Re: VLF: DJ8WX 8270.004 Hz

["PA1SDB, Peter" <pa1sdb@amsat.org>]

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

 

www.qsl.net/pa1sdb

 

 

 

 

----- Original Message -----

From: Markus Vester

To: rsgb_lf_group@blacksheep.org

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)

 

 

From: uwe-jannsen@kabelmail.de

Sent: Saturday, January 18, 2014 10:56 PM

To: rsgb_lf_group@blacksheep.org

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: rsgb_lf_group@blacksheep.org
Gesendet: 17.01.2014 22:36
An: rsgb_lf_group@blacksheep.org
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)