An:
[email protected]
Betreff: Re: VLF: DK7FC's 6th VLF kite experiment
>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 Stöcker 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 settings - or someone has a quick hint.
>> QRM/QRN is relatively low this morning. Possibly to high, but I will igve it a try.
>> I am receiving with my T-Antenna and a my new hombrew preamp and soundcard.
>> Stefan, good luck - and to all the thousands of listeners, hi.
>> vy73 Horst DO1KHS/DI2AN
>>
>>
>> -----Ursprüngliche Nachricht-----
>> Von: mal hamilton <
[email protected]>
>> Gesendet: 31.07.2010 17:35:20
>> An:
[email protected]
>> Betreff: Re: VLF: DK7FC's 6th VLF kite experiment
>>
>>
>>> 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"
>>> 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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>>
>>
>
>
