Re: VLF: TA east to west?

[Riccardo Zoli <riccardozoli80@gmail.com>]

Hi Stefan, VLF

Peak looking good in JN64! :-)

FFT 424uHz.

GL, dear Stefan!

All the best

73 de Riccardo IW4DXW

Il 07/Dic/2017 22:18, "DK7FC" <selberdenken@posteo.de> ha scritto:

45 minutes left before the message starts. I can change to CRC 12 but 08:08 UTC means that about the last 90 minutes are running in daylight here.
Let me go to CRC 10, that's 9 hours and 36 minutes. And i'm starting 30 minutes earlier.
If it decodes it won't be the last message anyway. It is then just the beginning! I would then want to pass my call over there for example, i.e. 5+ nights of stacking...
So:
f = 17470.1000 Hz
Start time: 07.Dec.2017  21:30:00 UTC
Symbol period: 60 s
Characters: 1
CRC bits: 10
Coding 16K21A
Duration: 09:36 [hh:mm]
Antenna current: 1 A

73, Stefan


Am 07.12.2017 22:01, schrieb Paul Nicholson:

Stefan wrote:

> Today i'd like to try that first east to west VLF TA
> transmission. Let's try:

> f = 17470.1000 Hz
> Start time: 07.Dec.2017  22:00:00 UTC
> Symbol period: 60 s
> Characters: 1
> CRC bits: 6
> Coding 16K21A

That may decode in one attempt if lucky, but likely two
transmissions will be needed.  If it does decode, then
the chance of it being the correct decode from random
noise is 0.02 %.

Can you run until 08:08 UT with CRC 12 and the other
settings the same?  A gain of 0.74 dB which will make
a good difference.  And if it decodes, the chance of
a random correct decode is only 0.0004 %.

I hope the weather doesn't spoil the transmission, but
if you keep trying, you are sure to succeed.

--
Paul Nicholson
--

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