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Re: LF: EbNaut from Todmorden

To: [email protected]
Subject: Re: LF: EbNaut from Todmorden
From: DK7FC <[email protected]>
Date: Thu, 10 Mar 2016 23:59:45 +0100
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Hi Paul,

Am 10.03.2016 23:29, schrieb Paul Nicholson:
The coils of the T filter wound on ferrite toroids get very
hot very quickly.  It's the ferrite producing the heat not
the wire.  I must have the wrong flavour of ferrite so I
ordered some different ones (nice blue EPCOS ones) but they
wont arrive till Monday.  Meanwhile I'll wind some air cored
coils for the filter.
The ferrite seems to saturate.
I recommend using iron power cores of -2 type (everywhere available, cheap, well working world wide). For your power level, T106-2 or maybe T130-2 types are suitable. A T200-2 can be used for 1 kW when wound to j50 Ohm at LF.

73, Stefan
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