Re: VLF: 8970 Hz transmissions, soon again here

[Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>]

Steinar, Halldor, VLF,

Yes, that's true. I already included a frequency lock to DHO38 in that usr file. Maybe worth to check of it shows the OK field.

WX looks a bit unstable here, overcast! But the web says there will be no rain. I will start now preparing the setup which is much less effort than on a /p activity of course :-) And i have internet during the test :-)

73, Stefan


Am 25.11.2011 22:22, schrieb Halldór:

 

Steinar

 

When starting my grabber Stefan and Chris thought me some tricks:

 

“and use the sample rate detector to lock your sound card to a stable signal”

 

That helps if you are using the 60000 window.

 

73

Halldór

TF3HZ

 

From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Stefan Schäfer
Sent: 25. nóvember 2011 20:33
To: rsgb_lf_group@blacksheep.org
Subject: Re: VLF: 8970 Hz transmissions, soon again here

 

Steinar,

600 s/pix. is a good start point for tmw but i would suggest to use a even narrower FFT bin width like 424 uHz. Also a well configured noise blanker can easily help to get another 6 dB S/N as we have seen in the past.

I attach you a "DFCW-6000.usr" which you can load into SpecLab. This was used successfully in many last experiments on many grabbers :-)

Not you have to wait some 10 minutes until the first pixel appears so do not wonder ;-)

73, Stefan/DK7FC

Am 25.11.2011 20:49, schrieb Steinar Aanesland:

Stefan

I had plans to use  600 sec/step 1mHz res. you will find  under "quick settings/Slow Morse(..)" in SpecLab, but f you have a better solution, I will be happy to try it.

la5vna S



Den 25.11.2011 20:26, skrev Stefan Schäfer:
> Thanks Steinar,
>
> But it will be a first pre-test, i may not get the maximum strength that i want but we'll see.
>
> How do you receive 8970 Hz on the software side? Do you have a "DFCW-6000.usr" for the SpecLab settings or how did you configure the software (which?)?
>
> 73, Stefan
>
> Am 25.11.2011 20:18, schrieb Steinar Aanesland:
>>
>> I will try to capture you Stefan , but I am afraid I got too much noise here to get a good result :(
>>
>> LA5VNA S
>>
>>
>>