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Re: VLF: New EbNaut announcement II

To: [email protected]
Subject: Re: VLF: New EbNaut announcement II
From: DK7FC <[email protected]>
Date: Thu, 23 Feb 2017 19:17:31 +0100
In-reply-to: <[email protected]>
References: <CAGZ2MyYDKx5B6HSg1Z7XeoWZigvDgVS8XLT82A1aXW6ogFxFqg@mail.gmail.com> <CAGZ2MyYvXEd4AoA2Evx+DDiCXJLMtcFvuE==LTxg=dEt4xXSww@mail.gmail.com> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <5F78A5280BA3412B9829C1E042E77593@AGB> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]>
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Hmm, i just see that 18*3600/27=2400, so it should have started at 18:00:00 exactly. Odd. But we will see, maybe you have to play a bit with the time offset +- a few seconds...

73, Stefan

Am 23.02.2017 19:11, schrieb DK7FC:
VLF,

Again, despite the stormy wx:

f = 8270.100000 Hz
Start time: 23.Feb.2017   17:59:58 UTC
Symbol period: 27 s
Characters: 10
CRC bits: 15
Coding 16K21A
Duration: 11h, 24m, 0s
Antenna current: 700 mA


Already running. Due to the 27s symbol length it was not possible to start at 18:00:00 exactly. I checked the actual start on another PC. A carrier was started 5 minutes before. The first phase switch appeared 2 seconds before the intended time, see attachment...

10 characters at 16K21A is the limit for my PC (Win7 32-bit 4 GB RAM). I hope that yours is more modern. At least i know it from Paul, Jacek and Alex :-)

For safety reasons i set the safety limit to 20 mA, i.e. the transmission will be stopped if the antenna current falls below 680 mA for 3 seconds.

73, Stefan
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