From: Roman <rw3adb@yandex.ru>
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <5CB4404E.1070405@posteo.de>
References: <1115219056.3583883.1555284806139.ref@mail.yahoo.com> <1115219056.3583883.1555284806139@mail.yahoo.com> <5CB4404E.1070405@posteo.de>
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Date: Mon, 15 Apr 2019 13:05:59 +0300
Message-Id: <9279541555322759@myt5-96980ae04900.qloud-c.yandex.net>
Subject: Re: ULF: Very compact ant for VLF 
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Hello LFers!

http://forums.qrz.com/index.php?threads/novel-compact-antenna-for-vlf.654054/

https://phys.org/news/2019-04-slac-compact-antenna-radios.html

73!
Roman

> 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
>> <selberdenken@posteo.de>
>>
>> An: rsgb_lf_group
>> <rsgb_lf_group@blacksheep.org>; Renato Romero
>> <contact@vlf.it>
>>
>> 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: 16
>>
>> 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: 16
>>
>> 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
-- 
73!
Roman, RW3ADB