From: "Mike" <michael.walters26@ntlworld.com>
To: <rsgb_lf_group@blacksheep.org>
Date: Mon, 30 Apr 2012 13:17:26 +0100
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Subject: LF: RE: 137 kHz SWL report from a tube Audion
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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 Schäfer
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=50&cust
omRange=137
) i decided to run it some days longer, knowing that many LF
listeners
can cross the way (=spectrum) 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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