Message-ID: <4F9E7144.1010307@freenet.de>
Date: Mon, 30 Apr 2012 13:02:28 +0200
From: wolf_dl4yhf <dl4yhf@freenet.de>
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Subject: Re: LF: 137 kHz SWL report from a tube Audion
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Hello Stefan,

Just for curiosity : Where in JO41 are you at the moment ? I'm very 
close to JO41's "northern border" :o)

73 and have a happy holiday,
    Wolf DL4YHF in JO42FD, later for BBQ in JO42FC19hu ...

Am 30.04.2012 12:28, schrieb Stefan Schäfer:
> 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&customRange=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_amTag_mit_Audion.mp3 
>
> http://dl.dropbox.com/u/19882028/LF/Dk7FC_137kHz_30Apr_12_mit_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
>
>
>
>