LF: 0...36 kHz recording, 4 hours from a quiet location

To:	[email protected]
Subject:	LF: 0...36 kHz recording, 4 hours from a quiet location
From:	Stefan Schäfer <[email protected]>
Date:	Mon, 02 Apr 2012 20:22:41 +0200
In-reply-to:	<204158566A164D98BA02A36F656764DE@acer>
References:	<204158566A164D98BA02A36F656764DE@acer>
Reply-to:	[email protected]
Sender:	[email protected]
User-agent:	Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3

Hi Henny, VLF

Thanks for your transmission.
It was a nice day and i took a 4 hour recording during climbing on trees, sleeping and eating in a hammok :-)
Right now i'm running various reprocessings and hope to find your signal out of the noise. I will post screenshots of the complete session later.

If someone wants to play with the recording wav file, it is available at http://dl.dropbox.com/u/19882028/LF/audio/EfieldSteinbruchOhne5k6ExtAkku.WAV for a while. It is a 1.95 GB file sampled at 72 k/s.

I switched a 1 MOhm resistor in series to the 5k6 resistor of my active receive antenna. The 5k6 resistor should form a high pass with the 10 nF capacitor in the circuit (http://www.iup.uni-heidelberg.de/schaefer_vlf/8,97kHz%20active%20E%20field%20antenna%20by%20DK7FC.jpg) By adding the 1 MOhm resistor in series it was clearly seen that the lower cut off frequency dropped to < 1 kHz. The highpass was intended to reduce mains hum and all the stuff below 4 kHz but there in the forest, this is no problem :-)

73, Stefan/DK7FC

PS: On my VLF grabber in the city i see a trace at 8970.002 Hz, maybe this was DF6NM transmitting a test signal too?

Am 02.04.2012 10:11, schrieb henny van elst:

Gm Stefan,lf

the tx is on,8.970 Khz

henny cpm

73's

<Prev in Thread]	Current Thread	[Next in Thread>
LF: 8.970Khz, henny van elst Re: LF: 8.970Khz, Stefan Schäfer Re: LF: 8.970Khz, henny van elst Re: LF: 8.970Khz, Stefan Schäfer LF: 8.970khz, henny van elst LF: 8.970khz, henny van elst LF: Re: 8.970khz, PA1SDB, Peter LF: 0...36 kHz recording, 4 hours from a quiet location, Stefan Schäfer <= VLF: 8970.002, Markus Vester Re: LF: 0...36 kHz recording, 4 hours from a quiet location, Stefan Schäfer Re: LF: 8.970khz, Mike Dennison Re: LF: 8.970khz, henny van elst LF: 8.970Khz, henny van elst LF: 8.970Khz, henny van elst LF: 8.970khz, henny van elst LF: 8.970Khz, henny van elst LF: 8.970khz, henny van elst LF: 8.970khz, henny van elst

Previous by Date:	LF: Re: LF: Re: LF: Fwd: rtl-sdr – OsmoSDR, John Rabson
Next by Date:	VLF: 8970.002, Markus Vester
Previous by Thread:	LF: Re: 8.970khz, PA1SDB, Peter
Next by Thread:	VLF: 8970.002, Markus Vester
Indexes:	[Date] [Thread] [Top] [All Lists]