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From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <D67F7E8F41FE4EBC951C94C6AF8B57E9@AGB> <E61BFB5F4E4543488D6AB72F5C88EA62@AGB> <C49982DBBD674577B81AFABE96F517D5@TraceyPC>
Date: Wed, 2 Mar 2011 23:18:41 -0000
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Subject: Re: LF: Corona Discharge - how to  prevent  ?
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You thinking of going into Pawnbroking Tracey :-))
Alan

----- Original Message ----- 
From: "Tracey Gardner" <tracey.gardner@talktalk.net>
To: <rsgb_lf_group@blacksheep.org>
Sent: Wednesday, March 02, 2011 10:59 PM
Subject: Re: LF: Corona Discharge - how to prevent ?



I recall that you can get copper cistern ball floats in various sizes, as
large as 12 inches diameter, would that be of any use?

Regards

Tracey

  ----- Original Message ----- 
  From: Graham
  To: rsgb_lf_group@blacksheep.org
  Sent: Wednesday, March 02, 2011 10:26 PM
  Subject: Re: LF: Corona Discharge - how to prevent ?


  Thanks  Alan , John.

  Yes that  seems  to be the solution , may be a  ball   would  do  the
same thing ?.. I was  wrangling with the charge  distribution angle .. as to
the  best  way  , assuming a  sharp point on the  ring  would  still
produce the  same  corona  ?

  The  double  stacked  ring  looked a  good  idea  , but  is  only  in 'one
plane'  what  happens  at  90  deg  ie  in front  and behind ...  ?

  The tube  has possibilities, I have some  copper brake  pipe , that
should  do the job .....

  Pity to  quench it, it  looks  quite impressive  in the  night  ! , (not
sure what its doing to the  local
  medium wave reception  though...)

  tnx - G..


  From: Graham
  Sent: Wednesday, March 02, 2011 8:32 PM
  To: rsgb_lf_group@blacksheep.org
  Subject: LF: Corona Discharge - how to prevent ?


  Corona Discharge - how to  prevent  ?

  Running  into  corona problems  with  a  small  loaded  antenna ,
terminating  as a  wire  at the far  end

  Q has any one  addressed  this  problem and  found a  suitable solution ?

  Apparently  more  prevalent on 136  khz , this  is  presenting  on 500k ,
I can  find  reference  to rounded  objects and  rings , one  being  two
sets  of ring's the  second  being  insulated to  reduce the  v/mm stress ,
but these  where  part of a  high  voltage insulator  with the  far  end
earthed , not so  in this  case, the  wire  ends in free  space ..

  Increasing the  surface  area  will  distribute  the  charge , but  will
not  reduce the stress  as this  is  a generated  field as opposed to a
static build up ?

  Links / ides ?

  Tnx - Graham ..





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