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Re: VLF: 300 mA on 5170 Hz

To: [email protected]
Subject: Re: VLF: 300 mA on 5170 Hz
From: DK7FC <[email protected]>
Date: Tue, 24 Oct 2017 18:55:59 +0200
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]>
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User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3
...the message was running on the 20th, 22th and 23th.

Today i made a mistake in the SpecLab settings which unfortunetely affectet the transmission.
I watched the alternating colours (due to the PSK) and saw that it doesn't switch the phase as expected. Then i quickly restartet SpecLab, it was bit chaotic but now it should work again. Since the symbol length is 3 minutes it was easy to delete the first 11 symbols and start this special file at 16:33:00 UTC. All in all just the first 8 symbols are affected. 2 of them were transmitted correctly (productive), 2 of them have opposite phase (destructive) and 4 were not transmitted (not really neutral but not so dramatic).
Fortunately the transmission takes 12 hours, so 24 minutes is just 3.3 % or -0.15 dB.
The transmimission should now continue as expected.
Just a note for those who follow it...

73, Stefan


Am 20.10.2017 16:11, schrieb DK7FC:

f = 5170.1000 Hz
Start time: 20.October.2017  16:00:00 UTC (daily)
Symbol period: 180 s
Characters: 1
CRC bits: 6
Coding 8K19A
Duration: 12h
Antenna current: 300 mA


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