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Date: Thu, 25 Feb 2010 16:39:09 +0100
Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1B1C@File-Server-HST.hst.e-technik.tu-darmstadt.de>
Thread-Topic: Re: VLF test signals?
Thread-Index: Acq2GAKP2CdTE7DMT5+KOd0EMCpsMAAF88Wi
References: <001c01cab575$6bbb0460$0401a8c0@xphd97xgq27nyf> <20100225094846.EA85531E702@smtps01.kuleuven.be> <38A51B74B884D74083D7950AD0DD85E82A1B19@File-Server-HST.hst.e-technik.tu-darmstadt.de> <38A51B74B884D74083D7950AD0DD85E82A1B1B@File-Server-HST.hst.e-technik.tu-darmstadt.de> <001d01cab617$43e9f6b0$8d01a8c0@JAYDELL>
From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@hst.tu-darmstadt.de>
To: <rsgb_lf_group@blacksheep.org>
Content-Type: multipart/mixed;
	boundary="----_=_NextPart_001_01CAB630.AC2521EC"
Subject: LF: AW: Re: VLF test signals?
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


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Tnx Jay, Uwe, Jean-Louis, group,=20

Jay, that sounds to be a good RX concept. You do not have a band pass filt=
er in the preamp? What about the 50Hz or 60Hz ;-) lines and the levels the=
y generate at your RX imput? No problem? Well decoupled by the transformer=
? Sounds easy and at once to be built...=20

On that VLF SDR, the russian transmitter at 11,904kHz is really weak to co=
py :-(

73, Stefan=20

________________________________

Von: owner-rsgb_lf_group@blacksheep.org im Auftrag von jrusgrove@comcast.n=
et
Gesendet: Do 25.02.2010 13:37
An: rsgb_lf_group@blacksheep.org
Betreff: LF: Re: VLF test signals?



Stephan

>Which commercial VLF transmitters can actually be received in the 10kHz=
 range?

The Alpha stations on 11.9, 12.7 and 14.9 kHz are visible (cw speed waterf=
all) and audible here a
good percentage of the time. Receiving setup is 1 meter e probe (J310 vers=
ion of the Amrad e probe,
battery powered and transformer decoupled) to a Perseus SDR receiver.

Jay W1VD  WD2XNS  WE2XGR/2




----- Original Message -----
From: "Stefan Sch=E4fer" <schaefer@hst.tu-darmstadt.de>
To: <rsgb_lf_group@blacksheep.org>
Sent: Thursday, February 25, 2010 6:58 AM
Subject: LF: VLF test signals?


Which commercial VLF transmitters can actually be received in the 10kHz ra=
nge? There is much listed
in the web but in times where these transmitters are shut down all this ma=
y be already old stuff.
Who is receiving in this frequency region and can tell us a frequency and=
 the SNR he is achieving?
There are so many OMs who watch the VLF sector and have nothing done with=
 LF and this group. Perhaps
it it an idea to activate/motivate them for some tests, to increase the RX=
ers density.
Maybe it is good to compare some RX rprts in that region. But i will rathe=
r be active at the
transmitters front now ;-)

Stefan/DK7FC




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