[Amps] Ferrite Core for 160M PI Output ?

[Carl]

----- Original Message ----- 
From: "Jim Thomson" <jim.thom at telus.net>
To: <amps at contesting.com>
Sent: Tuesday, June 13, 2017 5:41 AM
Subject: [Amps] Ferrite Core for 160M PI Output ?


> Date: Mon, 12 Jun 2017 15:44:33 -0700
> From: Paul Baldock <paul at paulbaldock.com>
> To: "Carl" <km1h at jeremy.qozzy.com>,<amps at contesting.com>
> Subject: Re: [Amps] Ferrite Core for 160M PI  Output ?
>
> <I understand insulating between the wire and the core, but why do you
> <need to insulate the two cores from each other?
>
> ##  Extra reliability.   If each core is wrapped 1st...then its wrapped 
> 360 deg
> around each core.   If you instead  wrap the entire mess of stacked cores, 
> you
> end up with  air gaps here and there.   Do both, and its bullet proof, 
> with no
> surprises.
>
> ##  If you use polyimide wire..which I believe is the same as kapton.... 
> for the
> magnet wire, in the bigger gauges, its  15 kv rated.    Like for 
> 14-12-10-8 gauge.
>
> ##  Then it becomes  30 kv between adjacent turns  and  15+  between wire 
> and cores.
> But polyimide magnet wire is not cheap.   But its bomb proof..and cheap 
> insurance.
>
> ##  If you really want to go crazy,  you can also slide some teflon 
> spaghetti tubing over the
> polyimide wire.  Array solutions uses that technique on some of its  9-1 
> un-uns and other applications.
>
> ## On a side note, If I remember correctly, the Ameritron amps used 
> torroids on 160m..and maybe 80m as well.
> They used a PI-L on 160m,  and maybe 80m too..and def a PI on the other 
> bands.
> The idea was to be able to use a smaller load cap, and or less padding. 
> I believe their was an issue when running
> RTTY on 160m, or any other CCS data mode.  The torroids cooked.   If I 
> remember the story, Ameritrons response
> was they assumed no one would operate RTTY on 160m.
>
> Jim  VE7RF
>

** That noise should be banned below 1850 (-;



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