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Re: LF: Daytime MF prpagation beyond the groundwave

from [Markus Vester] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: Daytime MF prpagation beyond the groundwave
From: Markus Vester <[email protected]>
Date: Sun, 4 Dec 2016 07:09:05 -0500
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In-reply-to: <5B755D6CF04B4A078DCE546208708565@PCPMF>
Reply-to: [email protected]
Sender: [email protected]
Hi Andy, Stefan,

daytime propagation on VLF/LF beyond a few100 km (and likely also on MF) is dominated by ionospheric reflections, rather than groundwave. Despite lower solar elevation on winter days, the ionisation is actually stronger than in summer. This effect is known as the "winter anomaly": https://en.wikipedia.org/wiki/Ionosphere .  

Best 73,
Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: F6CNI - Andy - JN19QB <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: So, 4 Dez 2016 12:30 pm
Betreff: Re: LF: Daytime MF prpagation beyond the groundwave

Hello Stefan. Sorry but I do not understand.
 
Can you explain to us scientifically why
you said that there is a difference enter winter and summer for day time groundwave mode of propagation ?
 
Also, an other question : can you tell us honestly which is your exact EIRP transmitting power, because on day time groundwave there is not usual to have a WSPR2 report on the 630 meters band of –17 dB S/N over 1500 km (Remember that he legal maximum power in DK is 1 Watt EIRP, and nobody can ignore the law ).
 
73 Andy.
 
 
From: DK7FC
Sent: Sunday, December 4, 2016 11:52 AM
Subject: LF: Daytime MF prpagation beyond the groundwave
 
Hi MF,

I just sent a single WSPR block and got the following results from distances above 300km.
 This is typical for the winter season.

73, Stefan

27 spots:

Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km az
2016-12-04 10:46 DK7FC 0.475682 -20 0 JN49ik 1 LA2XPA JP33wi 1548 358
2016-12-04 10:46 DK7FC 0.475685 -17 0 JN49ik 1 OH1TSM KP11db 1546 28
2016-12-04 10:46 DK7FC 0.475682 -6 0 JN49ik 1 LA8AV JO59cs 1153 4
2016-12-04 10:46 DK7FC 0.475682 -12 0 JN49ik 1 LA6LU JO59eq 1145 5
2016-12-04 10:46 DK7FC 0.475682 +2 0 JN49ik 1 LA3EQ JO28xj 1012 351
2016-12-04 10:46 DK7FC 0.475682 -19 0 JN49ik 1 G3XKR IO70ux 940 285
2016-12-04 10:46 DK7FC 0.475682 -19 0 JN49ik 1 SP5XSB KO02ld 911 66
2016-12-04 10:46 DK7FC 0.475683 -6 0 JN49ik 1 G8HUH IO81mg 851 288
2016-12-04 10:46 DK7FC 0.475674 -19 0 JN49ik 1 M0FMT IO91ux 693 297
2016-12-04 10:46 DK7FC 0.475622 -12 0 JN49ik 1 G0VQH JO02fe 655 301
2016-12-04 10:46 DK7FC 0.475682 -23 0 JN49ik 1 IW4DXW JN64bw 563 151
2016-12-04 10:46 DK7FC 0.475684 +1 0 JN49ik 1 PA0RDT JO11tm 428 305
2016-12-04 10:46 DK7FC 0.475686 -8 0 JN49ik 1 PA7EY JO22jj 428 322
2016-12-04 10:46 DK7FC 0.475682 -4 0 JN49ik 1 PE1RKT JO22fb 418 316
2016-12-04 10:46 DK7FC 0.475684 -15 0 JN49ik 1 PA3ANG JO32am 390 332
2016-12-04 10:46 DK7FC 0.475686 -12 0 JN49ik 1 DL-SWL JO52hp 381 20
2016-12-04 10:46 DK7FC 0.475681 +12 0 JN49ik 1 DH5RAE JN68qv 345 98
2016-12-04 10:46 DK7FC 0.475682 +1 0 JN49ik 1 PI4THT JO32kf 336 338
2016-12-04 10:46 DK7FC 0.475682 -12 0 JN49ik 1 PA0MLC JO31aw 335 327
2016-12-04 10:46 DK7FC 0.475682 +7 0 JN49ik 1 DJ0ABR JN68nt 329 101



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