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To elevate it, use the force. 🙂<br>
<br>
73<br>
John Denison<br>
KD5YOU<br>
<br>
<div class="moz-cite-prefix">On 6/19/2024 8:24 PM, Andre Pollard via
BVARC wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CACQ7-NyF0u--_nHnK_neQhReFjVEnKOfKj8xLBYY22G4i72DeQ@mail.gmail.com">
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<div dir="ltr">Thanks all for the feedback. No chance to work on
it today, even if the weather had cooperated.Â
<div><br>
</div>
<div>Â I can get it to work fine on 20M and up, and since the
trip starts soon, I'm going to try it again when we get back.
Going to try another testing location to rule out interference
that only seems to affect 40M, since the current location is
fairly near the house (stucco with metal lath), and buried
electric lines. Also will try different coil settings and
grounds. I will try to elevate it too, but since this is my
hiking antenna I'm not sure I want to add a tripod LOL.
<div><br>
</div>
<div>Andre </div>
<div>W4SFZ</div>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, Jun 19, 2024 at
4:09 PM John Denison via BVARC <<a
href="mailto:bvarc@bvarc.org" moz-do-not-send="true"
class="moz-txt-link-freetext">bvarc@bvarc.org</a>> wrote:<br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div> Hi Andre<br>
<br>
I was going to mention the 33' counterpoises, but I see that
you have done that already. I've used a single counterpoise
on 40 meters with various coil antennas. One thing I didn't
see in any of the emails is... where are you setting up your
antenna? Is there anything metallic nearby?<br>
<br>
I have a Wolf River Coils Take It Along mini which is good
for 40 meters and up, and I found that I can tweak the
resonant frequency by rotating the sleeve around the coil
rather than just moving it up and down. I use either the
stock WRC telescopic whip or a Buddipole extended length
whip used for 80 meters. Both are roughly 10 feet long.<br>
<br>
I typically achieve better results with vertical antennas
when they are elevated above the ground. i.e. 4-5 feet vs .5
foot above the ground, though I was never able to get any
results comparable to an inverted V. With a manual tuner I
was able to make the transceiver happy while still being
able to use the antenna to some degree of success, but it
took a steady hand and very miniscule changes in the
capacitance knobs.<br>
<br>
73<br>
John Denison<br>
KD5YOU<br>
<br>
<div>On 6/18/2024 4:19 PM, Andre Pollard via BVARC wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">I need one of our antenna gurus to give me
some input-
<div><br>
</div>
<div>I have an 18'-4" telescoping antenna I have been
using when camping. By adjusting length, I can get it
to tune at <1.5 SWR on all bands 20M and above. So
far so good, but when do we ever leave well enough
alone.</div>
<div><br>
</div>
<div>I'm getting ready to travel for a while, and wanted
to extend the range down to 40M. So I used the
calculators at <a
href="https://www.66pacific.com/calculators/coil-shortened-vertical-antenna-calculator.aspx"
target="_blank" moz-do-not-send="true">Coil-Shortened
Vertical Antenna Calculator (66pacific.com)</a>Â to
determine the necessary coil. It said I need 4.9 mH. I
made the coil per the calcs one the same site, using a
1.9 inch diameter PVC pipe. I'm running it
bottom-loaded.</div>
<div><br>
</div>
<div>By tapping the coil a couple of turns down, I can
get it to tune to 7.2 mhz, but the SWR is >6. If I
put my hand very close to the coil , the frequency
shifts (expected), and the SWR drops to 1.2. So I
tried adjusting the length and tapping
different turns, never better than 4 SWR on any
frequency around 7 mhz. However, if I get my hand near
the coil, SWR drops. </div>
<div><br>
</div>
<div>Thinking this meant I needed capacitance, IÂ tried a
hat to the whip, with several different designs and
sizes. Changes frequency, but horrible SWR still. </div>
<div><br>
</div>
<div>Bypassing the coil I can adjust the whip and get
great SWR on 14 mhz and above. So, I don't think it's
a problem with the coax (20 feet of RG8X) or nanoVNA.</div>
<div><br>
</div>
<div>Google shows up all sorts of sites showing making a
coil loaded shortened vertical like i'm trying. None
mention the issue I'm seeing as a problem. </div>
<div><br>
</div>
<div>I'd appreciate any input, I've been 'learning' on
this for a couple of days now and haven't gotten it to
work yet.</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Andre</div>
<div>W4SFZ</div>
</div>
<br>
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