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Re: VLF: Long time transmission on earth antenna

To: [email protected]
Subject: Re: VLF: Long time transmission on earth antenna
From: Stefan Schäfer <[email protected]>
Date: Fri, 19 Nov 2010 19:32:42 +0100
Cc: Paul <[email protected]>, Bernd Grupe <[email protected]>
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]> <[email protected]>
Reply-to: [email protected]
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Hi Gary, VLF,

OK, nothing received this time, not even by Paul Nicholson. A pity. But it was shown that Micheal Oexner clearly received the signal at 250W in DFCW-600 (before some weeks) so it must have been about 10 dB stronger at 100W and 141 µHz. So there must have been other reasons why there was no reception. Maybe the wet soil is still a disadvantage or the QRM was just to high.
I will not give up on the earth antenna but maybe it makes more sense to try more power and a faster mode in shorter distances first. Maybe i will arrange a RX at my parents QTH in 36 km distance...

Its time to make an new kite experiment. If the wind will be fine, i will do it next weekend. Before i want to arrange a 3rd tap on the coil for 300m @ 8970 Hz. And i am highly interested to drive this antenna on 137 kHz :-)

Thanks to all for taking part at the yesterdays test and building up RX and Grabbers! :-)

73, Stefan/DK7FC

PS: After the test, the PA, SMPS, netbook, car, antenna and the forest is well up! Batteries were discharged to 9 V ;-)



Am 19.11.2010 16:32, schrieb Gary - G4WGT:
Hello Stefan,

Nothing here up to the sound card crashing about midnight.

73

Gary - G4WGT


On 19 November 2010 11:03, "Jean-Pierre Méré (F1AFJ)" <[email protected]> wrote:
Hi Stefan ,

Nothing here ! I listening 20:00 to 07:00 today

73 Jean-Pierre f1afj

Le 19/11/2010 11:50, [email protected] a écrit :

Not a trace Stefan,sorry,

73
Victor

-----Oorspronkelijk bericht-----
Van: [email protected]
[mailto:[email protected]]Namens Stefan Schäfer
Verzonden: vrijdag 19 november 2010 10:15
Aan: [email protected]
CC: Paul; Bernd Grupe
Onderwerp: Re: VLF: Long time transmission on earth antenna


Dear VLF,

It seems these batteries are not in best condition. The carrier got
weaker and weaker in the morning and disappeared arround 5 UTC.

The SMPS that drives the PA is designed to generate its own 15 V supply
once it started to run. But if the input voltage falls below 10V (or 9)
it shuts down. Seems that this has happend... The batteries have>  300
Ah in sum so it should have been no problem, actually...

I assume no one except me has detected anything?

BTW: The starting time was 15:30 UTC so the DFCW shift appeared at 23:30 UTC

73, Stefan/DK7FC



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