<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Ah, so the cap is in series with the antenna wire at the 1/3 point (from the driven end).<div class=""><br class=""></div><div class="">Makes more sense, thanks!</div><div class=""><br class=""></div><div class="">73, Willie N1JBJ</div><div class=""><div class=""><div><br class=""></div></div><div><blockquote type="cite" class=""><div class="">On Sep 26, 2022, at 12:04 PM, Tim KC1RET <<a href="mailto:kc1ret.radio@gmail.com" class="">kc1ret.radio@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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<div class="">
<font face="Verdana" class="">I used this load cap in the wire element:
<a class="moz-txt-link-freetext" href="https://batteryeliminatorstore.com/products/40m-end-fed-insulator-kit">https://batteryeliminatorstore.com/products/40m-end-fed-insulator-kit</a><br class="">
<br class="">
The dimensions for the 80m EFHW, including the coax counterpoise,
are also shown on that page.<br class="">
<br class="">
The cap I am missing is within the 36:1 xformer; across the
primary (coax feed) winding.<br class="">
<br class="">
Clearer?<br class="">
<br class="">
73,<br class="">
<br class="">
Tim - KC1RET<br class="">
</font><br class="">
<div class="moz-cite-prefix">On 9/26/2022 12:00, William Smith
wrote:<br class="">
</div>
<blockquote type="cite" cite="mid:A2460DB8-5F85-41BB-9E45-F5460CFE2B53@compusmiths.com" class="">
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Now I'm confused (which is not unusual):
<div class=""><br class="">
</div>
<div class="">You've spoken of a matching transformer/balun, and a
choke, and a cap at the midpoint of an end-fed antenna, but my
brain just isn't working right.</div>
<div class=""><br class="">
</div>
<div class="">Which parts from (I assume) <a href="https://batteryeliminatorstore.com/collections/ocf-masters" class="moz-txt-link-freetext" moz-do-not-send="true">https://batteryeliminatorstore.com/collections/ocf-masters</a>
did you assemble?</div>
<div class=""><br class="">
</div>
<div class="">73, Willie N1JBJ</div>
<div class="">
<div class="">
<div class=""><br class="">
</div>
</div>
<div class="">
<blockquote type="cite" class="">
<div class="">On Sep 26, 2022, at 11:52 AM, Tim KC1RET <<a href="mailto:kc1ret.radio@gmail.com" class="moz-txt-link-freetext" moz-do-not-send="true">kc1ret.radio@gmail.com</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
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charset=UTF-8" class="">
<div class=""> <font class="" face="Verdana">I have the
cap in the midpoint of the 'driven' wire. My
understanding (albeit quite tenuous) is that the cap
across the primary improves the performance on the
higher bands.<br class="">
<br class="">
Frankly, if the cap doesn't help I may pull this down
and opt for the 40m version as a test.<br class="">
<br class="">
73,<br class="">
<br class="">
Tim - KC1RET<br class="">
</font><br class="">
<div class="moz-cite-prefix">On 9/26/2022 11:10, William
Smith wrote:<br class="">
</div>
<blockquote type="cite" cite="mid:9D853E6B-FE8B-475C-B1F5-5B5DF68A2115@compusmiths.com" class="">
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charset=UTF-8" class="">
I’m surprised it works at all without the cap, let us
know how it does with the cap!
<div class=""><br class="">
</div>
<div class="">73, Willie N1JBJ</div>
<div class=""><br class="">
<div dir="ltr" class="">
<blockquote type="cite" class="">On Sep 26, 2022,
at 10:45 AM, Tim KC1RET <a class="moz-txt-link-rfc2396E" href="mailto:kc1ret.radio@gmail.com" moz-do-not-send="true"><kc1ret.radio@gmail.com></a>
wrote:<br class="">
<br class="">
</blockquote>
</div>
<blockquote type="cite" class="">
<div dir="ltr" class="">
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<font class="" face="Verdana">MANY thanks to all
who replied privately to my original plea!<br class="">
<br class="">
I go the thing (80m EFHW) up this weekend
following the design on the OCFMasters
website. Well... partial success. Granted,
I'm still waiting for the cap that goes across
the primary at the 39:1 matching xformer/balun
and that it is still very low, only about 8ft
above the ground at the lowest point.<br class="">
<br class="">
The SWR at a useful point in the band
(measured at the choke) is OK on 80, 40 and
10, but really quite bad everywhere else.<br class="">
<br class="">
The missing cap is due from Digikey today.
Stay tuned... (pun intended)<br class="">
<br class="">
73, Tim - KC1RET<br class="">
</font><br class="">
<div class="moz-cite-prefix">On 9/22/2022 23:59,
Jim Idelson wrote:<br class="">
</div>
<blockquote type="cite" cite="mid:CANvg0V5pWO0D3+wF7-Mz_eO6YPyXCCmTOgws+dYmo4_Xa-R79g@mail.gmail.com" class="">
<meta http-equiv="content-type" content="text/html; charset=UTF-8" class="">
<div dir="auto" class="">The 'effective
electrical length' of the wire is influenced
by several parameters. One of them is the
physical length. Others include the type of
wire, the insulation and the height above
ground. Hard to know what that little loop
from the main wire to the balun will do. You
don't actually know that electrical length
for sure until you measure it with a signal
applied from your antenna analyzer or
transmitter.
<div dir="auto" class=""><br class="">
</div>
<div dir="auto" class="">So, here's the Pro
Tip: <b class="">Always make the initial
cut on the long side - a good foot to
eighteen inches.</b> It's a whole lot
easier to trim bits off than it is to add
length of you cut it too short.<br class="">
<br class="">
<div data-smartmail="gmail_signature" dir="auto" class="">73 Jim K1IR</div>
</div>
</div>
<br class="">
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Thu,
Sep 22, 2022, 8:59 AM Tim KC1RET <<a href="mailto:kc1ret.radio@gmail.com" moz-do-not-send="true" class="moz-txt-link-freetext">kc1ret.radio@gmail.com</a>>
wrote:<br class="">
</div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px
#ccc solid;padding-left:1ex">
<div class=""> <font class="" face="Verdana">OK, time for newbie
question...<br class="">
<br class="">
When measuring the length of a wire
antenna element, such as an EFHW, do
you include or ignore the bit from the
end insulator to the terminal of the
balun?<br class="">
<br class="">
Yes, I know, it will only amount to
4-6 inches but I'd rather get it right
from the start than have to add/trim
later.<br class="">
<br class="">
Thanks!<br class="">
<br class="">
Tim - KC1RET</font></div></blockquote></div></blockquote></div></blockquote></div></blockquote></div></div></blockquote></div></div></blockquote></div></div></blockquote><br class=""></div><br class=""></div></body></html>