Message-ID: <4F9EA932.5090809@iup.uni-heidelberg.de>
Date: Mon, 30 Apr 2012 17:01:06 +0200
From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: RE: 137 kHz SWL report from a tube Audion
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Hello Mike, LF,

Nice to hear from you here, the first time for me i think.
Many thanks for the report, also to Terry/GW0EZY. Which receiver do you=20
use and which CW filter did you choose? How long are you member of the=20
reflector and what have you done on 137 so far, or what do you plan?

I'm also impressed by the signal here in 200km distance. I just took a=20
walk in the forest and made a recording and took some captures. From=20
this location you can see the Netbook, RX and ferrite antenna=20
http://dl.dropbox.com/u/19882028/LF/FerriteantennaintheforestJO41.jpg
It's very comfortable to have a complete LF receive system in a bagpack,=20
leight weight and sensitive. It does not need a ground and does not need=20
to be highly lifted above he ground. Trees are no problem.
DCF39 is 90 dB S/N in 1 Hz NBW,=20
http://dl.dropbox.com/u/19882028/LF/DCF39aus%20dem%20Sauerland.png (when=20
the antenna points to DCF)
My own signal is strongest when the loop just cancels out DCF, it is 50=20
dB S/N in 1 Hz then,=20
http://dl.dropbox.com/u/19882028/LF/DK7FCaus%20dem%20Sauerland.png I'm=20
however not sure if the signal peak level is correct due to the keyed=20
signal...

Unfortunately there were no other LF amateur signals on the band...

73, Stefan/DK7FC




Am 30.04.2012 14:17, schrieb Mike:
> Hi Stefan
> You have provided me with my first amateur signal on 136 you
> are 559 now
> 1216utc IO90MS09 South Coast England. Perfect copy with a
> 10m vertical.
> 73 de Mike G3JVL
>
> -----Original Message-----
> From: owner-rsgb_lf_group@blacksheep.org
> [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of
> Stefan Sch=E4fer
> Sent: 30 April 2012 11:29
> To: rsgb_lf_group@blacksheep.org
> Subject: LF: 137 kHz SWL report from a tube Audion
>
>
> Hello group,
>
> Since yesterday in the afternoon, i'm running a CW beacon
> again at 137.0
> kHz. Speed is about 25 BPM i guess.
> It was intended to generate a test signal for my antenna
> tests here in
> the holiday camp in JO41.
> After seeing two interesting spots in the DX cluster (
> http://www.dxsummit.fi/CustomFilter.aspx?customCount=3D50&cust
> omRange=3D137
> ) i decided to run it some days longer, knowing that many LF
> listeners
> can cross the way (=3Dspectrum) and note that there is
> something going on
> in the LF amateur band.
>
> This time i got a mail from Horst/DL2SAV near Stuttgart
> (JN48 i think).
> He gave me a very interesting report. He is using no amateur
> radio to
> receive LF but an old tube radio from the 60's
> (Schaub-Lorenz) and a
> homemade tube Audion. He tells that DCF39 seems to work as
> the BFO, so
> he can hear me in normal AM mode, like a NDB. Today he sent
> me 3
> recordings which sound very fascinating for me. If you want
> to listen,
> here the link:
> http://dl.dropbox.com/u/19882028/LF/DK7FC_137kHz_30Apr12_amT
> ag_mit_Audion.mp3
> http://dl.dropbox.com/u/19882028/LF/Dk7FC_137kHz_30Apr_12_mi
> t_Radio_Schaub_Lorenz.mp3
> http://dl.dropbox.com/u/19882028/LF/DK7FC_137kHz_30_Apr_112_
> mit_Audiion.mp3
>
> What i don't understand: If DCF39 is the BFO and i am
> transmitting at
> 137.0, then the CW sidetone should be 1830 Hz (LSB,
> 138.83-137.0)? But
> the tone from the Audion sounds rather like 800 Hz for me.
> Maybe someone
> has an explanation.
>
> BTW the beacon is stilll on the air...
>
> 73, Stefan/DK7FC
>
>
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>
>   =20