Message-ID: <4FE8F02F.2030304@iup.uni-heidelberg.de>
Date: Tue, 26 Jun 2012 01:11:43 +0200
From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: Re: New VLF Grabber in Darmstadt
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Yes, in any way it would be nice again to put some focus on VLF. It's a=20
long time ago i regularly monitored my own VLF grabber=20
(http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html).

Looks like SAQ has tuned up today for a time arround 10 UTC. The Alphas=20
are OFF again and the noise is maybe 10 dB higher than in winther, as a=20
maximum. I do not change the brightness between summer and winther.

Opera 4 H, what the hell is that?

How long does it take to get a full decode in that mode and what is the=20
content of the decoded message? If 4 H means 4 hours and the content is=20
a full callsign and locator (about like in WOLF) then maybe it can be=20
compared with DFCW-120? If so, i guess the range of a 1 mW ERP station=20
will be below 100 km, if conds are good (i.e. no QRN and during the gap=20
in the morning which is arround 8...11 UTC) and the RX is is typical.

We know that no digimode can do miracles. However we often saw stations=20
just transmitting a few dashes. If these dashes will satisfy all, it=20
would be fine.

Due to other projects (ah, i remember, it was the LF DX to VK times) i=20
stopped the local VLF experiments with the LOPT transformer. Also is=20
showed me that there is no real alternative to an air coil if a serious=20
ERP is goal. That was clear in advance but the proof was clearer than i=20
thought.

As i write these lines, a small VLF flame starts to burn again. But=20
there is the MF project on the table as well...

What about all the other VLF transmitting stations? We have been 7=20
(OK2BVG, OE3GHB, DF6NM, G3XIZ, DJ8WX, OE5ODL, PA3CPM, DK7FC) who passed=20
distances above 1 Lambda. Did i forget someone?


73, Stefan/DK7FC


Am 26.06.2012 00:39, schrieb Graham:
> Would  be the  first  with  Opera  4 H decode  over  this  side  of=20
> the  UK as  well !
>
> --------------------------------------------------
> From: "Stefan Sch=E4fer" <Stefan.Schaefer@iup.uni-heidelberg.de>
> Sent: Monday, June 25, 2012 11:20 PM
> To: <rsgb_lf_group@blacksheep.org>
> Subject: Re: LF: Re: New VLF Grabber in Darmstadt
>
>> Mal,
>>
>> Am 25.06.2012 20:08, schrieb mal hamilton:
>>> Stefan
>>> This sounds interesting and given time I might get Transmitting on th=
e
>>> Dreamers band.
>> Yes, give it a try! You know how it is done and need less effort due=20
>> to your higher antenna C and mains availability.
>> You can surely be the first who will be visible in EU from the UK.
>>
>>> I have all the equipment suitable plus antennas but I am busy with=20
>>> other
>>> persuits at present.
>>>
>> Take care and the time to carefully wind a suitable coil on a large=20
>> tube. 60 cm, rather 80 cm diameter is recommended. You have Paul=20
>> Nicholsons grabber in a not to far distance, which will be very=20
>> helpful for the first tests!
>>
>> 73, Stefan
>>
>>
>>> ----- Original Message -----
>>> From: "Stefan Sch=E4fer"<Stefan.Schaefer@iup.uni-heidelberg.de>
>>> To:<rsgb_lf_group@blacksheep.org>
>>> Cc: "Paul"<paul@abelian.netcom.co.uk>; "Christoph Maurer"
>>> <christoph.maurer@skmail.ikp.physik.tu-darmstadt.de>
>>> Sent: Monday, June 25, 2012 1:18 PM
>>> Subject: LF: New VLF Grabber in Darmstadt
>>>
>>>
>>>
>>>> VLF,
>>>>
>>>> It's a long time ago that we put the focus on VLF. Today i want to
>>>> inform you about a new VLF Grabber at the Technical University of
>>>> Darmstadt,=20
>>>> http://skmail.ikp.physik.tu-darmstadt.de/gvw/grabber.html run
>>>> by Christoph Maurer who is working in the nuclear science institute.
>>>> Seems they want to observe the VLF spectrum and try to make some
>>>> earthquake precursors.
>>>> I've been in contact with Christoph some month ago and convinced=20
>>>> him to
>>>> share the received spectrum with us by running such a grabber :-) He
>>>> even runs a "DFCW-6000" window on that site. There are no CPU=20
>>>> resources
>>>> for that at the moment though.
>>>> The distance to Heidelberg is 51.3 km,
>>>> http://no.nonsense.ee/qthmap/?qth=3DJN49HV80ST&from=3Djn49ik00wd so =
it
>>>> should be easy to get a reception on 8970 Hz (Dreamers band :-) ) ev=
en
>>>> in summer.
>>>> If i find the time in the coming weeks i'm planning a summer VLF=20
>>>> event.
>>>> BTW my special permission to fly a kite in 300m AGL expires in June=20
>>>> 2012
>>>> :-( These days, i'm not sure whether it makes sense to try to=20
>>>> extend it.
>>>>
>>>> 73, Stefan/DK7FC
>>>>
>>>>
>>>
>>