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From: Andy Talbot <andy.g4jnt@gmail.com>
Date: Wed, 21 Nov 2018 14:23:04 +0000
Message-ID: <CAA8k23TqyN2RPTA=eN8XWbz=PdQrO0uG8jTJGi2i==6nZ730YQ@mail.gmail.com>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: On air again in LF WSPR-15
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Contragulations,  That is the ONLY other design I have seen for a LF
amplifier using directly rectified mains. apart from my own half-bridge
version http://g4jnt.com/137tx.pdf     After building that, I always
intended doing a full bridge one, but never got round to it - was a bit
scared I suspect, and back then FETs were more expensive than they are now.

Andy
www.g4jnt.com


On Wed, 21 Nov 2018 at 14:10, DK7FC <selberdenken@posteo.de> wrote:

> Hi Chris,
>
> Yes i published it on Dropbox a few years ago but i think the link
> doesn't work any more. I attach the two images here, the size is small
> enough.
>
> 73, Stefan
>
> Am 21.11.2018 14:40, schrieb Chris Wilson:
> >
> > Hello DK7FC,
> >
> > Is  the  H bridge amp a published design Stefan, and if not, would you
> > consider posting it please? :)
> >
> > Wednesday, November 21, 2018, 1:00:23 PM, you wrote:
> >
> >
> >>
> >>   Hi Luis,
> >>
> >>   thanks for the nice readably summary report.
> >>   Oh yes it was an impressing night and good resultsfor us. I saw
> >> you were decoded at SM2DJK which is a good distance, and R7NT was
> >> seen at 2E0ILY. There are more challenges like the path from EB8ARZ
> >> to SM2DJK, that would be about 4000 km and still inside the continent.
> >>   I also thought about LU8YD but also about PY2PLL.
> >>   EB8ARZ has the perfect RX location, so if LU8YD would transmit on
> >> LF, like in the past, it could work in WSPR-15 just before the sunrise
> in EA8.
> >>
> >>   About the MOSFET discussion, i'm using IRFP460A types in H bridge
> >> configurations from SLF to MF, i.e. the full spectrum :-) Bridge
> >> voltage is 320 V DC, the rectified mains voltage.
> >>   With the currently pair (4 pcs) of FETs i'm TXing since hundreds
> >> of hours on LF without problems. They are of course in TO-247 design
> >> and cost just 2.2 EUR, so a BANG/year wouldn't really hurt.
> >>
> >>   73, Stefan
> >>
> >
> >
>

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<div dir=3D"ltr"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"fon=
t-family:tahoma,sans-serif;font-size:small">Contragulations,=C2=A0 That is =
the ONLY other design I have seen for a LF amplifier using directly rectifi=
ed mains. apart from my own half-bridge version=C2=A0<a href=3D"http://g4jn=
t.com/137tx.pdf">http://g4jnt.com/137tx.pdf</a>=C2=A0 =C2=A0 =C2=A0After bu=
ilding that, I always intended doing a full bridge one, but never got round=
 to it - was a bit scared I suspect, and back then FETs were more expensive=
 than they are now.</div><div class=3D"gmail_default" style=3D"font-family:=
tahoma,sans-serif;font-size:small"><br></div><div><div dir=3D"ltr" class=3D=
"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"l=
tr"><div><div dir=3D"ltr"><div><div dir=3D"ltr">Andy<div><span style=3D"fon=
t-size:12.8px"><a href=3D"http://www.g4jnt.com" target=3D"_blank">www.g4jnt=
.com</a></span><br></div><div><br></div></div></div></div></div></div></div=
></div></div></div></div></div><br></div></div><br><div class=3D"gmail_quot=
e"><div dir=3D"ltr">On Wed, 21 Nov 2018 at 14:10, DK7FC &lt;<a href=3D"mail=
to:selberdenken@posteo.de">selberdenken@posteo.de</a>&gt; wrote:<br></div><=
blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px=
 #ccc solid;padding-left:1ex">Hi Chris,<br>
<br>
Yes i published it on Dropbox a few years ago but i think the link <br>
doesn&#39;t work any more. I attach the two images here, the size is small =
<br>
enough.<br>
<br>
73, Stefan<br>
<br>
Am 21.11.2018 14:40, schrieb Chris Wilson:<br>
&gt;<br>
&gt; Hello DK7FC,<br>
&gt;<br>
&gt; Is=C2=A0 the=C2=A0 H bridge amp a published design Stefan, and if not,=
 would you<br>
&gt; consider posting it please? :)<br>
&gt;<br>
&gt; Wednesday, November 21, 2018, 1:00:23 PM, you wrote:<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 <br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0Hi Luis,<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0thanks for the nice readably summary report.<br>
&gt;&gt;=C2=A0 =C2=A0Oh yes it was an impressing night and good resultsfor =
us. I saw<br>
&gt;&gt; you were decoded at SM2DJK which is a good distance, and R7NT was<=
br>
&gt;&gt; seen at 2E0ILY. There are more challenges like the path from EB8AR=
Z<br>
&gt;&gt; to SM2DJK, that would be about 4000 km and still inside the contin=
ent.<br>
&gt;&gt;=C2=A0 =C2=A0I also thought about LU8YD but also about PY2PLL.<br>
&gt;&gt;=C2=A0 =C2=A0EB8ARZ has the perfect RX location, so if LU8YD would =
transmit on<br>
&gt;&gt; LF, like in the past, it could work in WSPR-15 just before the sun=
rise in EA8.<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0About the MOSFET discussion, i&#39;m using IRFP460A ty=
pes in H bridge<br>
&gt;&gt; configurations from SLF to MF, i.e. the full spectrum :-) Bridge<b=
r>
&gt;&gt; voltage is 320 V DC, the rectified mains voltage.<br>
&gt;&gt;=C2=A0 =C2=A0With the currently pair (4 pcs) of FETs i&#39;m TXing =
since hundreds<br>
&gt;&gt; of hours on LF without problems. They are of course in TO-247 desi=
gn<br>
&gt;&gt; and cost just 2.2 EUR, so a BANG/year wouldn&#39;t really hurt.<br=
>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A073, Stefan<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 <br>
&gt;<br>
&gt;=C2=A0 =C2=A0 <br>
</blockquote></div>

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