Message-ID: <5D14D734.3030602@posteo.de>
Date: Thu, 27 Jun 2019 16:48:20 +0200
From: DK7FC <selberdenken@posteo.de>
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To: rsgb_lf_group@blacksheep.org
References: <16b9872d87c.marcocadeddu@tin.it>
In-Reply-To: <16b9872d87c.marcocadeddu@tin.it>
Subject: Re: R: Re: ULF/VLF: amateur stair case / carrier transmissions
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Hi Marco,

Yes you are right.
But maybe this is a sign! Someone should buy one and start 
experimenting, then it would be a funny start of the story.
Will you? ;-)
I'm busy with my wires on the ground...

BTW there was an unannounced transmission of SAQ today. I'm right now 
producing a wav file from the N-S loop (heavy QRN from the east today) 
to listen for it...

73, Stefan


Am 27.06.2019 12:19, schrieb marcocadeddu@tin.it:
> ehm... Roman
> Stefan just mistyped drone instead of done ;-)
> 73 Marco IK1HSS
>
> ----Messaggio originale----
> Da: rw3adb@YANDEX.ru
> Data: 27-giu-2019 11.50
> A: <rsgb_lf_group@blacksheep.org>
> Ogg: Re: ULF/VLF: amateur stair case / carrier transmissions
>
> Gut Abend Genosse Funkamateur Stefan!
>
> Do not understood exactly - whats model of drone? Quadrocopter?
> 20 min so little time, of course.
> We are discuss about transmit power for copter by wires from the 
> ground, not batteries.
>
> 73!
> Roman
>
> > Hello Genosse Funkamateur Roman,
> >
> > I'm sorry, the 'drone' was just a typo. I simply meant 'done' instead.
> >
> > 73,Stefan
> >
> > Am 26.06.2019 10:58, schrieb Roman:
> >
> >> Guten morgen Genosse Funkamateur Stefan!
> >>
> >> Congrats with your success!
> >>
> >> Let us to know more details about drone antenna?
> >> We are discuss about that way in 2011 on 136.su forum.
> >> Very interesting!
> >>
> >> 73!
> >> Roman
> >>
> >>> Hi all,
> >>>
> >>> Today, some 20 minute long carrier transmissions were drone from 
> JN39WI
> >>> again. The main intention was to calibrate my local RDF spectrogram
> >>> (still to be done) in the range below 16.4 kHz (JXN) and above 82 Hz
> >>> (ZEVS). So that was a amateur radio ULF/VLF staircase somehow, despite
> >>> the weak signal strength relative to commercial transmitters.
> >>>
> >>> It was a hot day! Far> 30 C here. I started early in the morning and
> >>> enjoyed the fresh air in the forest.
> >>>
> >>> The DC resistance of the 1130m ground loop increased to 73.2 Ohm
> >>> (measured at 1 A) due to the dry soil. It confirms the dependency 
> shown
> >>> in the last year! In 2018 i saw the resistance rising up to 94 Ohm in
> >>> late October, then it dropped to 57 Ohm (-40 %) in just 2 months.
> >>>
> >>> It was interesting to see that the antenna current is much higher at
> >>> lower frequencies (always at resonance | the PA output voltage is 
> nearly
> >>> constant). This effect was very clearly expressed.
> >>>
> >>> IF of interest for other stations (having a data storage):
> >>>
> >>> Frequency/Hz Start time/UTC Antenna current/A
> >>> 970.005 2019-06-25_08:36:20,+20m 2.26
> >>> 2970.005 2019-06-25_08:13:30,+20m 2.19
> >>> 5170.005 2019-06-25_07:51:00,+20m 2.09
> >>> 8270.005 2019-06-25_07:23:00,+25m 1.85
> >>> end of the official part.
> >>>
> >>> BTW, since a few days, the VLF RX site at DL0AO has a 3 axis VLF
> >>> receiver recording data from a Octo-soundcard and a Raspberry pi 3,
> >>> saving data to a 4 TB HDD so there is one more station that won't miss
> >>> anything from now on (for example unannounced transmissions by SAQ).
> >>>
> >>> Some spectrograms may be shown later.
> >>>
> >>> Evetually there was a problem with the sample rate correction due 
> to the
> >>> upheating car, which caused a high deviation of the tracked sample 
> rate.
> >>> The max allowed range of 10 ppm was left in the end of the experiment
> >>> but this was noticed a bit late, maybe.
> >>>
> >>> 73, Stefan
> -- 
> 73!
> Roman, RW3ADB
>
>
>