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Date: Tue, 23 Nov 2010 12:57:04 +0000 (GMT)
From: Chris Osborn <g3xiz@yahoo.co.uk>
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <4CEAE16C.5030101@iup.uni-heidelberg.de>
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Subject: Re: LF: VLF G3XIZ - QRT
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Hello Stefan / LF,

All was going last night well until I=A0heard sparking from the aerial=20
distribution box each
time the carrier was turned off.

After about 45 minutes the PA FET's blew up.

I did some investigation and found that the output transformer has=20
developed=A0some
short-circuited turns and so is now useless.

The loading coil seems unharmed so once I get a replacement transformer an=
d=20
connect=A0in some=20

new FET's I'll be back in business.

I'll=A0slow down=A0the rise and fall times of the pulse train from the dri=
ver unit=20
to the FET's and hopefully cure the sparking.

(Mal)=20
Yes,=A0N.O.V. holders=A0must get prior permission before=A0they transmit=
 and must stay=20
by the telephone for the duration.

Thanks to all those who looked for my signals.

73=20
Chris G3XIZ


=A0



________________________________
From: Stefan Sch=E4fer <schaefer@iup.uni-heidelberg.de>
To: rsgb_lf_group@blacksheep.org
Sent: Mon, 22 November, 2010 21:32:28
Subject: Re: LF: VLF G3XIZ - QRT

Hi Chris,

Sorry to hear that. Just checked to mails after beeing abscent the weekend=
 and=20
wanted to wish good luck too now but just read your mail below.
I assume the breakdown immediately de-tuned your system which reduced the=
 HV? So=20
the damage is limited to a few turns? Has it happened at the 0.2mm dia wir=
e?
BTW i am using 0.4mm dia wire, so not really much more...

Good luck in the next tests!

73, Stefan


Am 22.11.2010 22:15, schrieb Chris Osborn:=20
Thanks for looking Roger and chaps but game's over for tonight.
>
>I've insulation breakdown somewhere in the aerial circuit and I can't fix=
 it=20
>until daylight.
>
>Maybe try again next weekend.
>
>73 Chris G3XIZ
>
>
>
>
>
>
________________________________
From: Roger Lapthorn <rogerlapthorn@gmail.com>
>To: rsgb_lf_group@blacksheep.org; Chris Osborn <g3xiz@yahoo.co.uk>
>Sent: Mon, 22 November, 2010 20:49:24
>Subject: Re: LF: G3XIZ - no copy yet on 8.9719kHz
>
>Just swapped from the loop to the earth electrode - band noise stronger=
 - and=20
>there may be a hint of a signal on Chris's frequency.
>
>73s
>Roger G3XBM
>
>
>On 22 November 2010 20:21, Roger Lapthorn <rogerlapthorn@gmail.com> wrote=
:
>
>Have been looking for 20 minutes so far but nothing seen from Chris at ab=
out=20
>34km distance.
>>
>>Will continue to look for the next 2 hours.
>>
>>73s
>>Roger G3XBM
>>
>>--=20
>>http://g3xbm-qrp.blogspot.com/
>>http://www.g3xbm.co.uk
>>http://www.youtube.com/user/g3xbm
>>G3XBM=A0=A0 GQRP 1678=A0=A0=A0 ISWL G11088
>>
>
>
>--=20
>http://g3xbm-qrp.blogspot.com/
>http://www.g3xbm.co.uk
>http://www.youtube.com/user/g3xbm
>G3XBM=A0=A0 GQRP 1678=A0=A0=A0 ISWL G11088
>
>


     =20

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<html><head><style type=3D"text/css"><!-- DIV {margin:0px;} --></style></h=
ead><body><div style=3D"font-family:arial, helvetica, sans-serif;font-size=
:10pt"><DIV>Hello Stefan / LF,</DIV>
<DIV>&nbsp;</DIV>
<DIV>All was going last night well until I&nbsp;heard sparking from the ae=
rial distribution box each</DIV>
<DIV>time the carrier was turned off.</DIV>
<DIV>&nbsp;</DIV>
<DIV>After about 45 minutes the PA FET's blew up.</DIV>
<DIV>&nbsp;</DIV>
<DIV>I did some investigation and found that the output transformer has de=
veloped&nbsp;some</DIV>
<DIV>short-circuited turns and so is now useless.</DIV>
<DIV>&nbsp;</DIV>
<DIV>The loading coil seems unharmed so once I get a replacement transform=
er and connect&nbsp;in some </DIV>
<DIV>new FET's I'll be back in business.</DIV>
<DIV>&nbsp;</DIV>
<DIV>I'll&nbsp;slow down&nbsp;the rise and fall times of the pulse train=
 from the driver unit to the FET's and hopefully cure the sparking.</DIV>
<DIV>&nbsp;</DIV>
<DIV>(Mal) </DIV>
<DIV>Yes,&nbsp;N.O.V. holders&nbsp;must get prior permission before&nbsp;t=
hey transmit and must stay by the telephone for the duration.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Thanks to all those who looked for my signals.</DIV>
<DIV>&nbsp;</DIV>
<DIV>73 </DIV>
<DIV>Chris G3XIZ</DIV>
<DIV>&nbsp;</DIV>
<DIV><BR>&nbsp;</DIV>
<DIV style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial, helvetica, sans-serif">=
<BR>
<DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, tim=
es, serif"><FONT face=3DTahoma size=3D2>
<HR SIZE=3D1>
<B><SPAN style=3D"FONT-WEIGHT: bold">From:</SPAN></B> Stefan Sch=E4fer &lt=
;schaefer@iup.uni-heidelberg.de&gt;<BR><B><SPAN style=3D"FONT-WEIGHT: bold=
">To:</SPAN></B> rsgb_lf_group@blacksheep.org<BR><B><SPAN style=3D"FONT-WE=
IGHT: bold">Sent:</SPAN></B> Mon, 22 November, 2010 21:32:28<BR><B><SPAN=
 style=3D"FONT-WEIGHT: bold">Subject:</SPAN></B> Re: LF: VLF G3XIZ - QRT<B=
R></FONT><BR>Hi Chris,<BR><BR>Sorry to hear that. Just checked to mails af=
ter beeing abscent the weekend and wanted to wish good luck too now but ju=
st read your mail below.<BR>I assume the breakdown immediately de-tuned yo=
ur system which reduced the HV? So the damage is limited to a few turns?=
 Has it happened at the 0.2mm dia wire?<BR>BTW i am using 0.4mm dia wire,=
 so not really much more...<BR><BR>Good luck in the next tests!<BR><BR>73,=
 Stefan<BR><BR><BR>Am 22.11.2010 22:15, schrieb Chris Osborn:=20
<BLOCKQUOTE type=3D"cite">
<DIV style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial, helvetica, sans-serif">
<DIV>Thanks for looking Roger and chaps but game's over for tonight.<BR><B=
R>I've insulation breakdown somewhere in the aerial circuit and I can't fi=
x it until daylight.<BR><BR>Maybe try again next weekend.<BR><BR>73 Chris=
 G3XIZ<BR><BR><BR></DIV>
<DIV style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial, helvetica, sans-serif">=
<BR>
<DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, tim=
es, serif"><FONT face=3DTahoma size=3D2>
<HR SIZE=3D1>
<B><SPAN style=3D"FONT-WEIGHT: bold">From:</SPAN></B> Roger Lapthorn <A cl=
ass=3Dmoz-txt-link-rfc2396E href=3D"mailto:rogerlapthorn@gmail.com" target=
=3D_blank rel=3Dnofollow ymailto=3D"mailto:rogerlapthorn@gmail.com">&lt;ro=
gerlapthorn@gmail.com&gt;</A><BR><B><SPAN style=3D"FONT-WEIGHT: bold">To:<=
/SPAN></B> <A class=3Dmoz-txt-link-abbreviated href=3D"mailto:rsgb_lf_grou=
p@blacksheep.org" target=3D_blank rel=3Dnofollow ymailto=3D"mailto:rsgb_lf=
_group@blacksheep.org">rsgb_lf_group@blacksheep.org</A>; Chris Osborn <A=
 class=3Dmoz-txt-link-rfc2396E href=3D"mailto:g3xiz@yahoo.co.uk" target=3D=
_blank rel=3Dnofollow ymailto=3D"mailto:g3xiz@yahoo.co.uk">&lt;g3xiz@yahoo=
.co.uk&gt;</A><BR><B><SPAN style=3D"FONT-WEIGHT: bold">Sent:</SPAN></B> Mo=
n, 22 November, 2010 20:49:24<BR><B><SPAN style=3D"FONT-WEIGHT: bold">Subj=
ect:</SPAN></B> Re: LF: G3XIZ - no copy yet on 8.9719kHz<BR></FONT><BR>Jus=
t swapped from the loop to the earth electrode - band noise stronger - and=
 there <I>may</I> be a hint of a signal on
 Chris's frequency.<BR><BR>73s<BR>Roger G3XBM<BR><BR>
<DIV class=3Dgmail_quote>On 22 November 2010 20:21, Roger Lapthorn <SPAN=
 dir=3Dltr>&lt;<A href=3D"mailto:rogerlapthorn@gmail.com" target=3D_blank=
 rel=3Dnofollow ymailto=3D"mailto:rogerlapthorn@gmail.com">rogerlapthorn@g=
mail.com</A>&gt;</SPAN> wrote:<BR>
<BLOCKQUOTE class=3Dgmail_quote style=3D"PADDING-LEFT: 1ex; MARGIN: 0pt 0p=
t 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">Have been looking fo=
r 20 minutes so far but nothing seen from Chris at about 34km distance.<BR=
><BR>Will continue to look for the next 2 hours.<BR><BR>73s<BR>Roger G3XBM=
<BR clear=3Dall><FONT color=3D#888888><BR>-- <BR><A href=3D"http://g3xbm-q=
rp.blogspot.com/" target=3D_blank rel=3Dnofollow>http://g3xbm-qrp.blogspot=
.com/</A><BR><A href=3D"http://www.g3xbm.co.uk/" target=3D_blank rel=3Dnof=
ollow>http://www.g3xbm.co.uk</A><BR><A href=3D"http://www.youtube.com/user=
/g3xbm" target=3D_blank rel=3Dnofollow>http://www.youtube.com/user/g3xbm</=
A><BR>G3XBM&nbsp;&nbsp; GQRP 1678&nbsp;&nbsp;&nbsp; ISWL G11088<BR></FONT>=
</BLOCKQUOTE></DIV><BR><BR clear=3Dall><BR>-- <BR><A href=3D"http://g3xbm-=
qrp.blogspot.com/" target=3D_blank rel=3Dnofollow>http://g3xbm-qrp.blogspo=
t.com/</A><BR><A href=3D"http://www.g3xbm.co.uk/" target=3D_blank rel=3Dno=
follow>http://www.g3xbm.co.uk</A><BR><A   href=3D"http://www.youtube.com/u=
ser/g3xbm" target=3D_blank rel=3Dnofollow>http://www.youtube.com/user/g3xb=
m</A><BR>G3XBM&nbsp;&nbsp; GQRP 1678&nbsp;&nbsp;&nbsp; ISWL G11088<BR></DI=
V></DIV></DIV><BR></BLOCKQUOTE></DIV></DIV></div><br>



      </body></html>

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