Re: LF: Coherent BPSK on LF using EbNaut

[Markus Vester <markusvester@aol.com>]

Hi Domenico, Paul,

 

good decode again from the first transmission which started accurately at 20:00 UT. I only noticed that I had to reduce the frequency offset by half a milliHz compared to earlier tests.

 

Best 73,

Markus (DF6NM)

 

-----Ursprüngliche Mitteilung-----
Von: IZ7SLZ <iz7slz.domenico@gmail.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Fr, 23 Okt 2015 9:47 pm
Betreff: Re: LF: Coherent BPSK on LF using EbNaut
 

Good evening Paul, Markus and all, 

  

 

thank you for your updates. 

I will start some EbNaut transmission at 22.00 each hour and hope that  

 Paul can make some measurement on my signal . Qrg is 137502.24 Hz 

Initial trasmission at 22.00 will contains 22 characters at 1 s/symbol  

 and will be sent with 100 W power output. 

Following transmissions will contains 6 characters at 3 s/symbol and  

 should be sent with 10 W. 

 Coding scheme: 8K19A. 

 

 

 GL. 

73, Domenico / iz7slz 

  

  

  

 

On 10/23/2015 7:00 PM, Paul Nicholson wrote: 

 > 

 > I have an E-field rx running on the 137 kHz band, 

 > GPS locked. 

 > 

 > Here is the 'first light' spectrogram 

 > 

 >  http://abelian.org/tmp/lf151023a.png 

 > 

 > which covers 137 kHz to 138.5 kHz. 

 > 

 > It's a bit shaky, everything held together with 

 > croc clips but hopefully will survive long enough 

 > to pick up an amateur signal or two. 

 > 

 > I'm recording 135 to 138.5 kHz.   I reckon the battery 

 > is good for about 60 hours. 

 > 

 > Maybe there will be some distant unmodulated carriers 

 > to measure, or even a coherent BPSK message. 

 > 

 > 137.5 kHz looks quiet here. 

 > 

 > --  

 > Paul Nicholson, 

 > Todmorden, UK. 

 > --  

 > 

 > 

  

  

 

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