Mal,
Grow up and stop seeking attention like a two year old child throwing toys out of the pram. Your positive contributions are appreciated. Your jibes only make you sound a total idiot.
73s
Roger G3XBM
On 31 July 2010 20:07, mal hamilton <[email protected]> wrote:
Some live in a make believe world of Visions,
Miracles and Impossibilities, others live in the Real world
g3kev
----- Original Message -----
Sent: Saturday, July 31, 2010 7:49
PM
Subject: RE: VLF: DK7FC's 6th VLF kite
experiment
Hi
Mal
Do you have to
practice at being such a funsucker or did it come
naturally??
73s
Jim
G7NKS
This is even a bigger waste of
time than 9 kcs. I doubt if anyone has the capability to receive on this
frequency, when the majority cannot hear anything on 137
kcs
----- Original Message -----
Sent:
Saturday, July 31, 2010 7:22 PM
Subject: Re:
VLF: DK7FC's 6th VLF kite experiment
Mal, LF,
I will be watching for Stefan on 6.6kHz +/- 200Hz
(not 8.97kHz as you keep stating) as you may have read in his mails. I will
be using a loop & pre-amp as designed by Jim
M0BMU.
Battery is
now fully charged & system ready to go.
On 31 July 2010 16:35, mal hamilton <[email protected]>
wrote:
Stefan
Who has a RX setup that will be able to
look for your signal, I seem to be
the only one so far. There is a trace
on 8.97 at present but noone else can
see it.
There is very little
response via this reflector and vy little acty at
present on 137 and
500.
de mal/g3kev
----- Original Message
-----
From: "Stefan Schäfer" <[email protected]>
To:
<[email protected]>
Sent:
Saturday, July 31, 2010 10:53 AM
Subject: Re: VLF: DK7FC's 6th VLF kite
experiment
> Hello Peter,
>
>
Better say 6,6 +-200 Hz. It is still not certain where the resonance
>
will be, sorry. There are to many assumtions, estimations
and
calculations.
>
> On 137 kHz the measured C for 100m is
580pF (measured with a RC bridge
> and by measuring the L and
calculating C). But EZNEC shows a lower C.
> This could be, since a
100m vertical is not absolutely short against
> Lambda and so the sems
to occur some impedance transformation which
> "looks/behaves" like a
higherC.
>
> On <9 kHz the 100m wire IS short against lambda
and so i loose this
> benefit. There, the actual C is present. The L
of my variometer part in
> the BIG coil is estimated to be 30 mH.
Maybe it is even more and the
> overall L is higher than
L(coil)+L(variometer) due to the better
> magnetic coupling. So maybe
i have less C and more L than thought on 8,97.
>
> When doubling
the antenna height from 100m to 200m and assuming 5 pF/m
> the C is
doubled as well. So i thought i will come out at 6,34 kHz
>
(8,97/sqrt(2)). But this may just a rough estimate. EZNEC says the C
>
factor is not 2 but 1,88 so i would come out some 100 Hz
above.
>
> So the question is:
> What is the actual
antenna C for 100m
> What is the actual (maximum and average)
L
> What is the C factor when going from 100m to 200m
>
>
This are many uncertainties and so i didn't want to tap the coil at
70%
> of the winding to come back to 8,97 kHz but first just to
measure out
> where the resonance will be, to solve these open
Questions. Of course,
> another important and very interesting issue
is propagation in the 46km
> band! :-)
>
> So, sorry for
that coarse frequency range. Maybe the actual QRG will be
> written
here in the reflector and can be seen on my garbber2 but first
> lets
hope for proper WX!
>
> 73 and tnx,
Stefan/DK7FC
>
>
>
> Am 31.07.2010 11:23, schrieb
pws:
> > Hi Stefan,
> >
> > Question: do you have
a realistic guess of the frequency window of your
> > transmission
around 6.5kHz, e.g. +-100Hz?
> >
> > You wrote:
>
>
> >> ....
> >> on *Sunday, the 1. August*, i
will make a new kite experiment.
> >> ...
> >> i
will transmit at arround *6,5 kHz,
> >> ...
> >>
Starting time is* 8 UTC*, maybe some time later
> >> ...
>
>> TX QTH is as usual in JN49IS, 49.77647N 8.699525.
>
>>
> > Distance is 516km, heading 10deg. to Kiel.
>
>
> > Just modified the software running at ~17mHz of
resolution. Antennas are
> > two crossed ferrite loops feeding some
BC550 in parallel buffered by
> > NE5532. Both amplifiers are
connected to a M-Audio Audiophile 192
running
> > at 24 kHz on
an Intel Atom 330 "shoe-box" under Linux.
> >
> > 73 from
Baltic Sea,
> > Peter
>
>
>
--
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G3XBM GQRP 1678 ISWL G11088
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