Re: VLF: 5170.0025 Hz

[Markus Vester <markusvester@aol.com>]

Yesterday the carrier was on until 20:30 UT, but completely invisible in Heidelberg during the evening. This morning I transmitted a couple of hours more (08:23 to 10:30, 0.19 A), leaving a a nice trace again.

Best 73,
Markus


-----Ursprüngliche Mitteilung-----
Von: Markus Vester <markusvester@aol.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Do, 19. Okt 2017 21:37
Betreff: Re: VLF: 5170.0025 Hz

Yes the signal level change was quite drastic. During the early afternoon, some trace was just visible in your 3.8 mHz instance. Now there is even a small sharp peak in Cumiana. Unfortunately at DL0AO, all computers have stalled at 15:30 UT.

Best 73,
Markus


-----Ursprüngliche Mitteilung-----
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Do, 19. Okt 2017 19:07
Betreff: Re: VLF: 5170.0025 Hz

...oh, indeed. I thought you already stopped transmitting but now i see on the DL0AO grabber that you are still on the air! Quite a difference between 12 and 16 UTC, 8...10 dB i estimate.
I'm now starting to wind the last bucket for the new coil and may join in later...
Good to have these grabbers available all the time, luxurious!

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 <markusvester@aol.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
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)