mirror of
https://github.com/antenna2/cebik.git
synced 2026-10-16 17:54:10 +02:00
Compare commits
4
Commits
dc055f70c8
...
main
| Author | SHA1 | Date | |
|---|---|---|---|
|
|
c4efe8435d | ||
|
|
d87a1eab6d | ||
|
|
32d26d98de | ||
|
|
26a02a2755 |
@@ -1,6 +1,6 @@
|
||||
# Cebik W4RNL (SK) Website and Document Collection
|
||||
|
||||
This is the version hosted at [www.antenna2.net/cebik](https://www.antenna2.net/cebik/)
|
||||
This is the version hosted at [antenna2.github.io/cebik](https://antenna2.github.io/cebik/)
|
||||
|
||||
The version of Cebik's site hosted here is derived from what Marcel had hosted at on5au.be while online. A copy can be viewed in the internet archive at [https://web.archive.org/web/20240526234616/http://on5au.be/Cebik%20documents.html](https://web.archive.org/web/20240526234616/http://on5au.be/Cebik%20documents.html).
|
||||
|
||||
@@ -62,10 +62,6 @@ The file structure was tidied, images relocated from content/ root, PVC page and
|
||||
- Add linked navigation footer and index pages based on directory structure.
|
||||
- Improve viewing on mobile devices.
|
||||
|
||||
## Visitor Statistics
|
||||
|
||||
[https://github.com/lonney9/Go-Access](https://github.com/lonney9/Go-Access).
|
||||
|
||||
## Serve over Local Network
|
||||
|
||||
With Python installed run the following from with-in the top level, and it will serve it over http.
|
||||
@@ -77,14 +73,16 @@ cd cebik
|
||||
python3 -m http.server 8000
|
||||
```
|
||||
|
||||
## Nested Repos www-live and cebik
|
||||
## Nested Repos [antenna2.github.io](https://github.com/antenna2/antenna2.github.io) repo and cebik
|
||||
|
||||
I decided to use nested repos at this time with .gitignore configured to ignore the nested or sub repo(s) with-in.
|
||||
|
||||
This seemed to be the simplest way to do it with out more complex git commands I found in other examples.
|
||||
|
||||
To replicate the same setup I use, clone www-live first, then cd into www-live and clone cebik.
|
||||
To replicate the same setup I use, clone web root first, then cd into it and clone/move cebik repo.
|
||||
|
||||
This is only useful to test the entire site locally if needed.
|
||||
|
||||
.gitignore in www-live handles ignoring the nested cebik repo.
|
||||
It also holds the favicon and apple-touch icons, robots.txt, sitemap.xml, and the script to generate the sitemap.
|
||||
|
||||
.gitignore handles ignoring the nested cebik repo.
|
||||
|
||||
@@ -182,7 +182,7 @@ meters MHz R+/-jX SWR R+/-jX SWR
|
||||
<p>In place of such baluns to suppress common-mode currents, Varney recommends a 6" diameter coil of about 8 to 10 turns of the feedline coaxial cable at the junction of the matching section and the main feedline. I have found that W2DU-type ferrite bead chokes also perform well in this function.</p>
|
||||
<p>One recommendation that I have seen from vendors of commercially prepared G5RV kits is to use as long a run of coaxial cable as possible. Coaxial cable is inherently lossier than parallel transmission line. Any SWR factor acts as a multiplier on the basic matched-line loss of a cable at a given frequency. Hence, the only reason that I can think of for using a very long run of coaxial cable--other than one of necessity for extending from the shack to the antenna--is to use the line losses to mask the SWR at the shack end of the line. If the measured SWR at the shack end of the line is very significantly lower than the sorts of figures produced by these models--or models customized to the system proposed by a user--then they result from line losses. And the only purpose for accepting such losses would be to operate the system without a tuner.</p>
|
||||
<p>With a wide-range tuner, one achieves the lowest feasible loss level with the shortest possible coaxial cable run.</p>
|
||||
<p>For a good analysis of the losses associated with various ways of employing combinations of parallel line, coaxial cables, and tuners with the basic G5RV wire, see the extensive notes of Owen Duffy, VK1OD, at <a href="https://owenduffy.net/antenna/G5RV/" target="_blank">owenduffy.net/antenna/G5RV/</a>.</p>
|
||||
<p>For a good analysis of the losses associated with various ways of employing combinations of parallel line, coaxial cables, and tuners with the basic G5RV wire, see the extensive notes of Owen Duffy, VK1OD, at <a href="https://web.archive.org/web/20240318044108/https://owenduffy.net/antenna/G5RV/" target="_blank">owenduffy.net/antenna/G5RV/</a>(web.archive.org).</p>
|
||||
<h4>Conclusion to Part 2</h4>From Louis Varney's own writings, we can derive and confirm with NEC-4 models the fact that the G5RV antenna system is suitable for multi-band operation, just as any wire from about 88 to 140 feet might be. The matching system comes into play, not to do away with the need for an ATU, but to permit the use of a coaxial cable as the main feedline with SWR values that are considerably lower than they would be without the matching section on most HF bands. Nevertheless, the ATU remains an essential part of the G5RV antenna system.
|
||||
<p>The use of coaxial cable for the main feedline has some advantages in the modern home. Contemporary homes have walls, ceilings, and floors that are rampant with wiring and other metallic conductors associated with heating and air conditioning systems. Hence, indoors, the chances of a parallel line encountering environments that would disrupt the line balance have multiplied with time. A coaxial cable main feedline properly immunized from common-mode currents with a suitable choke offers some isolation from the conductive contents of the modern home with only small losses as the cost.</p>
|
||||
<p>50-Ohm cable has come to rule the field of amateur feedlines. As well, the ATU remains among many folks a suspect device, since it adds to the number of boxes on the operating desk. As a result, after the appearance of the G5RV antenna system, a search ensued for a combination of antenna wire length and matching section that would yield the highest number of amateur bands offering ATU-less operation on a 50-Ohm cable. We shall devote a final part to this series to explore a G5RV variant, perhaps the most successful effort to reach the 50-Ohm cable goal.</p>
|
||||
|
||||
+7
-4
@@ -30,7 +30,7 @@
|
||||
<ul style="list-style-type: none;">
|
||||
<li>
|
||||
<form method="get" action="https://duckduckgo.com/" target="_blank">
|
||||
<input type="hidden" name="sites" value="www.antenna2.net"/>
|
||||
<input type="hidden" name="sites" value="antenna2.github.io"/>
|
||||
<input type="text" name="q"/>
|
||||
<button type="submit">Search</button>
|
||||
</form>
|
||||
@@ -38,7 +38,10 @@
|
||||
</ul>
|
||||
<ul>
|
||||
<li>
|
||||
A copy of the site is hosted in GitHub at <a href="https://github.com/antenna2" target="_blank">github.com/antenna2</a>, the repo can be cloned, forked, or downloaded in ZIP archive under the green Code button.
|
||||
The site is hosted in a GitHub repository at <a href="https://github.com/antenna2" target="_blank">github.com/antenna2</a>, it can be cloned, forked, or downloaded in ZIP archive under the green Code button.
|
||||
</li>
|
||||
<li>
|
||||
September 2025: Moved the site from antenna2.net domain to GitHub Pages. Removes the dependence on a domain and hosting account, and simplifies making updates. The antenna2.net domain will remain active with a redirect in place, it is recommended to update any bookmarks and references with the new URL.
|
||||
</li>
|
||||
</ul>
|
||||
<br>
|
||||
@@ -83,8 +86,8 @@
|
||||
<h3>Contact Info</h3>
|
||||
<p>Feedback or suggestions are welcome, please contact Lonney K1LH at <a href="mailto:[email protected]">[email protected]</a>.</p>
|
||||
<h3> </h3>
|
||||
<p><a href="/">Index of sites</a> (on www.antenna2.net), and <a href="../reports/report30.html">visitor statistics</a>.</p>
|
||||
<p>© 2024 <a href="../disclaimer.html">Disclaimer</a>.</p>
|
||||
<p><a href="../">Index of sites</a> on antenna2.github.io.</p>
|
||||
<p>© 2025 <a href="../disclaimer.html">Disclaimer</a>.</p>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
Reference in New Issue
Block a user