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Re: VLF: Tonite...

To: [email protected]
Subject: Re: VLF: Tonite...
From: Markus Vester <[email protected]>
Date: Sat, 4 Mar 2017 03:19:45 -0500
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Looks good, the "glitch rate" on wald5 seems to have gone down from 4 .. 6 per hour to less than 1 per hour. Also a  nice peak here in my DCF77-locked 31 uHz instance (attached), as well 477 and 63 uHz on the grabber which are still 1pps locked.

73, Markus

-----Ursprüngliche Mitteilung-----
Von: DK7FC <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Sa, 4. Mrz 2017 1:54
Betreff: Re: VLF: Tonite...

... since 0:35 UTC, a plain carrier is running on 8270.005 Hz. I'm going to run it for the night. Maybe someone can see it on a spectrogram.

The new PC works perfect with the GPS module it seems so far. However the soundcard output is inverting relative to the old one. Not a problem.
I expect to have much less phase glitches now and no interruptions when accessing the PC remotely. This allows me now to make the time constant of the safety function shorter, 1.6 sec in  the moment (3 sec before).
There have been lost transmissions in the attempts to transfer 100 characters on 5170 Hz. Maybe this had to do with the old PC too.
If the signal is more focused on the frequency now, it could be possible to detect other transmitting stations on the tree while transmitting here. Advantages... :-)
So the night transmission is a test of the new system...

73, Stefan

Am 03.03.2017 20:17, schrieb DK7FC:
Thanks Markus, Jacek and Eddie for the decodes.

I'm planning a new message for tonite but still need some time to build up a new PC into the VLF TX system. The old one has 512 MB RAM, the new one has 2 GB which should make a real difference regarding soundcard glitches. Additionally i'm moving from PPS+NTP to PPS+NMEA.

Announcement follows...

73, Stefan

Attachment: vlf_31uHz_dcf77_170304_0736.png
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