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Re: VLF: 5170.0025 Hz

from [DK7FC] [Permanent Link][Original]
To: [email protected]
Subject: Re: VLF: 5170.0025 Hz
From: DK7FC <[email protected]>
Date: Thu, 19 Oct 2017 18:54:42 +0200
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Markus,

Maybe it is another effect that no one has observed until now: At night, the distance between Heidelberg and Nürnberg seems to be shorter, about 0.5 lambda on 5170 Hz. Genial! :-)

73, Stefan

Am 19.10.2017 18:42, schrieb Markus Vester:
Despite constant transmit antenna current, my signal level on Stefan's grabber dropped very significantly over the hours between midday and evening. This may be the day-night effect again: As the distance between Heidelberg and Nürnberg (178 km) is shorter than Heidelberg to Amberg (230 km), the skywave is steeper and the extra path relative to groundwave is about 20% longer. Thus a similar diurnal effect may now happen at lower frequency.    

Best 73,
Markus

-----Ursprüngliche Mitteilung-----
Von: Markus Vester <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Do, 19. Okt 2017 14:29
Betreff: VLF: 5170.0025 Hz

Since 11:46 UT I'm transmitting a carrier on 5170.0025 Hz, antenna current 0.21 A into approx. 8 m effective height. It looks like nice peaks are building up on the grabbers in Heidelberg and Amberg.

Best 73,
Markus (DF6NM)

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