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Date: Thu, 23 Sep 2010 21:28:09 +0100
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From: Roger Lapthorn <rogerlapthorn@gmail.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: 137 WSPRing
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I'd like to see the schematic Andy please, especially what you (and others)
use for PA chokes and transformers. Sorry cannot TX or monitor until the
weekend here (grandson QRM).

73s
Roger G3XBM

On 23 September 2010 21:01, Andy Talbot <andy.g4jnt@googlemail.com> wrote:

> Has everyone turned off their monitors?    Plenty of reports from  four
> stations throughout the day at distances up to 376km (F5WK in JN18HP)  then
> all stop at 1740z.
>
> Still radiating, about 40W into the antenna now.   I've optimised the
> PA output by changing the transformer and added a few tap positions for
> loads from 50 to 150 ohms.   If there's any interest in this rather standard
> linear PA, I'l  write it up - if not, shan't bother.    The FETs would have
> to be substituted anyway.
>  Andy
> www.g4jnt.com
>



-- 
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
G3XBM   GQRP 1678    ISWL G11088

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I&#39;d like to see the schematic Andy please, especially what you (and ot=
hers) use for PA chokes and transformers. Sorry cannot TX or monitor until=
 the weekend here (grandson QRM).<br><br>73s<br>Roger G3XBM<br><br><div cl=
ass=3D"gmail_quote">
On 23 September 2010 21:01, Andy Talbot <span dir=3D"ltr">&lt;<a href=3D"m=
ailto:andy.g4jnt@googlemail.com">andy.g4jnt@googlemail.com</a>&gt;</span>=
 wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin: 0pt 0pt 0pt=
 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div>Has everyone turned off their monitors?=A0=A0=A0 Plenty of reports fr=
om=A0 four stations throughout the day at distances up to 376km (F5WK in=
 JN18HP)=A0 then all stop at 1740z.=A0 </div>
<div>=A0</div>
<div>Still radiating, about 40W into the antenna now.=A0=A0 I&#39;ve optim=
ised the PA=A0output by=A0changing the transformer and added a few tap pos=
itions for loads from 50 to 150 ohms.=A0=A0 If there&#39;s any interest in=
 this rather standard linear PA, I&#39;l=A0 write it up - if not, shan&#39=
;t bother.=A0=A0=A0 The FETs would have to be substituted anyway.<br clear=
=3D"all">

</div>
<div>Andy<br><a href=3D"http://www.g4jnt.com" target=3D"_blank">www.g4jnt.=
com</a><br></div>
</blockquote></div><br><br clear=3D"all"><br>-- <br><a href=3D"http://g3xb=
m-qrp.blogspot.com/" target=3D"_blank">http://g3xbm-qrp.blogspot.com/</a><=
br><a href=3D"http://www.g3xbm.co.uk" target=3D"_blank">http://www.g3xbm.c=
o.uk</a><br>
<a href=3D"http://www.youtube.com/user/g3xbm" target=3D"_blank">http://www=
.youtube.com/user/g3xbm</a><br>G3XBM=A0=A0 GQRP 1678=A0=A0=A0 ISWL G11088<=
br>

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