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LF: RE: RE: Re: RE: COIL WINDING THOUGHT

To: <[email protected]>
Subject: LF: RE: RE: Re: RE: COIL WINDING THOUGHT
From: "James Cowburn" <[email protected]>
Date: Tue, 8 Jun 2010 15:59:10 +0100
Cc: "'Chris Osborn'" <[email protected]>
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I think we’ll do the single layer route and thus be readily upgradeable, rather than risk setting fire to Chris’ shed and my garage!! B (or perhaps Mal, that was your evil plan all along….??!!!!   J )

 

 


From: owner-[email protected] [mailto:owner-[email protected]] On Behalf Of Rik Strobbe
Sent: 08 June 2010 15:20
To: [email protected]
Subject: LF: RE: Re: RE: COIL WINDING THOUGHT

 

Just had a look at a roll of 8 stranded wire (Belden) : it is rated 300Vrms

Assuming  an antenna capacitance of 500pF (= 35kOhm at 9kHz) you only need 8.5mA through the coil to generate 300V.

 

73, Rik  ON7YD

 


Van: owner-[email protected] [owner-[email protected]] namens mal hamilton [[email protected]]
Verzonden: dinsdag 8 juni 2010 16:04
Aan: [email protected]
Onderwerp: LF: Re: RE: COIL WINDING THOUGHT

Jim and Co will hardly be involved with 30kv more like 3kv or less

They will let us know

g3kev

 

 

----- Original Message -----

From: Rik Strobbe

Sent: Tuesday, June 08, 2010 2:47 PM

Subject: LF: RE: COIL WINDING THOUGHT

 

Beware of the very high voltages between the strands.

Stefan mentioned up to 30kV loading coil voltage, I guess even a fraction of this voltage will cause arcing between the strands

In addition the high stray capacitance will reduce the Q.

 

73, Rik  ON7YD

 


Van: [email protected] [owner-[email protected]] namens mal hamilton [[email protected]]
Verzonden: dinsdag 8 juni 2010 15:15
Aan: rsgb
Onderwerp: LF: COIL WINDING THOUGHT

All vlf men

Instead of winding miles of single strand insulated wire to achive the required inductance, use instead insulated multi strand wire and series the strands, normally the individual strands have coloured insulation and convenient to connect in series.

also

gather up all the ferrite cores you can find put into a suitable container and insert into coil.

The above idea might save some coil winding time.

 

another thouight while I am composing

 

Litz wire.

 

Get hold of some old Decca coils ( I have a couple) find the beginning and end and do the same as above, this however is more difficult although individually insulated they are all the same colour, but with a meter to identify each strand it can be done

 

de mal/g3kev

 

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