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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*Topband\:\s+Toploaded\s+vertical\s+\-\s+SWR\s*$/: 15 ]

Total 15 documents matching your query.

1. Topband: Toploaded vertical - SWR (score: 1)
Author: "Ashraf Chaabane" <ash.kf5eyy@gmail.com>
Date: Tue, 18 Sep 2018 20:44:33 +0000
Hi all, I just finished setting up my vertical antenna for 160 in 3V8SF location. It is 17m (55 ft) long with 2 top loading wires 12m each (40ft), angle to vertical about 40 deg. I added 8 radials, 2
/archives//html/Topband/2018-09/msg00136.html (7,753 bytes)

2. Re: Topband: Toploaded vertical - SWR (score: 1)
Author: S57AD <mirko.s57ad@gmail.com>
Date: Tue, 18 Sep 2018 22:54:19 +0200
Try with so called "hairpin match", actually several turns of wire bettween feedpoint and the ground (radials). Jou can then adjust the SWR squeezing or stretching the coil... 73, Mirko, S57AD V V to
/archives//html/Topband/2018-09/msg00137.html (7,889 bytes)

3. Re: Topband: Toploaded vertical - SWR (score: 1)
Author: "Joe Subich, W4TV" <lists@subich.com>
Date: Tue, 18 Sep 2018 19:19:14 -0400
1) move then ends of the top loading wires further out (flatter) 2) use a 4:1 auto-transformer at the feed point - your antenna analyzer says the real impedance is about 15 Ohms. A 4:1 auto-transform
/archives//html/Topband/2018-09/msg00138.html (7,767 bytes)

4. Re: Topband: Toploaded vertical - SWR (score: 1)
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Wed, 19 Sep 2018 13:36:12 -0300
An L network with a coil in series and a 500pf variable to ground might do the trick. You impedance of the antenna is to low and you need to bring it up. You can also try extending the top hat wires
/archives//html/Topband/2018-09/msg00139.html (8,159 bytes)

5. Re: Topband: Toploaded vertical - SWR (score: 1)
Author: Don Kirk <wd8dsb@gmail.com>
Date: Wed, 19 Sep 2018 13:29:22 -0400
_________________ Topband Reflector Archives - http://www.contesting.com/_topband
/archives//html/Topband/2018-09/msg00140.html (7,968 bytes)

6. Re: Topband: Toploaded vertical - SWR (score: 1)
Author: "Clive GM3POI" <clive@gm3poi.com>
Date: Wed, 19 Sep 2018 13:46:55 -0500
What I don't understand is why would you use more components than needed. Why a capacitor (possibly vacuum). What is wrong in using a hairpin which also DC shorts the vertical to ground. A combinatio
/archives//html/Topband/2018-09/msg00141.html (8,420 bytes)

7. Re: Topband: Toploaded vertical - SWR (score: 1)
Author: Tim Shoppa <tshoppa@gmail.com>
Date: Wed, 19 Sep 2018 14:41:58 -0400
Your suggestion of a hairpin is a high-pass. Herb's suggestion for a series-L shunt-C L-network is a low-pass. Sometimes you might prefer one over the other. Or choice might be entirely driven by par
/archives//html/Topband/2018-09/msg00142.html (9,815 bytes)

8. Re: Topband: Toploaded vertical - SWR (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Wed, 19 Sep 2018 12:22:10 -0700
2) use a 4:1 auto-transformer at the feed point - your antenna    analyzer says the real impedance is about 15 Ohms.  A 4:1    auto-transformer will get the SWR down to about 1.2:1. Generally speakin
/archives//html/Topband/2018-09/msg00143.html (8,778 bytes)

9. Re: Topband: Toploaded vertical - SWR (score: 1)
Author: Jean-Paul Albert via Topband <topband@contesting.com>
Date: Wed, 19 Sep 2018 21:49:20 +0200
f6aoj.ao-journal.com and then « tuning short vertical » , menu left side. It could help you to match your antenna. 73 to all. F6FYA / Jean-Paul Envoyé de mon iPad _________________ Topband Reflector
/archives//html/Topband/2018-09/msg00144.html (11,228 bytes)

10. Re: Topband: Toploaded vertical - SWR (score: 1)
Author: Grant Saviers <grants2@pacbell.net>
Date: Wed, 19 Sep 2018 15:36:53 -0700
Several suggestions, some already mentioned - Although your swr plot shows you are in the ballpark for resonance, the feedpoint resistance is very low, as mentioned likely 12 to 20 ohms.  A transmiss
/archives//html/Topband/2018-09/msg00148.html (10,962 bytes)

11. Re: Topband: Toploaded vertical - SWR (score: 1)
Author: Wes Stewart <wes_n7ws@triconet.org>
Date: Wed, 19 Sep 2018 15:53:24 -0700
I suspect your data.  For a 0.1 lambda vertical, the radiation resistance will be quite low particularly with sloping loading wires and with your radial system the ground loss will be high.  Addition
/archives//html/Topband/2018-09/msg00149.html (9,410 bytes)

12. Re: Topband: Toploaded vertical - SWR (score: 1)
Author: Wes N7WS <wes_n7ws@triconet.org>
Date: Wed, 19 Sep 2018 18:38:09 -0700
Me too. But I wasn't ready to present them yet. I'm away from home at the moment. Wes Sent from my iPhone _________________ Topband Reflector Archives - http://www.contesting.com/_topband
/archives//html/Topband/2018-09/msg00150.html (10,375 bytes)

13. Re: Topband: Toploaded vertical - SWR (score: 1)
Author: Don Kirk <wd8dsb@gmail.com>
Date: Thu, 20 Sep 2018 03:51:07 -0400
Hi Clive, Nothing wrong with the hairpin as you mentioned which I really consider to be a high pass L network (which N3QE eluded to) in which the L network capacitance is provided by the antenna (you
/archives//html/Topband/2018-09/msg00151.html (11,055 bytes)

14. Re: Topband: Toploaded vertical - SWR (score: 1)
Author: "Clive GM3POI" <clive@gm3poi.com>
Date: Thu, 20 Sep 2018 04:59:56 -0500
Don I should have mentioned that 1.9 or 1.89mhz is a very good figure to aim for before adding the hairpin. 73 Clive GM3POI Hi Clive, Nothing wrong with the hairpin as you mentioned which I really co
/archives//html/Topband/2018-09/msg00152.html (11,328 bytes)

15. Re: Topband: Toploaded vertical - SWR (score: 1)
Author: "Clive GM3POI" <clive@gm3poi.com>
Date: Thu, 20 Sep 2018 05:00:46 -0500
Yes Don, I find folding back the top loading easy. Then using a roller inductance to find the value needed to match it followed by the last stage of measuring the inductance and recreating it using A
/archives//html/Topband/2018-09/msg00153.html (11,215 bytes)

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