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From: Andy Talbot <andy.g4jnt@gmail.com>
Date: Sun, 24 Dec 2017 12:40:15 +0000
Message-ID: <CAA8k23RghsUZT2-PSSg4Mr90D7WX5TvERuyZU3tjExUs=tzLTg@mail.gmail.com>
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: TXing 2200m WSPR
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Are you sure your 50uH choke is doing its job?    9t to get 50uH suggests
ferrite witout a gap.  IN which case FDC thought the winding will be
saturating the ferrite, driving it into non linearity and reduced L

Use iron dust or GAPPED ferrite

Andy  G4JNT


On 24 December 2017 at 12:26, DK7FC <selberdenken@posteo.de> wrote:

> Hi Paul,
>
> Am 23.12.2017 23:36, schrieb N1BUG:
>
>> For anyone trying to follow along, this is my current version:
>>
>> http://n1bug.com/ASB_LF_Amp-20171223.jpg
>>
>
> The circuit looks good to me now. Maybe it helps to use a low pass filter
> in T configuration instead of a PI config. The T config starts with a
> series L. The PI config starts with a parallel C. That could make a
> significant difference for the harmonics.
>
> 73 and Merry christmas, Stefan
>
>

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<div dir=3D"ltr">Are you sure your 50uH choke is doing its job?=C2=A0 =C2=
=A0 9t to get 50uH suggests ferrite witout a gap.=C2=A0 IN which case FDC t=
hought the winding will be saturating the ferrite, driving it into non line=
arity and reduced L<div><br></div><div>Use iron dust or GAPPED ferrite</div=
><div><br></div><div>Andy=C2=A0 G4JNT</div><div><br></div></div><div class=
=3D"gmail_extra"><br><div class=3D"gmail_quote">On 24 December 2017 at 12:2=
6, DK7FC <span dir=3D"ltr">&lt;<a href=3D"mailto:selberdenken@posteo.de" ta=
rget=3D"_blank">selberdenken@posteo.de</a>&gt;</span> wrote:<br><blockquote=
 class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc soli=
d;padding-left:1ex">Hi Paul,<br>
<br>
Am 23.12.2017 23:36, schrieb N1BUG:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
For anyone trying to follow along, this is my current version:<br>
<br>
<a href=3D"http://n1bug.com/ASB_LF_Amp-20171223.jpg" rel=3D"noreferrer" tar=
get=3D"_blank">http://n1bug.com/ASB_LF_Amp-20<wbr>171223.jpg</a><br>
</blockquote>
<br>
The circuit looks good to me now. Maybe it helps to use a low pass filter i=
n T configuration instead of a PI config. The T config starts with a series=
 L. The PI config starts with a parallel C. That could make a significant d=
ifference for the harmonics.<br>
<br>
73 and Merry christmas, Stefan<br>
<br>
</blockquote></div><br></div>

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