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Date: Sun, 01 Aug 2010 09:56:36 +0200
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Subject: Re: VLF: DK7FC's 6th VLF kite experiment
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Horst,
You need to change the frequency of the "1st mixer" :
Options.. FFT Settings ... Center Frequency [Hz] .
This reprograms the software NCO, and thus the displayable frequency range=
.

Cheers,
  Wolf .

Horst St=C3=B6cker schrieb:
> Hello all,
> I have the same question. The 9khz_4mHz.usr can not be set to 6kHz just=
 by changing the frequency range or the center frequency. I am sure it's=
 a simple trick, but I could not find out. So I will have to use other set=
tings - or someone has a quick hint.
> QRM/QRN is relatively low this morning. Possibly to high, but I will igv=
e it a try.
> I am receiving with my T-Antenna and a my new hombrew preamp and soundca=
rd.
> Stefan, good luck - and to all the thousands of listeners, hi.
> vy73 Horst DO1KHS/DI2AN
>
>
> -----Urspr=C3=BCngliche Nachricht-----
> Von: mal hamilton <g3kevmal@talktalk.net>
> Gesendet: 31.07.2010 17:35:20
> An: rsgb_lf_group@blacksheep.org
> Betreff: Re: VLF: DK7FC's 6th VLF kite experiment
>
>  =20
>> 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 Sch=C3=A4fer"=20
>> To: <rsgb_lf_group@blacksheep.org>
>> Sent: Saturday, July 31, 2010 10:53 AM
>> Subject: Re: VLF: DK7FC's 6th VLF kite experiment
>>
>>
>>    =20
>>> 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
>>>      =20
>> calculations.
>>    =20
>>> 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 46k=
m
>>> 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:
>>>      =20
>>>> Hi Stefan,
>>>>
>>>> Question: do you have a realistic guess of the frequency window of yo=
ur
>>>> transmission around 6.5kHz, e.g. +-100Hz?
>>>>
>>>> You wrote:
>>>>
>>>>        =20
>>>>> ....
>>>>> 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.
>>>>>
>>>>>          =20
>>>> 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
>>>>        =20
>> running
>>    =20
>>>> at 24 kHz on an Intel Atom 330 "shoe-box" under Linux.
>>>>
>>>> 73 from Baltic Sea,
>>>> Peter
>>>>
>>>>        =20
>>    =20
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>  =20