Message-ID: <4D283C59.6080303@iup.uni-heidelberg.de>
Date: Sat, 08 Jan 2011 11:28:41 +0100
From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= <schaefer@iup.uni-heidelberg.de>
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References: <4D25EC9A.6030201@iup.uni-heidelberg.de> <55F29B964A0142EE93CCD0BCFD084EDF@JimPC> <4D27796E.8020107@iup.uni-heidelberg.de>
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Subject: Re: LF: DK7FC 137 kHz kite activity, 8. Jan.
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LF,

I'll begin now starting the experiment. QRV in 3...4 hours...

73, Stefan/DK7FC

Am 07.01.2011 21:37, schrieb Stefan Sch=E4fer:
> Daer LF group,
>
> Due to the WX forecast i decided to start my activity tomorrow. It=20
> will be just on LF, no VLF activity this time. Perhaps the wind is too=
=20
> strong so i can only use the 100m kite with its 500 kp strong braid.=20
> The 300m kite has a 280 kp braid which might be to weak but maybe i'm =
=20
> crazy enough to use it anyway. The *300m kite* is allowed to be used=20
> only in daylight. So, in the night i have to go down to 100m anyway.
>
> Apart from doing *QSOs* (hopefully) my goals are reaching the *4X1RF*=20
> grabber in DFCW-3 and the *JA7NI* grabber in DFCW-60 or 90.=20
> Furthermore i remember an almost-QSO with *Ed / RU6LA.* Would be nice=20
> if this could be completed. I'll start in the afternoon, maybe 11 UTC,=
=20
> without to much stress. But i plan to stay long, so hopefully a=20
> contact to USA and maybe even Argentinia could be possible? Maybe even=
=20
> a trace at VE7TIL? LF-Dreaming!!!
> BTW i am interested in local QSOs as well, not only DX is of interest!!
>
> Since my LF converter isn't finished i have to use the DDS VFO for LF=20
> which is slightly drifting in a QRSS-60 window but i'll be in contact=20
> with DF6NM who can tell me the drift and offset ;-)
>
> If all works well, my CW QRG will be 136.8 kHz, DFCW-3 137.7 kHz and=20
> DFCW-60/90 136.177 kHz(+- 3 Hz). My receivers are the 706, the K2=20
> (with a GW4ALG 30m-converter) and the new /p RX that is under test...=20
> During transmitting DFCW-3 i will receive in DFCW-3 and 10.
>
> My /p RX is still not optimised but at least i got a QSO with RA3YO in=
=20
> DFCW3/8 last year and a CW contact to M0BMU and G3KEV. I'll have my CW=
=20
> key there and hope for some nice contacts!
>
> Any reports are much appreciated! :-)
>
> Best 73, Stefan/DK7FC
>
> Am 06.01.2011 22:33, schrieb James Moritz:
>> Dear Stefan, LF Group,
>>
>>> _Questions:_ Is my calculation reasonably useful? Would YOU add that
>>> coil in a height of 100m above GND?
>>
>> I have found with NEC simulations that they give you a reasonable=20
>> idea of the impedance, but not a precise value. Especially for the=20
>> resistance, where there are many unknowns - NEC really only sets a=20
>> lower limit.
>>
>> On the basis of the calculations, I would first try without the coil,=
=20
>> then if results are as expected, I would try it with the coil.=20
>> Otherwise there are too many variables to make sense of the=20
>> experiment - if the coil goes up and the impedance is totally=20
>> different from the calculation, is it because of the coil, the=20
>> antenna, or the calculation?
>>
>>>
>>> I tend to let it be since the improvement isn't that much and the=20
>>> effort
>>> is high. Furthermore the coil losses could be higher since i have to=
=20
>>> use
>>> a thin wire to keep the weight small...
>>
>> Yes - the 136k coils I have made with Q > 300 have been rather big,=20
>> either with RF Litz wire or thick solid wire.
>>
>> Hope to see some signals at the weekend,
>>
>> Cheers, Jim Moritz
>> 73 de M0BMU
>>
>>

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LF, <br>
<br>
I'll begin now starting the experiment. QRV in 3...4 hours...<br>
<br>
73, Stefan/DK7FC<br>
<br>
Am 07.01.2011 21:37, schrieb Stefan Sch=E4fer:
<blockquote cite=3D"mid:4D27796E.8020107@iup.uni-heidelberg.de"   type=3D"=
cite">
  <meta content=3D"text/html; charset=3DISO-8859-15"   http-equiv=3D"Conte=
nt-Type">
Daer LF group, <br>
  <br>
Due to the WX forecast i decided to start my activity tomorrow. It will
be just on LF, no VLF activity this time. Perhaps the wind is too
strong so i can only use the 100m kite with its 500 kp strong braid.
The 300m kite has a 280 kp braid which might be to weak but maybe i'm=A0
crazy enough to use it anyway. The <b>300m kite</b> is allowed to be
used only in daylight. So, in the night i have to go down to 100m
anyway.<br>
  <br>
Apart from doing <b>QSOs</b> (hopefully) my goals are reaching the <b>4X1R=
F</b>
grabber in DFCW-3 and the <b>JA7NI</b> grabber in DFCW-60 or 90.
Furthermore i remember an almost-QSO with <b>Ed / RU6LA.</b> Would be
nice if this could be completed. I'll start in the afternoon, maybe 11
UTC, without to much stress. But i plan to stay long, so hopefully a
contact to USA and maybe even Argentinia could be possible? Maybe even
a trace at VE7TIL? LF-Dreaming!!!<br>
BTW i am interested in local QSOs as well, not only DX is of interest!!<br=
>
  <br>
Since my LF converter isn't finished i have to use the DDS VFO for LF
which is slightly drifting in a QRSS-60 window but i'll be in contact
with DF6NM who can tell me the drift and offset ;-)<br>
  <br>
If all works well, my CW QRG will be 136.8 kHz, DFCW-3 137.7 kHz and
DFCW-60/90 136.177 kHz(+- 3 Hz). My receivers are the 706, the K2 (with
a GW4ALG 30m-converter) and the new /p RX that is under test... During
transmitting DFCW-3 i will receive in DFCW-3 and 10.<br>
  <br>
My /p RX is still not optimised but at least i got a QSO with RA3YO in
DFCW3/8 last year and a CW contact to M0BMU and G3KEV. I'll have my CW
key there and hope for some nice contacts! <br>
  <br>
Any reports are much appreciated! :-)<br>
  <br>
Best 73, Stefan/DK7FC<br>
  <br>
Am 06.01.2011 22:33, schrieb James Moritz:
  <blockquote cite=3D"mid:55F29B964A0142EE93CCD0BCFD084EDF@JimPC"   type=
=3D"cite">Dear Stefan, LF Group, <br>
    <br>
    <blockquote type=3D"cite">_Questions:_ Is my calculation reasonably
useful? Would YOU add that <br>
coil in a height of 100m above GND? <br>
    </blockquote>
    <br>
I have found with NEC simulations that they give you a reasonable idea
of the impedance, but not a precise value. Especially for the
resistance, where there are many unknowns - NEC really only sets a
lower limit. <br>
    <br>
On the basis of the calculations, I would first try without the coil,
then if results are as expected, I would try it with the coil.
Otherwise there are too many variables to make sense of the experiment
- if the coil goes up and the impedance is totally different from the
calculation, is it because of the coil, the antenna, or the
calculation? <br>
    <br>
    <blockquote type=3D"cite"><br>
I tend to let it be since the improvement isn't that much and the
effort <br>
is high. Furthermore the coil losses could be higher since i have to
use <br>
a thin wire to keep the weight small... <br>
    </blockquote>
    <br>
Yes - the 136k coils I have made with Q &gt; 300 have been rather big,
either with RF Litz wire or thick solid wire. <br>
    <br>
Hope to see some signals at the weekend, <br>
    <br>
Cheers, Jim Moritz <br>
73 de M0BMU <br>
    <br>
    <br>
  </blockquote>
</blockquote>
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