Search String: Display: Description: Sort:

Results:

References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*Topband\:\s+Vertical\s+choke\s+needed\?\s*$/: 21 ]

Total 21 documents matching your query.

1. Topband: Vertical choke needed? (score: 1)
Author: Kenneth Silverman <kenny.k2kw@gmail.com>
Date: Thu, 31 Dec 2020 19:15:48 -0500
Hello, I have an inverted-L and the radials are laying on the ground AND the coax is on the ground too with radials right near the coax run. Do I need a choke to stop any feedline coupling/radiation,
/archives//html/Topband/2020-12/msg00274.html (6,784 bytes)

2. Re: Topband: Vertical choke needed? (score: 1)
Author: Michael Walker <va3mw@portcredit.net>
Date: Thu, 31 Dec 2020 20:01:16 -0500
Hi Ken Chokes at both ends of the feed line are always a good idea. I have a similar setup to you but with elevated radials and I have Mix 31 chokes right at the base of the antenna with an UNUN sinc
/archives//html/Topband/2020-12/msg00276.html (8,037 bytes)

3. Re: Topband: Vertical choke needed? (score: 1)
Author: Kenny Silverman <kenny.k2kw@gmail.com>
Date: Thu, 31 Dec 2020 20:23:03 -0500
Thanks Mike. I wasnt sure if one was needed where the coax exits the radial field Regards , Kenny K2KW _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
/archives//html/Topband/2020-12/msg00277.html (7,997 bytes)

4. Re: Topband: Vertical choke needed? (score: 1)
Author: Wes <wes_n7ws@triconet.org>
Date: Thu, 31 Dec 2020 19:49:43 -0700
I have the same situation and no choke.  IMHO the transmission line is just another random length radial.  I don't have chokes on any of the others either. Wes  N7WS The antenna is in the woods so bu
/archives//html/Topband/2020-12/msg00278.html (7,515 bytes)

5. Re: Topband: Vertical choke needed? (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Thu, 31 Dec 2020 22:09:33 -0500
Kenny My personal experience with radials on the ground is that with a fair number (16 or more) that I end up with little if any common mode currents on the coax . Smaller (numbers of) ground mounted
/archives//html/Topband/2020-12/msg00279.html (9,062 bytes)

6. Re: Topband: Vertical choke needed? (score: 1)
Author: Michael Walker <va3mw@portcredit.net>
Date: Thu, 31 Dec 2020 22:22:27 -0500
Hi Wes The chokes do a few things. For transmitting, they keep the RF off the feedline. It is critical for RX and TX. Just as importantly, they keep RF and Noise off the feedline while receiving, and
/archives//html/Topband/2020-12/msg00280.html (9,612 bytes)

7. Re: Topband: Vertical choke needed? (score: 1)
Author: Wes <wes_n7ws@triconet.org>
Date: Thu, 31 Dec 2020 23:21:25 -0700
Hi Mike, I've read all of that stuff and more many times.  Frankly, I'm not motivated to put a 10 pound lump of ferrite on every wire into or out of my shack.  It appears that common-mode chokes and
/archives//html/Topband/2021-01/msg00000.html (10,333 bytes)

8. Re: Topband: Vertical choke needed? (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 1 Jan 2021 01:19:38 -0800
Chokes at both ends of the feed line are always a good idea. At the base of the antenna, yes, so that the feedline doesn't become a radial. More are probably wasted money. See my latest Cookbook at k
/archives//html/Topband/2021-01/msg00001.html (9,384 bytes)

9. Re: Topband: Vertical choke needed? (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 1 Jan 2021 01:23:44 -0800
Hi Wes, The chokes in my latest Cookbook weigh a LOT less than that. I won't debate your engineering judgement about whether one is needed on your antenna. You're as good an engineer as anyone on thi
/archives//html/Topband/2021-01/msg00002.html (8,068 bytes)

10. Re: Topband: Vertical choke needed? (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 1 Jan 2021 01:29:28 -0800
I haven't read the link, but common mode current follows the behavior of the feedline as an antenna, so common mode current distribution along the feedline will vary as with a piece of wire having th
/archives//html/Topband/2021-01/msg00003.html (8,039 bytes)

11. Re: Topband: Vertical choke needed? (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Fri, 1 Jan 2021 05:19:36 -0500
Jim/ K9YC I am with you 100% on your comments below my 80/ 160 verticals all run "10 lbs of ferrite" at the feed points but that is because I run elevated non resonant radials these days. 5lbs of fer
/archives//html/Topband/2021-01/msg00004.html (10,695 bytes)

12. Re: Topband: Vertical choke needed? (score: 1)
Author: Michael Walker <va3mw@portcredit.net>
Date: Fri, 1 Jan 2021 08:52:21 -0500
Wes That is an option you have and no one is making anything do anything. It is 100% up to you. Happy New Year _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Refl
/archives//html/Topband/2021-01/msg00006.html (11,475 bytes)

13. Re: Topband: Vertical choke needed? (score: 1)
Author: <n0tt1@juno.com>
Date: Fri, 1 Jan 2021 19:10:04 +0000
To offer another view.....IMHO Measure the impedance at the base of the antenna without the feedline attached in any way. While watching your instrument (259B, VNA, etc), touch the feedline *shield*
/archives//html/Topband/2021-01/msg00008.html (9,149 bytes)

14. Re: Topband: Vertical choke needed? (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 1 Jan 2021 11:54:01 -0800
The logic is good, but most instruments are probably not sufficiently sensitive to see the difference. 73, Jim K9YC On 1/1/2021 11:10 AM, n0tt1@juno.com wrote: To offer another view.....IMHO Measure
/archives//html/Topband/2021-01/msg00009.html (8,208 bytes)

15. Re: Topband: Vertical choke needed? (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Fri, 1 Jan 2021 14:01:09 -0600
You bet they do! Otherwise, the coax feedline on the ground seriously degrades the antenna's performance! I don't recall anyone mentioning this important fact in these recent threads here. See https:
/archives//html/Topband/2021-01/msg00010.html (8,984 bytes)

16. Re: Topband: Vertical choke needed? (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Fri, 1 Jan 2021 15:09:06 -0500
True indeed Charlie It was such an observation by accident that clued me into the fact that I needed a choke on a system with elevated radials the first time :) Dave NR1DX On 1/1/2021 2:10 PM, n0tt1@
/archives//html/Topband/2021-01/msg00011.html (11,064 bytes)

17. Re: Topband: Vertical choke needed? (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Fri, 1 Jan 2021 14:09:19 -0600
This link at to top of that page is a must-read, too. https://web.archive.org/web/20180923221943/http://lists.contesting.com/_topband/2007-11/msg00248.html. Guess I might as well include the text...
/archives//html/Topband/2021-01/msg00012.html (16,072 bytes)

18. Re: Topband: Vertical choke needed? (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Fri, 1 Jan 2021 14:58:27 -0600
Check out those links on my old ground radials page, especially the ones by N6LF. See what you think. :-) 73, Mike W0BTU _________________ Searchable Archives: http://www.contesting.com/_topband - To
/archives//html/Topband/2021-01/msg00013.html (19,033 bytes)

19. Re: Topband: Vertical choke needed? (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 1 Jan 2021 13:28:52 -0800
N6LF's work on this showed that imbalance of the current in elevated radials can significantly reduce field strength. Imbalance can be caused by differences in heights, lengths, and soil underneath t
/archives//html/Topband/2021-01/msg00015.html (9,404 bytes)

20. Re: Topband: Vertical choke needed? (score: 1)
Author: Jim Borowski <jim.gmforum@gmail.com>
Date: Fri, 01 Jan 2021 20:17:01 -0600
I measured my 160m top hat antenna 4600uh plus. Took 600pf on series and 250pf parallel to tune it.Jim K9TFSent from my T-Mobile 4G LTE Device _________________ Searchable Archives: http://www.contes
/archives//html/Topband/2021-01/msg00023.html (8,085 bytes)

Current List: 1 - 20
Page: [1] [2]
This search system is powered by Namazu