Новости LF/VLF/ULF/SLF/ELF > VLF (ОНЧ — очень низкие частоты) диапазон с частотами от 3 до 30 кГц
VLF: New DK7FC experiments on 17.47 kHz - Антенна из дорожного отбойника
rw3adb:
Стефан провел новый эксперимент ни 17.47 кГц.
Результты обнадеживают - сигнал принят с большим уровнем на расстоянии 881 км! Возвожна связь и передача сообщений в обычном режиме QRSS-60.
VLF: New experiments on 17.47 kHz planned...
Когда: 20 авг. в 17:29
Hi VLF,
For this week, i'm planning to start with new experiments on 17.47 kHz,
where i have a (renewed) special permission to transmit.
So far the best results were a prooved carrier detection as well as a 1
character EbNaut decode by Edgar from Tasmania (VK7).
The first goal will be to determine the best time (start time and
length) on the path for this season. We have a usable path for about 2
months centered on our autun/spring time (21st SEP).
The Signal will be exported by SpecLab to simple txt files containing
the FFT data. This allows stacking, which will be required to get some
S/N at all. A reasonable stable path is essential during the
transmission time. All this will be determined by running some carrier
transmissions, a few hours per day, starting about 16 UTC.
When knowing the time to try we will attempt to transfer a 2 character
message and then even longer messages. 5 characters would be realistic i
think, with some luck and good propagation and low QRN on the RX site...
More soon.
73, Stefan
VLF: New experiments on 17.47 kHz planned...
Когда: 23 авг. в 10:41
Thanks Paul.
That would be good for the traditional QRSS-60 over our distance. Not
bad at all for such a noisy summer!
73, Stefan
Am 23.08.2018 06:43, schrieb Paul Nicholson:
Свернуть
> Reports welcome :-)
A great signal in Todmorden, 881km.
http://abelian.org/vlf/tmp/180823a.gif
About 22dB S/N in 278uHz, about -14dB in 1Hz.
--
Paul Nicholson
Сергей UB1APE:
Ё! Пойду в сарай найду макет уся на TDA7294.
Сергей UB1APE:
Нашёл. Теперь БП надо восстановить.
rw3adb:
С этой же антенной Стефан передавал DFCW-90 на 8270 Гц
Hi VLF,
Along with some carrier transmissions i run some good old DFCW-90 on my
900m ground loop. At 1.8 A antenna current i easyly saw the signal in a
QRSS/DFCW-60 spectrogram (22 mHz, 10 sec scroll rate), spectrogram
attached. Like on LF, the QRN increased at midday.
For this frequency it is a distance of > 1 wavelength. A short carrier
transmission running earlier showed 28.5 dB S/N in 2.8 mHz.
73, Stefan
rw3adb:
Стефан пишет, что собирается использовать эту антену на 137 кгц!
Hello Genosse Roman,
Yes, i used the ground loop also on 2970 Hz (and on 2470 Hz and 1970
Hz). On sunday i also run a 2 hour long carrier on 1570 Hz starting
08:08 UTC. The post-processing is running. I will report later. Next i
will try 970 Hz but also 137 kHz!
73, GL, Stefan
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