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Date: Mon, 03 Sep 2018 21:14:02 +0200
From: DK7FC <selberdenken@posteo.de>
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Subject: Re: ULF: Carrier on 2970.005 Hz
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Hello Genosse Roman,

Yes, i used the ground loop also on 2970 Hz (and on 2470 Hz and 1970 
Hz). On sunday i also run a 2 hour long carrier on 1570 Hz starting 
08:08 UTC. The post-processing is running. I will report later. Next i 
will try 970 Hz but also 137 kHz!

73, GL, Stefan


Am 03.09.2018 20:45, schrieb Roman:
> Congrats Stefan!
>
> Impressed by your DFCW TX a\t 8 kHz.
> Do you use a ground ant at 2970 also too?
>
> 73
> Roman
>
>    
>> Here is a spectrogram showing the 2970 Hz signal in 3.8 mHz as received
>> on the tree. The carrier reached an S/N of 27.57 dB in 166.7 uHz, -10.22
>> dB in 1Hz, -44.20 dB in 2.5kHz
>>
>> 73, Stefan
>>
>> Am 01.09.2018 21:33, schrieb DK7FC:
>>
>>      
>>> Hi Markus and Paul,
>>>
>>> Thanks for the efforts to watch out for the signal. I'm surprised that
>>> the signal appears at Bielefeld since the 900m ground loop antenna in
>>> JN39WI does not really point there, it rather points directly to Paul.
>>> No trace in Todmorden? The gain of the loop is on your side! :-)
>>>
>>> Markus, can you decode a '*' message from the exportet FFT data? 8 dB
>>> in 167 uHz could be fine.
>>>
>>> It was an interesting test of the new equipment. After the 100 minutes
>>> at 265 W power consumption from the battery, the display still shows
>>> 70 % rest capacity for the next experiment which will follow soon. The
>>> H bridge PA stays cool during the transmission. The PA can work from
>>> 30 Hz to 9 kHz. I could add another 3 dB by running more power. Since
>>> i have to 'wait' during the transmission i can't run a 24 hour
>>> transmission :-) It will always be less than 2 hours but i can run
>>> more power so we can search for the signal in a higher bandwidth which
>>> could be an advantage.
>>>
>>> 73, Stefan
>>>
>>> Am 01.09.2018 20:33, schrieb Paul Nicholson:
>>>
>>>        
>>>> After cycling through some combinations of filter and
>>>> blanker settings, Bielefeld (DL4YHF) is now showing
>>>>
>>>> http://abelian.org/vlf/tmp/180901b.gif
>>>>
>>>> About 3.8 sigma, needs another couple of dB.
>>>>
>>>> --
>>>> Paul Nicholson
>>>> --
>>>>