LF: Re: Re: URGETNT!!!! PLZ REPLY Re: DK7FCs 5th VLF experiment...

["George Vastianos" <george@vastianos.com>]

Thanks Marcus

 

I use the circuit of M0BMU with the bandpass filter of 9 khz...

also the loop resonates on 8.97khz

 

as i understoot the attached file you sent me is used to lock the samplerate with the 19.58 GBZ signal??? if yes  then i dont think it will work.

 

I think its ok to work with your 9kHz_4mHz.usr and leave the pc some hours to run on grabbing before the start of transmissions...  in order to stabilize

 

my sound card is delta-44

 

also i made a batch file upload_vlf.bat (for 9kHz_4mHz.usr) file that has the following code

 

@echo off
echo %DATE% %TIME%
set MTH=%DATE:~4,2%
set DAY=%DATE:~7,2%
set YR=%DATE:~10,4%
set HR=%TIME:~0,2%
set HR0=%TIME:~0,1%
if "%HR0%"==" " set HR=0%TIME:~1,1%
set MIN=%TIME:~3,2%
set SEC=%TIME:~6,2%
set MYDATE=%YR%%MTH%%DAY%-%HR%%MIN%%SEC%
copy vlf.jpg %MYDATE%.jpg

 

the result is to copy each time the vlf.jpg as file with timestamp

eg 20101505-232042.jpg

 

so when I will return back home I will not miss anything

 

73

 

sv8gxc

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

From: Markus Vester

To: rsgb_lf_group@blacksheep.org

Sent: Saturday, May 15, 2010 11:13 PM

Subject: LF: Re: URGETNT!!!! PLZ REPLY Re: DK7FCs 5th VLF experiment...

Dear George,

 

here is a resend of an earlier post. It contains the 0.95 mHz FFT settings currently used for my grabber, with samplerate tracking to GBZ 19.58 kHz.

 

Good luck,

Markus (DF6NM)

 

Original Message -----

From: George Vastianos

To: rsgb_lf_group@blacksheep.org

Sent: Saturday, May 15, 2010 9:11 PM

Subject: LF: URGETNT!!!! PLZ REPLY Re: DK7FCs 5th VLF experiment...

hi stefan

 

iam thinking to setup the loop and receiver tomorrow moring on the roof and leave it unattended to grab.... and leave

 

i will return back home about 5 pm

 

I TESTED SOME CONFIGURATION FILES FOR SPECTRUMLAB ...BUT I DONT THINK I HAVE THE CORRECT FFT SETTINGS

 

CAN YOU PLEASE SEND ME A SETTINGS FILE SUITABLE FOR YOUR TRANSMISSION?????

 

PLEASE ANSWER!!!

 

73

 

SV8GXC  

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

From: Markus Vester

To: rsgb_lf_group@blacksheep.org

Sent: Thursday, April 22, 2010 7:34 PM

Subject: Re: LF: vlf stuff

Dear Laurence, VLF Dreamers,

 

those settings will require some adaptions, regarding samplerate etc. (see posting below). Attached is the current setup of my VLF grabber with 0.95 mHz resolution. 

 

SpecLab 2.75 b08 contains a new samplerate tracking algorithm based on the strong and precise VLF MSK transmitters. It is very easy to set up, and avoids the difficulty to identify the central line in the Alpha spectrum. I am currently tracking GBZ 19.58 kHz here. To use the stateside transmitters (NAA, NML) at 24 kHz and above, you will have to switch from 48 to 96 kHz samplerate.

 

BTW - What is your distance to Paul W1VLF?

 

Kind regards,

MArkus (DF6NM)

 

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

From: Laurence KL1X

To: rsgb_lf_group@blacksheep.org

Sent: Thursday, April 22, 2010 6:56 PM

Subject: RE: LF: vlf stuff

Using Spectrum labs with some new set ups - see attachments - File,  Load settings, then select one of the above youve pasted previously - the other piece of software is the SAQ RX  http://web.telia.com/~u33233109/saqrx/saqrx.html
 
cheers

 

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

From: Markus Vester

To: rsgb_lf_group@blacksheep.org

Sent: Saturday, April 03, 2010 10:03 AM

Subject: VLF: SpecLab settings

Dear Wolfgang, Daniele, LF,

 

thanks Wolfgang for the hint about turning off periodic actions.

 

There are actually three configuration files in

 http://www.mydarc.de/df6nm/vlf/9kHz_Grabber_SpecLab_configurations.zip 

so some explanation is probably on order:

 

-  9kHzWide.usr has 0 to 24 kHz on the top and around 9 kHz at the bottom, with 1.46 Hz FFT resolution and 1 second scrolling. It's meant to give a quick overview of the band, eg. to optimize antenna coupling. You shold see the big MSK signals, and  three lines of tiny dots on the Alpha frequencies. But this setting is too fast to see a weak signal.

 

-  9kHz_slow2_white is the original 15.3 mHz setting, with the 8.97 kHz area at the top and 11.905 at the bottom. It scrolls at 10 seconds, and you can read QRSS 60 or slower keying. Beware there is an offset (0.30 Hz and 0.0397 Hz) on the frequency scales, which I had used to correct for my "white" notebook's samplerate offset. But this will certainly be different on other machines, so I would recommend to reset those offsets to zero, and use the samplerate calibration entry in SpecLab's audio settings tab instead.

 

-  9kHz_4mHz.usr is the one currently displayed on the lower part of my grabber. It has a more sensitive 3.8 mHz FFT and 1 minute scrolling. Again, you should delete the Freq1 and Freq2 offsets and enter your samplerate.

 

Good luck to Stefan and all,

 

Markus

 

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