Return to KLUBNL.PL main page

[Top] [All Lists]

Re: ULF: Ground loop night transmission 3.0

To: [email protected]
Subject: Re: ULF: Ground loop night transmission 3.0
From: DK7FC <[email protected]>
Date: Mon, 15 Apr 2019 10:26:54 +0200
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/simple;; s=2017; t=1555316833; bh=wQDp7+7oMOMBATdtsByu/D9erkt9lUXU8yKmJWTF8c8=; h=Date:From:To:Subject:From; b=MKMIrXJ0Q5MG7is8u2jkN3Ir9tUD921uBD9xJBi2R5YH7jofb/mNvBfqTmj7FCN3b /zFhVrZlin42r9WUZPq2wtmcTJxZG8nkXk4BJdIroWsBlET7Ja3syq7xCRNWAWMCEK v8z1c5znyqXnZUSuqrYDJEMHMl+piUXVRCybDZQzv2iZNV5tf7vFP1iNXP0tltlUor RC7Q4gic2qtMdb5vSJD8YO6mZXo9vqJ/igh5iGF0tKsItyvKGiSiH7aUKZuGYn3FDe 9TNH0b9WIpHks1V963NUG0xgIwPpyA2zScAbYGFplrDrqW5PuLObY3AypMpe3Af8gL UINlAFoeBkvjw==
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv: Gecko/20100227 Thunderbird/3.0.3
Hello Markus, ULF,

Very well. Thanks for your decodes and for sharing the night :-)
Do you have an idea why the E-W cardioid result is worse than from the E field alone?
Which carrier S/N do you get from the E field? I'm getting carrier S/N: 40.62 dB in 128.6 uHz, 1.71 dB in 1Hz
The difference of our carrier Eb/N0 is 16.3 dB. But as Paul mentioned, camparing carrier S/N may be more accurate in that spectrum range.
It could be interesting to compare the SNR difference between our locations over some frequencies. If that value is reasonable constant, in the far field, then we could estimate what we can expect at 970 Hz...
My results from all 3 antennas are still looking good at that frequency:
E field: carrier S/N: 40.62 dB in 128.6 uHz
N-S loop: carrier S/N: 28.38 dB in 128.6 uHz
E-W loop: carrier S/N: 30.47 dB in 128.6 uHz

73, Stefan

Am 15.04.2019 01:33, schrieb Markus Vester:
Hi Stefan,

DL0AO H-field (E-W): Eb/N0 = 2.5 dB(car), 0.7 dB(sym),
DL0AO E-Field: Eb/N0 = 12.0 dB(car), 10.9 dB (sym). 

Our file ended a couple of minutes early with the last 12 symbols missing, causing a slightly high symbol error reading.

73 and good night,
Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: DK7FC <[email protected]>
An: rsgb_lf_group <[email protected]>; Renato Romero <[email protected]>
Verschickt: So, 14. Apr. 2019 23:13
Betreff: Re: ULF: Ground loop night transmission 3.0

Hello ULF friends,

Now i'm sitting in the car again in the deep forest. It is silent (outside!) and the sky is clear. The TX and EbNaut message is now running:

f = 2470.1 Hz
Start time: 14.APR.2019  21:00:00.3 UTC
Symbol period: 9 s
Characters: 3
CRC bits:
Coding 16K21A
Antenna current: 2.5 A
Duration: 02:09:36 [hh:mm:ss]

TX power at the beginning of the transmission is 492 W this time.

73, Stefan

Am 14.04.2019 14:41, schrieb DK7FC:
Hello Dreamers,

Today it feels right again, i'd like to have another exciting adventure...
After the recent successes at 2970 Hz, maybe it is possible to get something through at 2470 Hz? That's the 121 km band. So far, thge distance record at this frequency is over to DL4YHF, QRB ~ 313 km.

I'd like to try the following:

f = 2470.1 Hz
Start time: 14.APR.2019  ab:cd:00.3 UTC
Symbol period: 9 s
Characters: 3
CRC bits:
Coding 16K21A
Antenna current: 2.e A
Duration: 02:09:36 [hh:mm:ss]

More details regarding start time and antenna current will follow after the transmission has started.

Reports requested / welcome :-)

73, Stefan
<Prev in Thread] Current Thread [Next in Thread>