Re: AW: [TCML] COUNTERPOISE

[Mddeming@xxxxxxx]

Hi Fritz, 
 
I've only built one, so I can't tell you the optimal number of wires. I  used 
12 bare copper wires across the diameter, tied and soldered in the middle  
with another loop of wire for the secondary connection, and spread at 15 degree  
intervals. One could use 18 wires at 10 degrees. I don't know if you should 
go  with less than 12 wires (24 spokes) because it should "look" dense to the  
RF.
 
Matt D.
 
 
In a message dated 7/23/2008 5:41:20 P.M. Eastern Daylight Time,  
fritz@xxxxxxxxxxxxxx writes:

Thank  you very much Gary, Matt, All,

The "Wheel spoke" layout of the  counterpoise (radially layed out wires on
the floor) is interesting, I  "feel" this must be the most efficient, short
path directly back to the  base center of the coil, for all them electrons
that shot out from the  toroid to the surounding ...?!

However, I wounder, why the "Backflow"  throu a foil (or a sheetmetal?)
counterpoise is less  efficient?

"Wheel spoke" layout, how many "spokes" are succested to  your experiance? 4?
8? 10? more?

Thank you again for your estimated  information, Fritz


Re: [TCML] COUNTERPOISE

Abends  Fritz,

I only see a few possible problems with a   long cable to ground:

1. A long cable will tend to induce RF currents  into any wire it  passes
parallel to.
2. A long cable might act as  a "bias resistor" to keep the base of the coil

at several thousand  volts above ground potential. This is especially bad if

you have one  side of the primary connected to the base of the secondary.  If
the
primary is "floating" then it is not so bad.
3. Streamers will  tend to "target" this cable for ground strikes.
4. With a well-designed  counterpoise, it isn't necessary.

In terms of eddy currents, the least  efficient counterpoise is a foil disk,

next best is a wire mesh disk,  and best is a large number of wires  laid out

in a "wagon-wheel"  pattern with the coil at the hub.

Matt D.



In a message  dated 7/23/2008 12:19:26 P.M. Eastern Daylight Time,
fritz@xxxxxxxxxxxxxx  writes:

Dear  spark afficionados,

Supposed we have a  counterpoise as HF  "earth"   and also a not very  good
conventional earth rod  connection available (supposed long  cable, too high
impedance, too dry  ground etc.), woud it be a  advantage, to connect this
"not so perfect"  ground post earth to the  counterpoise-? Or should this
better not be done  for some  reason?
Or looked from other end, can a not very satisfactory  earth  post HF ground
be improoved with a additional   counterpoise-?

(It is understood as was explained in earlyer  postings,  that the
counterpoise shall not be connected to the house  mains earth, so  this is
not
the object)

Thank you for a  answer,    Fritz


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