[Amps] Ferrite Core for 160M PI Output ?

[Peter Voelpel]

When I use multiple cores I glue them together with two component epoxy
first and then I insulate and wind them, much easier.

73
Peter

-----Original Message-----
From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Jim Thomson
Sent: Dienstag, 13. Juni 2017 11:42
To: amps at contesting.com
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

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