Message-ID: <508955B8.6050305@iup.uni-heidelberg.de>
Date: Thu, 25 Oct 2012 17:07:36 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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References: <CAHAQVWNXyu8L0g-NNb4pGoUK=x2sDkpvuKvs=5-gTq2sLMwxDA@mail.gmail.com> <505B92F1.8080401@iup.uni-heidelberg.de> <505C72D3.1090006@telia.com>
In-Reply-To: <505C72D3.1090006@telia.com>
Subject: Re: LF: Homebrew stuff
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LF,

There's some progress on the AM modulator stage here. Now the step down=20
converter works in general, i just have to optimise the PID parameters,=20
i.e. regulator performance. Main parts of the stage are an IRFP460A,=20
IR2113, TL494, IXDD414CI.
https://dl.dropbox.com/u/19882028/LF/step%20down%20converter.JPG
The inductor is using a single turn on an Epcos B64290L699X830=20
<https://dl.dropbox.com/u/19882028/Datenbl%C3%A4tter/B64290L699X830.pdf>=20
ferrite core with an Al of 10.8uH.

Hopefully i can soon run slow hell transmissions in the LF QRSS-60 EU=20
slot without generating sidebands...

73, Stefan/DK7FC

Am 21.09.2012 15:59, schrieb Johan H. Bodin:
> Stefan Sch=E4fer skrev 2012-09-21 00:04:
>   =20
>> https://dl.dropbox.com/u/19882028/LF/SDC1.JPG
>> An add-on to my LF PA. Guess what it is?! :-)
>>     =20
> Hi Stefan,
>
> I'd guess it is the power section of a PWM AM modulator for one of your
> switching QRO amplifiers?
>
> 73
> Johan SM6LKM
>
>   =20

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LF, <br>
<br>
There's some progress on the AM modulator stage here. Now the step down
converter works in general, i just have to optimise the PID parameters,
i.e. regulator performance. Main parts of the stage are an IRFP460A,
IR2113, TL494, IXDD414CI.<br>
<a class="moz-txt-link-freetext" href="https://dl.dropbox.com/u/19882028/LF/step%20down%20converter.JPG">https://dl.dropbox.com/u/19882028/LF/step%20down%20converter.JPG</a><br>
The inductor is using a single turn on an Epcos <a
 href="https://dl.dropbox.com/u/19882028/Datenbl%C3%A4tter/B64290L699X830.pdf">B64290L699X830</a>
ferrite core with an Al of 10.8uH.<br>
<br>
Hopefully i can soon run slow hell transmissions in the LF QRSS-60 EU
slot without generating sidebands...<br>
<br>
73, Stefan/DK7FC<br>
<br>
Am 21.09.2012 15:59, schrieb Johan H. Bodin:
<blockquote cite="mid:505C72D3.1090006@telia.com" type="cite">
  <pre wrap="">Stefan Sch&auml;fer skrev 2012-09-21 00:04:
  </pre>
  <blockquote type="cite">
    <pre wrap=""><a class="moz-txt-link-freetext" href="https://dl.dropbox.com/u/19882028/LF/SDC1.JPG">https://dl.dropbox.com/u/19882028/LF/SDC1.JPG</a>
An add-on to my LF PA. Guess what it is?! :-)
    </pre>
  </blockquote>
  <pre wrap="">
Hi Stefan,

I'd guess it is the power section of a PWM AM modulator for one of your
switching QRO amplifiers?

73
Johan SM6LKM

  </pre>
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