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Message-ID: <598984.92253.qm@web28504.mail.ukl.yahoo.com>
Date: Sun, 17 Apr 2011 19:07:06 +0100 (BST)
From: Chris Osborn <g3xiz@yahoo.co.uk>
To: LF Group <rsgb_lf_group@blacksheep.org>
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Subject: LF: VLF - G3XIZ - Now QRT
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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 the week.

Balloon (and kite) launching from my home QTH is difficult and at times qu=
ite stressful.
I have to be ever vigilant that the balloons (or kite) don't hit local hou=
ses (TV / FM radio aerials) or come down in the adjacent playing field (ch=
ildren + EHT !)

I have a reasonable PA which if properly matched could give several hundre=
d 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 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 the matching transformer is already running over-voltage and would=
 doubtless break down.

It has been suggested that I use link coupling to the loading coil from th=
e PA but the one time I tried this caused damage to both the PA and the co=
il, so you 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 the balloons or kite assisted aerials.

I was considering taking apart an old PC PSU and using the output transfor=
mer 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=
 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 my VLF progress.

73
Chris G3XIZ



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<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0" ><tr><td valign=3D=
"top" style=3D"font: inherit;">LF,<br><br>I went QRT on VLF at about 17.00=
Z today.<br>Many thanks for all reports over the weekend and I shall give=
 a summary later in the week.<br><br>Balloon (and kite) launching from my=
 home QTH is difficult and at times quite stressful.<br>I have to be ever=
 vigilant that the balloons (or kite) don't hit local houses (TV / FM radi=
o aerials) or come down in the adjacent playing field (children + EHT !)<b=
r><br>I have a reasonable 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 voltage than its present 30V is not an option as the matching tr=
ansformer is already running over-voltage and would doubtless break down.<=
br><br>It has been
 suggested that I use link coupling to the loading coil from the PA but th=
e one time I tried this caused damage to both the PA and the coil, so you=
 will sympathise with my reluctance to try that again!<br><br>I will conti=
nue for a few weeks and see if I manage to get 'real' success with the bal=
loons or kite assisted aerials.<br><br>I was considering taking apart an=
 old PC PSU and using the output transformer from that instead on my prese=
nt iron-laminated mains transformer.<br>I believe that PC types will be mo=
re suitable and handle higher voltages.<br><br>I plan to transmit over the=
 Easter holiday but beyond that I am uncertain.<br>I have a plan to try /P=
 during the summer but this depends on gaining the permission of the land=
 owner, which I am waiting for at present.<br><br>I am getting consistent=
 reports from my 'regulars' but now need a step change in my VLF progress.=
<br><br>73<br>Chris G3XIZ<br><br><br><br></td></tr></table>

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