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Date: Sun, 10 Jul 2016 15:55:33 +0200
From: DK7FC <selberdenken@posteo.de>
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Subject: Re: ULF: Key down signal on the 101 km band, still on the air
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Status: O

Hi all,

It's a deep summer hole this year it seems :-)

Well, i've stared a 4.1 uHz per FFT bin spectrogram in SpecLab. Probably 
the slowest spectrogram in SL ever? ;-)
It took about 3 days until the first pixel/spectrum appeared. The scroll 
rate is 1000 minutes / pixel. Time stamps are "MMM" :-)

Look at the spectrum peak of the signal, it's right on the frequency and 
quite sharp, proofing a good stability of RX, TX and path....

The signal is on the air now since 2 weeks!

73 all, Stefan

PS: +33 C here...


Am 08.07.2016 14:16, schrieb DK7FC:
> Hi Paul, ULF,
>
> I just remember these curves, see attachent.
>
> Even on our path, the 101 km band seems to be not the easiest place to 
> be :-) There could be a 20 dB disadvantage even on our short path. It 
> doesn't matter, i will simply transmit 100 times as long :-)
> Once you got my peak, you can easier optimise the settings and we can 
> do calculations and estimations...
>
> I have completed the first stack (1 of 8) of my new coil intedned to 
> generate 40 kV at 2.97 kHz. It has 350 mH, the loss is 107 Ohm at 2970 
> Hz. It can handle 350 mA antenna current without problems. For a HV 
> test i need the PA which is in use now :-)
> Images:https://dl.dropboxusercontent.com/u/19882028/ULF/20160708_140755.jpg 
> and https://dl.dropboxusercontent.com/u/19882028/ULF/20160708_140728.jpg
>
> 73, Stefan
>
>
>
> Am 06.07.2016 08:48, schrieb Paul Nicholson:
>>
>> Stefan wrote:
>>
>> > The carrier is on the air since 9 days now, without
>> > an interruption.
>>
>> Nothing is visible, not even the beginning of a peak at 2970,
>> down to bandwidths of 1.36 uHz.
>>
>> I continue to experiment with the settings of filters and
>> sferic blanker. The noise floor is too high, averaging
>> 0.023 fT in 1.36 uHz even after blanking the noisy periods.
>> It should be a lot lower than that.  If I can fix that problem,
>> we may see the signal appear.
>>
>> -- 
>> Paul Nicholson
>> -- 
>>