Message-ID: <4D27796E.8020107@iup.uni-heidelberg.de>
Date: Fri, 07 Jan 2011 21:37:02 +0100
From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= <schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
CC: Marcelo - LW2ETU <lw2etu@yahoo.com.ar>,
        Alejandro D Alvarez LU8YD <alex2003@infovia.com.ar>,
        Yas Aonuma <ja8scd@kt.rim.or.jp>,
        Bernd Grupe <bernd.grupe@t-online.de>, Ed Lesnichy <ru6la@bk.ru>
References: <4D25EC9A.6030201@iup.uni-heidelberg.de> <55F29B964A0142EE93CCD0BCFD084EDF@JimPC>
In-Reply-To: <55F29B964A0142EE93CCD0BCFD084EDF@JimPC>
Subject: LF: DK7FC 137 kHz kite activity, 8. Jan.
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Daer LF group,

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  crazy 
enough to use it anyway. The *300m kite* is allowed to be used 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* 
grabber in DFCW-3 and the *JA7NI* grabber in DFCW-60 or 90. Furthermore 
i remember an almost-QSO with *Ed / RU6LA.* 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!!!
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 
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 ;-)

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.

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!

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 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.
>
> 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?
>
>>
>> I tend to let it be since the improvement isn't that much and the effort
>> is high. Furthermore the coil losses could be higher since i have to use
>> a thin wire to keep the weight small...
>
> Yes - the 136k coils I have made with Q > 300 have been rather big, 
> 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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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>
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