Re: ULF: Key down signal on the 101 km band, still on the air

[Markus Vester <markusvester@aol.com>]

Excellent result... And now you got 40 dB SNR, scaling nicely with integration time and inverse bandwidth. This shows how GPS locking both transmitter and receiver can achieve timing as accurate as a gear drive!

Best 73,
Markus (DF6NM)
 


-----Ursprüngliche Mitteilung-----
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: So, 10 Jul 2016 3:58 pm
Betreff: Re: ULF: Key down signal on the 101 km band, still on the air

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
>> --
>>