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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*LF\:\s+Capacitive\s+top\s+hat\s+question\s*$/: 17 ]

Total 17 documents matching your query.

1. LF: Capacitive top hat question (score: 1)
Author: Chris Wilson <[email protected]>
Date: Wed, 4 Nov 2015 16:29:25 +0000
04 November 2015 On my 136khz set up I have a short piece of ladder line (about 16 feet high, strapped together at the base only) feeding the corner of my horizontal quad loop, which is about 460 fee
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00067.html (9,407 bytes)

2. Re: LF: Capacitive top hat question (score: 1)
Author: John Rabson <[email protected]>
Date: Wed, 4 Nov 2015 17:51:03 +0100
I have no experience of this at 136, but I remember visiting Ernie G3ERN at his QTH in Harlow and finding that I could walk all around the back yard and light a fluorescent tube when he keyed his top
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00068.html (11,643 bytes)

3. Re: LF: Capacitive top hat question (score: 1)
Author: Andy Talbot <[email protected]>
Date: Wed, 4 Nov 2015 17:00:15 +0000
[email protected] Researching history of RABSON, BLACKSHAW, GAUNTLETT, VERLANDER and ROBSONNE
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00069.html (12,805 bytes)

4. Re: LF: Capacitive top hat question (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Wed, 04 Nov 2015 18:35:46 +0100
When I used to visit the Radio Club in Liverpool in the late 50s we met in a church hall just off Queens drive. One local with topband mobile parked in the drive would fire up 10W of top band take ou
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00070.html (14,720 bytes)

5. Re: LF: Capacitive top hat question (score: 1)
Author: "Graham" <[email protected]>
Date: Wed, 04 Nov 2015 20:59:52 +0100
(about 16 fee thigh, strapped together at the base only) I wonder what exactly is radiating Chris ? what to you estimate the beam pattern to be , I have the idea , south to SV is down , compared to s
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00071.html (11,095 bytes)

6. Re: LF: Capacitive top hat question (score: 1)
Author: Andy Talbot <[email protected]>
Date: Wed, 4 Nov 2015 20:00:44 +0000
A pretty thoroughly top loaded vertical, Heff = Hactual 'jnt On 4 November 2015 at 19:50, Graham <[email protected]> wrote: (about 16 fee thigh, strapped together at the base only) I wonder  wh
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00072.html (12,903 bytes)

7. Re: LF: Capacitive top hat question (score: 1)
Author: "Graham" <[email protected]>
Date: Wed, 04 Nov 2015 21:25:41 +0100
I dont think its that simple Andy , 16 ft is not much for 136 , and the loop runs up from the feed point , which I think is a corner ,, so at what point is it a radiating element and which point is i
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00073.html (14,117 bytes)

8. Re: LF: Capacitive top hat question (score: 1)
Author: Andy Talbot <[email protected]>
Date: Wed, 4 Nov 2015 21:11:09 +0000
I dont think its  that  simple Andy ,   16 ft is  not  much  for  136 ,  and the  loop  runs  up from  the  feed  point , which I think  is  a  corner ,, so  at  what  point  is  it a radiating  ele
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00076.html (17,038 bytes)

9. Re: LF: Capacitive top hat question (score: 1)
Author: "Graham" <[email protected]>
Date: Fri, 06 Nov 2015 19:48:35 +0100
Not sure why you talk about wire separation, Verticals properly are quire simple, this is not a pure vertical and not very simple to evaluate , Your making the assumption, that the system stops radia
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00103.html (18,148 bytes)

10. Re[2]: LF: Capacitive top hat question (score: 1)
Author: Chris Wilson <[email protected]>
Date: Fri, 6 Nov 2015 20:15:51 +0000
Hello Graham, Friday, November 6, 2015 I am very interested in trying to understand how this thing is radiating, to be honest, given how low the loop is where it is fed by the vertical, and its close
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00106.html (12,178 bytes)

11. Re: LF: Capacitive top hat question (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Sat, 07 Nov 2015 12:03:04 +0100
To all intents and purposes a short (in wavelengths) vertical attached to an arrangement of horizontal wires is a simple (capacitively) loaded vertical. The horizontal part will radiate, especially i
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00115.html (17,437 bytes)

12. Re[2]: LF: Capacitive top hat question (score: 1)
Author: Chris Wilson <[email protected]>
Date: Sat, 7 Nov 2015 11:19:05 +0000
Hello Mike, Saturday, November 7, 2015 Thanks for the info Mike, as always! Is there any real benefit in having the vertical section centralised within the top hat capacitive array, be it a horizonta
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00117.html (13,108 bytes)

13. LF: Capacitive top hat question (score: 1)
Author: M0FMT <[email protected]>
Date: Sat, 7 Nov 2015 13:07:07 +0000
Try http://www.strobbe.eu/on7yd/136ant/ 73 es GL Pete M0FMT IO91UX
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00123.html (9,511 bytes)

14. Re: LF: Capacitive top hat question (score: 1)
Author: DK7FC <[email protected]>
Date: Sun, 08 Nov 2015 20:49:25 +0100
Hi Mike, Am 07.11.2015 11:58, schrieb Mike Dennison: [...] Several unbelievers have tried using purely horizontal transmitting antennas and have had poor results. The beauty of amateur radio is that
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00169.html (11,065 bytes)

15. RE: LF: Capacitive top hat question (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Sun, 8 Nov 2015 20:07:00 +0000
Hello Stefan, Mike, I assume that a good working dipole at very low height (4m = 0.6% of lambda) is due to a poor soil. I remember to have read somewhere thate (French?) military in the Sahara desert
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00173.html (12,048 bytes)

16. Re: LF: Capacitive top hat question (score: 1)
Author: Paul Nicholson <[email protected]>
Date: Sun, 08 Nov 2015 21:05:37 +0000
Somewhere I have a paper describing something like that. I recall an antenna at ground level or actually a little buried, and its effective height was related to the depth of the water table below t
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00177.html (10,813 bytes)

17. Re: LF: Capacitive top hat question (score: 1)
Author: LineOne <[email protected]>
Date: Mon, 09 Nov 2015 10:33:31 +0000
Somewhere I have a paper describing something like that. I recall an antenna at ground level or actually a little buried, and its effective height was related to the depth of the water table below th
/rsgb_lf_group-archives/html/rsgb_lf_group/2015-11/msg00189.html (11,101 bytes)


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