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Re: VLF: DJ8WX 8270.004 Hz

To: [email protected]
Subject: Re: VLF: DJ8WX 8270.004 Hz
From: wolf_dl4yhf <[email protected]>
Date: Sun, 19 Jan 2014 14:26:17 +0100
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Hi Uwe,

umm..  "PPS zero-crossing too flat" was mumbo-jumbo from the software debugging phase.
The reason may just be as simple as "there was no pulse-per-second sync signal from the GPS" at all.

I have similar trouble here every now and then, because the GPS receiver ('mouse' by Garmin) is sitting on a window ledge;
and even though I don't have a cat, I can imagine what has happened in your case ;-)

Cheers,
  Wolf .


Am 19.01.2014 12:49, schrieb [email protected]:

Hi Peter,

There has been chaos around 0200utc:

2014-01-19 02:00:12  PPS zero-crossing too flat

2014-01-19 02:00:12  Timestamp didn't pass plausibility check !

2014-01-19 02:00:13  Timestamp didn't pass plausibility check !

2014-01-19 02:00:22  PPS zero-crossing too flat

2014-01-19 02:00:22  Timestamp didn't pass plausibility check !

2014-01-19 02:00:23  PPS zero-crossing too flat

2014-01-19 02:00:23  Timestamp didn't pass plausibility check !

2014-01-19 02:00:24  PPS zero-crossing too flat

2014-01-19 02:00:24  Last sync too old (delta=3.08 s) !

2014-01-19 02:00:24  Last sync too old (delta=3.42 s) !

2014-01-19 02:00:25  PPS zero-crossing too flat

2014-01-19 02:00:26  Timestamp didn't pass plausibility check !

2014-01-19 02:00:29  PPS zero-crossing too flat

2014-01-19 02:00:29  Timestamp didn't pass plausibility check !

2014-01-19 02:00:30  PPS zero-crossing too flat

2014-01-19 02:00:31  PPS zero-crossing too flat

2014-01-19 02:00:31  Timestamp didn't pass plausibility check !

2014-01-19 02:00:31  Last sync too old (delta=3.25 s) !

2014-01-19 02:00:32  PPS zero-crossing too flat

2014-01-19 02:00:32  Last sync too old (delta=4.27 s) !

2014-01-19 02:00:33  Timestamp didn't pass plausibility check !

 

I don’t know why. seems most of the satellites where asleep.

 

until coming night

Uwe/dj8wx

 



Von: [email protected]
Gesendet: 19.01.2014 11:01
An: [email protected]
Betreff: Re: VLF: DJ8WX 8270.004 Hz


Hello Uwe, Markus, VLF !
 
 
I just took a "look back in time" in my 2012 and 2013 log's (www.qsl.net/pa1sdb) and I think over the last two years there is a large
rise in signal level when I take a look at DJ8WX his signal. The trace in some saved Spectograms in 2012 and 2013 are not that
impressive as they are right now. 
 
Look at the trace in the spectogram above. Impressive !!!

I have to do research if those "glitches" are at the TX or RX side...
Do you recognise that glitch at about 2 h Uwe ? (in your debug log ?)
I'm not at home this weekend, so I can't tel you the exact time right now.
 
 73's Peter - PA1SDB
 
 
 
 
 
----- Original Message -----
Cc: Paul
Sent: Sunday, January 19, 2014 10:01 AM
Subject: Re: VLF: DJ8WX 8270.004 Hz

Hi Uwe,
 
great signal here, better than ever! On my grabber http://www.df6nm.de/vlf/vlfgrabber.htm it's well visible in 478 uHz, and even traces in the 3.8 mHz "600" window during the early morning hours. The SNR would probably have been sufficient for an Opds-4H detection, but I'm glad you just left the carrier on.
 
I had fixed my frequency offset and you were spot on 8270.004, albeit with occasional transmit phase glitches widening the 42 uHz trace a bit. Sorry about the apparent 0.8 mHz up shift after around 3 UT, it is an artefact caused by a too narrow setting of samplerate tracking tolerance (0.2 ppm).
 
Thanks very much for this test! It's a pity that Mal hadn't left his RX on overnight.
 
Best 73,
Markus (DF6NM)
 

 
Sent: Saturday, January 18, 2014 10:56 PM
Subject: Re: VLF: DJ8WX 8270.004 Hz

Hi Markus,
just now reading your mail. the switch off time was some min after you sent it..
sri for that.
now the TX will stay on the air until tomorrow abt 0900utc.

Hopefully Mal reads this.

GL

Uwe





Von: [email protected]
Gesendet: 17.01.2014 22:36
An: [email protected]
Betreff: VLF: DJ8WX 8270.004 Hz


Uwe is again producing very good traces on the European grabbers. Even in my noisy location I am now getting a nice peak in the 42 uHz FFT (slightly higher due to an uncorrected 0.25 mHz error in my frequency readout).
 
Uwe, do you intend to stay on longer tonight?
 
Best 73,
Markus (DF6NM)
 
 

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