Message-ID: <58920FFF.9050405@posteo.de>
Date: Wed, 01 Feb 2017 17:42:39 +0100
From: DK7FC <selberdenken@posteo.de>
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In-Reply-To: <58911DBF.2080706@posteo.de>
Subject: Re: ULF: Transmission announcement for 2970 Hz
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Status: RO

...transmission still running. The ex forecast shows a slight rain in an 
hour. I disabled the ALC and set the safety limit to 10 mA. If the coil 
becomes wet, the resonance will drop, the antenna current will drop. 
After 3 seconds below 140 mA the carrier will stop. But maybe i am lucky 
and the rain will not set in here...

73, Stefan

Am 01.02.2017 00:29, schrieb DK7FC:
> Hi ULF,
>
> Since 23:25 UTC i'm running 150 mA antenna current again on 
> 2970.000000 Hz.
>
> If the wx permits, i'll run it for 24 hours or so...
>
> 73, Stefan
>
> Am 30.01.2017 15:08, schrieb DK7FC:
>> Hi Paul, ULF,
>>
>> Am 29.01.2017 18:26, schrieb Paul Nicholson:
>>>
>>> Stefan wrote:
>>>
>>> > From the known decoded EbNaut messages, what was the SNR at
>>> > Renato or on your side?
>>>
>>> Nothing detectable here or at Cumiana so I can't answer the
>>> question of how many days need stacking.  Until there is some
>>> glimpse of a signal, it is completely unknown.  I can only
>>> estimate a lower limit.
>> Yes, we don't even know if the night could be better than the day.
>>
>>> Between 2016-06-26 13:00 and 2016-07-31 08:00 you transmitted
>>> carrier with 30mA antenna current.  I received and stacked
>>> over 34 days of carrier (about 15dB stacking gain) with no
>>> sign of signal.  You estimated 100nW ERP.
>>>
>>> Now you can do 150mA current - about 14dB gain over July's
>>> signal.  Plus, improvements here to filtering and blanking
>>> may add 2 or 3dB more.
>> Plus the lower QRN!
>>
>>> We can in two days exceed the stacked signal for the whole
>>> of July.  Also with your higher ERP I can see the signal each
>>> day at Bielefeld to check the phase.
>> Yes, Wolf's RX is a nice feedback channel for the daily tests.
>>> I think we should try some daytime carrier repeats.  Already we
>>> know there is nothing after 2 days so we will need at least
>>> 4 days to get a hint of signal and then at least 10 days to
>>> collect enough signal for some measurements.  It is surely
>>> certain that we will eventually pick up the signal after
>>> enough days.
>> Yes, more adding is the only way to find out what happens between QRB 
>> of  3 and 5 lambda, and 8.8 lambda!
>>
>> I assume you have saved the data from Cumiana to add the signals that 
>> i transmitted so far at 150 mA?
>> That was:
>> Jan, 20th, 8...20:00 UTC 2970.000 Hz
>> Jan, 21th, 8...17:00 UTC 2970.000 Hz + 17...20 UTC 269.9975 Hz
>> Jan, 22th, 8...14:45:20 UTC 2970.000 Hz, reconstructed carrier of 
>> EbNaut (8K19A, CRC16, 7ch, 40s, message: 'F/DK7FC')
>> Jan, 24th, 8... 16:00 UTC 2970.000 Hz, reconstructed carrier of 
>> EbNaut (16K25A, CRC18, 3ch, 30s, message 'ULF')
>> Jan, 25th, 7... 16:20 UTC, 2970.000 Hz, reconstructed carrier of 
>> EbNaut (16K25A, CRC16, 5ch, 30s, message 'DK7FC')
>>
>> That's already 42 hours in daylight (8...17 UTC), a peak shown in 6.6 
>> uHz. And there is nothing at all?
>> Can we assume that Renato's RX has the full sensitivity on 2970 Hz? 
>> The sferics always appear very strong. I clearly expected to see 
>> Markus on 8270 Hz in JN38OO, even with my resonated antenna, because 
>> the sferics still looked so strong. But there was not a trace at all! 
>> It is hard to imagine that Wolf can decode the messages 'easily' and 
>> Renato can't seea faint peak. But maybe, that's how it is. I should 
>> do a holiday weekend again, in 4 lambda distance...
>>
>> If the wx permits, i will run a carrier tomorrow on 2970.000 Hz 
>> between 8...17 UTC.
>>
>> 73, Stefan
>>
>>
>