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Message-ID: <274065.37961.qm@web28101.mail.ukl.yahoo.com>
References: <598984.92253.qm@web28504.mail.ukl.yahoo.com>
Date: Sun, 17 Apr 2011 20:33:37 +0100 (BST)
From: M0FMT <m0fmt@yahoo.co.uk>
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <598984.92253.qm@web28504.mail.ukl.yahoo.com>
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Subject: Re: LF: VLF - G3XIZ - Now QRT
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Hi Chris and LF

A big thank you to you Chris for all the work you have put into this exerc=
ise.=20
Hope the results to date have been worth it. I guessed you had gone off bu=
t you=20
were into the noise with me by then. The noise really comes up on VLF at=
 night=20
around here.
=A073 es GL Pete M0FMT IO91UX=20




________________________________
From: Chris Osborn <g3xiz@yahoo.co.uk>
To: LF Group <rsgb_lf_group@blacksheep.org>
Sent: Sun, 17 April, 2011 19:07:06
Subject: LF: VLF - G3XIZ - Now QRT


LF,

I went QRT on VLF at about 17.00Z today.
Many thanks for all reports over the weekend and I shall give a summary la=
ter in=20
the week.

Balloon (and kite) launching from my home QTH is difficult and at times qu=
ite=20
stressful.
I have to be ever vigilant that the balloons (or kite) don't hit local hou=
ses=20
(TV / FM radio aerials) or come down in the adjacent playing field (childr=
en +=20
EHT !)

I have a reasonable PA which if properly matched could give several hundre=
d=20
watts of RF.
At present I get at best about 140 watts.
I am still using the mains matching transformer between the PA and the loa=
ding=20
coil and this has a step-up ratio of 1:24

Energizing the PA with a higher voltage than its present 30V is not an opt=
ion as=20
the matching transformer is already running over-voltage and would doubtle=
ss=20
break down.

It has been suggested that I use link coupling to the loading coil from th=
e PA=20
but the one time I tried this caused damage to both the PA and the coil,=
 so you=20
will sympathise with my reluctance to try that again!

I will continue for a few weeks and see if I manage to get 'real' success=
 with=20
the balloons or kite assisted aerials.

I was considering taking apart an old PC PSU and using the output transfor=
mer=20
from that instead on my present iron-laminated mains transformer.
I believe that PC types will be more suitable and handle higher voltages.

I plan to transmit over the Easter holiday but beyond that I am uncertain.
I have a plan to try /P during the summer but this depends on gaining the=
=20
permission of the land owner, which I am waiting for at present.

I am getting consistent reports from my 'regulars' but now need a step cha=
nge in=20
my VLF progress.

73
Chris G3XIZ

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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></DIV>
<DIV>Hi Chris and LF</DIV>
<DIV>&nbsp;</DIV>
<DIV>A big thank you to you Chris for all the work you have put into this=
 exercise. Hope the results to date have been worth it. I guessed you had=
 gone off but you were into the noise with me by then. The noise really co=
mes up on VLF at night around here.<BR>&nbsp;</DIV>73 es GL Pete M0FMT IO9=
1UX=20
<DIV><BR></DIV>
<DIV style=3D"FONT-FAMILY: arial, helvetica, sans-serif; FONT-SIZE: 10pt">=
<BR>
<DIV style=3D"FONT-FAMILY: times new roman, new york, times, serif; FONT-S=
IZE: 12pt"><FONT size=3D2 face=3DTahoma>
<HR SIZE=3D1>
<B><SPAN style=3D"FONT-WEIGHT: bold">From:</SPAN></B> Chris Osborn &lt;g3x=
iz@yahoo.co.uk&gt;<BR><B><SPAN style=3D"FONT-WEIGHT: bold">To:</SPAN></B>=
 LF Group &lt;rsgb_lf_group@blacksheep.org&gt;<BR><B><SPAN style=3D"FONT-W=
EIGHT: bold">Sent:</SPAN></B> Sun, 17 April, 2011 19:07:06<BR><B><SPAN sty=
le=3D"FONT-WEIGHT: bold">Subject:</SPAN></B> LF: VLF - G3XIZ - Now QRT<BR>=
</FONT><BR>
<TABLE border=3D0 cellSpacing=3D0 cellPadding=3D0>
<TBODY>
<TR>
<TD vAlign=3Dtop>LF,<BR><BR>I went QRT on VLF at about 17.00Z today.<BR>Ma=
ny thanks for all reports over the weekend and I shall give a summary late=
r in the week.<BR><BR>Balloon (and kite) launching from my home QTH is dif=
ficult and at times quite stressful.<BR>I have to be ever vigilant that th=
e balloons (or kite) don't hit local houses (TV / FM radio aerials) or com=
e down in the adjacent playing field (children + EHT !)<BR><BR>I have a re=
asonable PA which if properly matched could give several hundred watts of=
 RF.<BR>At present I get at best about 140 watts.<BR>I am still using the=
 mains matching transformer between the PA and the loading coil and this=
 has a step-up ratio of 1:24<BR><BR>Energizing the PA with a higher voltag=
e than its present 30V is not an option as the matching transformer is alr=
eady running over-voltage and would doubtless break down.<BR><BR>It has be=
en suggested that I use link coupling to the loading coil from the PA but=
 the one time
 I tried this caused damage to both the PA and the coil, so you will sympa=
thise with my reluctance to try that again!<BR><BR>I will continue for a=
 few weeks and see if I manage to get 'real' success with the balloons or=
 kite assisted aerials.<BR><BR>I was considering taking apart an old PC PS=
U and using the output transformer from that instead on my present iron-la=
minated mains transformer.<BR>I believe that PC types will be more suitabl=
e and handle higher voltages.<BR><BR>I plan to transmit over the Easter ho=
liday but beyond that I am uncertain.<BR>I have a plan to try /P during th=
e summer but this depends on gaining the permission of the land owner, whi=
ch I am waiting for at present.<BR><BR>I am getting consistent reports fro=
m my 'regulars' but now need a step change in my VLF progress.<BR><BR>73<B=
R>Chris G3XIZ<BR><BR><BR><BR></TD></TR></TBODY></TABLE></DIV></DIV></div><=
/body></html>

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