div><br>
<div>
<div>On 11/12/2010, at 11:26 AM, Ray Wells wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">
<div bgcolor="#ffffff" text="#000000"> Previous
experience of adding a 30m dipole to an
existing 20/40/80m unit was not good. 30m
doesn't have a harmonic relationship and it
presented weird and wonderful reactance to the
feedpoint. ymmv<br>
<br>
Ray vk2tv<br>
<br>
On 11/12/10 11:19, Damien Gardner Jnr wrote:
<blockquote
cite="mid:222B32E4-B2EF-43CE-906C-8D521B0FF3CD@rendrag.net"
type="cite">Lol, though monitors aren't
allowed in bins, or even hard waste roadside
pickup :(
<div><br>
</div>
<div>I have to say I do like the dell
service, where if you order a computer
with a monitor (can just be a laptop),
they pickup the old monitor for free and
dispose of it :) Though they had a heart
attack when we asked if we could dispose
of 60 21" sony's through that :-p
Actually, they had enough of a heart
attack when we asked about ordering 60
LCD's as 'spares' for our existing
machines.. ;)</div>
<div><br>
</div>
<div>-_DG</div>
<div><br>
</div>
<div>Off to build a 40/30/20/10m fan dipole
this arvo after work, will be interesting
to see how much better that is than my
TEV-1 vertical!</div>
<div><br>
</div>
<div><br>
<div>
<div>On 11/12/2010, at 10:54 AM, Ray
Wells wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">
<div bgcolor="#ffffff" text="#000000">
If I had a garbage service I'd toss
the monitor in the bottom of the
wheelie bin and it would just
disappear but, no garbage service
means a visit to the tip. I wonder
how many monitors my big dam will
hold <g><br>
<br>
<br>
Ray vk2tv<br>
<br>
On 11/12/10 10:43, Damien Gardner
Jnr wrote:
<blockquote
cite="mid:DCB85970-08EA-4085-A580-E44A6FCD552B@rendrag.net"
type="cite">
<div>
<div>On 11/12/2010, at 10:38 AM,
Ray Wells wrote:</div>
<br
class="Apple-interchange-newline">
<blockquote type="cite">
<div bgcolor="#ffffff"
text="#000000">You mentioned
monitors. I recently took
two dead CRT monitors to the
tip (I don't have a garbage
service) and was informed
there is a (NSW) government
enforced $5.00 fee per
monitor to leave them at the
tip. How's that for a hidden
tax? I wonder how many dead
monitors will now be given
swimming lessons?<font
class="Apple-style-span"><font
class="Apple-style-span"
color="#144fae"><br>
</font></font></div>
</blockquote>
<br>
</div>
<div>Wow, that's not bad - ACT
govt charges $50/monitor to dump
them at the tip.. - when we
replaced our 21" sony CRT's with
19" LCD's back in 2005 (worked
out we'd pay back the costs of
replacing 3x21" 500W crt's with
3x19" 50W LCD's per Desk, in
just under 6 months!), we ended
up shoving them all into the
dumpster out the back over a
couple of weeks..</div>
<div><br>
</div>
<div>--DG</div>
<div><br>
</div>
<div><br>
</div>
<div><span
class="Apple-style-span"
style="font-size: 12px;">Damien
Gardner Jnr</span><span
class="Apple-style-span"
style="font-size: 12px;"><br>
</span><span
class="Apple-style-span"
style="font-size: 12px;">VK2TDG.
Dip EE. GradIEAust</span><span
class="Apple-style-span"
style="font-size: 12px;"><br>
</span><span
class="Apple-style-span"
style="font-size: 12px;"><a
moz-do-not-send="true"
href="mailto:rendrag@rendrag.net">rendrag@rendrag.net</a>
- </span><span
class="Apple-style-span"
style="font-size: 12px;"><a
moz-do-not-send="true"
href="http://www.rendrag.net/">http://www.rendrag.net/</a></span><span
class="Apple-style-span"
style="font-size: 12px;"><br>
</span><span
class="Apple-style-span"
style="font-size: 12px;">--</span><span
class="Apple-style-span"
style="font-size: 12px;"><br>
</span><span
class="Apple-style-span"
style="font-size: 12px;">We
rode on the winds of the
rising storm,</span><span
class="Apple-style-span"
style="font-size: 12px;"><br>
</span><span
class="Apple-style-span"
style="font-size: 12px;"> We
ran to the sounds of thunder.</span><span
class="Apple-style-span"
style="font-size: 12px;"><br>
</span><span
class="Apple-style-span"
style="font-size: 12px;">We
danced among the lightning
bolts,</span><span
class="Apple-style-span"
style="font-size: 12px;"><br>
</span><span
class="Apple-style-span"
style="font-size: 12px;"> and
tore the world asunder</span></div>
<br>
<pre wrap=""><fieldset class="mimeAttachmentHeader"></fieldset>
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<br>
<br>
<pre class="moz-signature" cols="72">--
Damien Gardner Jnr
VK2TDG. Dip EE. GradIEAust
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:rendrag@rendrag.net">rendrag@rendrag.net</a> - <a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://www.rendrag.net/">http://www.rendrag.net/</a>
--
We rode on the winds of the rising storm,
We ran to the sounds of thunder.
We danced among the lightning bolts,
and tore the world asunder
</pre>
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</blockquote>
<br>
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